Krzysztof Wohlfeld (homepage)

Associate professor at the Institute of Theoretical Physics of the Faculty of Physics of the University of Warsaw 

Brief CV:

• 1981: Born in Zakopane 
• 2000: Finished August Witkowski High School (V LO) in Cracow 
• 2000-2009: Studied theoretical physics at the Jagiellonian University (both master and doctoral studies) 
• 2009: Defended my PhD with distinction at the Jagiellonian University under the supervision of prof. Andrzej M. Oles 
• 2009-2012: Spent my first postdoc at IFW Dresden with prof. Jeroen van den Brink partially supported by the Humboldt foundation 
• 2012-2015: Spent my second postdoc at Stanford University with prof. Thomas P. Devereaux 
• 2015-2022: Employed as an assistant professor at the University of Warsaw 
• 2017-2023: "Sonata-Bis" grant of the Polish National Science Centre ("Collective Excitations in Transition Metal Oxides: Unresolved Problems and Novel Properties") 
• 2018: Obtained habilitation degree (with distinction) 
• 2022: Associate professor at the University of Warsaw 

Preprints:

1. T. Kulka, M. Panfil, M. Berciu, K. Wohlfeld, "Nature of spinons in the 1D Heisenberg antiferromagnet"; arxiv (2023).  
2. P. Wrzosek, A. Klosinski, Y. Wang, M. Berciu, C. E. Agrapidis, K. Wohlfeld, "The fate of the spin polaron in the 1D antiferromagnets"; arxiv (2022).  
3. K. Wohlfeld, "Propagation of an orbiton in the antiferromagnets: theory and experimental verification"; arxiv (2019).  

Accepted papers:

1. W. He, Y. Shen, K. Wohlfeld, J. Sears, J. Li, J. Pelliciari, M. Walicki, S. Johnston, E. Baldini, V. Bisogni, M. Mitrano, M. P. M. Dean, "Magnetically propagating Hund's exciton in van der Waals antiferromagnet NiPS3"; to appear in Nat. Comm. (2024); arxiv.  
2. L. Martinelli, K. Wohlfeld, J. Pelliciari, R. Arpaia, N. B. Brookes, D. Di Castro, M. G. Fernandez, M. Kang, Y. Krockenberger, K. Kummer, D. E. McNally, E. Paris, T. Schmitt, H. Yamamoto, A. Walters, K.-J. Zhou, L. Braicovich, R. Comin, M. Moretti Sala, T. P. Devereaux, M. Daghofer, G. Ghiringhelli, "Collective nature of orbital excitations in layered cuprates in the absence of apical oxygens"; Phys. Rev. Lett. 132, 066004 (2024); paper; arxiv.  
3. P. Wrzosek, A. Klosinski, K. Wohlfeld, C. E. Agrapidis, "Rare collapse of fermionic quasiparticles upon coupling to local bosons", Phys. Rev. B 107, 205103 (2023); paper; arxiv.  
4. A. Klosinski, W. Brzezicki, A. Lau, C. E. Agrapidis, A. M. Oles, J. van Wezel, K. Wohlfeld, "Topology of chalcogen chains"; Phys. Rev. B 107, 125123 (2023); paper; arxiv.  
5. J. Wojtkiewicz, K. Wohlfeld, A. M. Oles, "Long-range order in the XY model on the honeycomb lattice"; Phys. Rev. B 107, 064409 (2023); paper; arxiv.  
6. W. Zhang, C. E. Agrapidis, Y. Tseng, T. C. Asmara, E. Paris, V. N. Strocov, E. Giannini, S. Nishimoto, K. Wohlfeld , T. Schmitt, "Unravelling the Nature of Spin Excitations Disentangled from Charge Contributions in a Doped Cuprate Superconductor"; npj Quantum Mater. 7, 123 (2022); paper; arxiv.  
7. C. Autieri, G. Cuono, C.Noce, M. Rybak, K. M. Kotur, C. E. Agrapidis, K. Wohlfeld , M. Birowska, "Limited ferromagnetic interactions in monolayers of MPS3"; J. Phys. Chem. C 126, 6791 (2022); paper; arxiv.  
8. A. Klosinski, A. M. Oles, C. E. Agrapidis, J. van Wezel, K. Wohlfeld, "Chalcogenic orbital density waves in weak and strong coupling limit"; Phys. Rev. B 103, 235123 (2021); paper; arxiv.  
9. J. Li, L. Xu, M. Garcia-Fernandez, A. Nag, H. C. Robarts, A. C. Walters, X. Liu, J. Zhou, K. Wohlfeld, J. van den Brink, H. Ding, and K.-J. Zhou, "Unraveling the Orbital Physics in a Canonical Orbital System KCuF3", Phys. Rev. Lett. 126, 106401 (2021); paper; arxiv. 
10. P. Wrzosek and K. Wohlfeld, "Hole in the 2D Ising Antiferromagnet: Origin of the Incoherent Spectrum", Phys. Rev. B 103, 035113 (2021); paper; arxiv. 
11. Y. Wang, Y. He, K. Wohlfeld, M. Hashimoto, E. W. Huang, D. Lu, S.-K. Mo, S. Komiya, C. J. Jia, B. Moritz, Z.-X. Shen, T. P. Devereaux, "Emergence of Quasiparticle in Doped Mott Insulators"; Commun. Phys. 3, 210 (2020); paper; arxiv. 
12. E. Paris, Y. Tseng, E. M. Paerschke, W. Zhang, M. H. Upton, A. Efimenko, K. Rolfs, D. E. McNally, L. Maurel, M. Naamneh, M. Caputo, V. N. Strocov, Z. Wang, D. Casa, C.W. Schneider, E. Pomjakushina, K. Wohlfeld, M. Radovic, T. Schmitt; "Strain engineering of the charge and spin-orbital interactions in Sr2IrO4"; PNAS 117, 24764 (2020); paper; arxiv. 
13. D. Gotfryd, E. Paerschke, K. Wohlfeld, A. M. Oles, "Evolulion of Spin-Orbital Entanglement with Increasing Ising Spin-Orbit Coupling"; Condens. Matter 5, 53 (2020); paper; arxiv. 
14. M. Rossi, P. Marabotti, Y. Hirata, G. Monaco, M. Krisch, K. Ohgushi, K. Wohlfeld, J. van den Brink, M. Moretti Sala, "A jeff=1/2 pseudospinon continuum in CaIrO3"; The European Physical Journal Plus 135, 676 (2020); paper; arxiv. 
15. O. Sikora, D. Gotfryd, A. Ptok, M. Sternik, K. Wohlfeld, A. M. Oles, and P. Piekarz "Origin of the monoclinic distortion and its impact on the electronic properties in KO2"; Physical Review B 102, 085129 (2020); paper; arxiv. 
16. P. Wrzosek, K. Wohlfeld, T. Sowinski, M. A. Sentef, "Quantum walk versus stone in pond: Distinguishing ground states of quantum magnets by spacetime dynamics"; Physical Review B 102, 02440 (2020); paper; arxiv. 
17. R. Fumagalli, J. Heverhagen, D. Betto, R. Arpaia, M. Rossi, D. Di Castro, N. B. Brookes, M. M. Sala, M. Daghofer, L. Braicovich, K. Wohlfeld, G. Ghiringhelli, "Mobile orbitons in Ca2CuO3: crucial role of the Hund's exchange"; Physical Review B 101, 205117 (2020); paper; arxiv. 
18. D. Gotfryd, E. M. Paerschke, A. M. Oles, K. Wohlfeld, "How spin-orbital entanglement depends on the spin-orbit coupling in a Mott insulator"; Physical Review Research 2, 013353 (2020); paper; arxiv. 
19. A. Klosinski, D. V. Efremov, J. van den Brink, K. Wohlfeld "Photoemission Spectrum of Ca2RuO4: Spin Polaron Physics in an S=1 Antiferromagnet with Anisotropies"; Physical Review B 101, 035115 (2020); paper; arxiv. 
20. K. Bieniasz, P. Wrzosek, A. M. Oles, K. Wohlfeld, "Superexponential Wave Function Decay: A Fingerprint of Strings in Doped Antiferromagnets"; SciPost Physics 7, 066 (2019); paper; arxiv. 
21. A. M. Oles, K. Wohlfeld, G. Khaliullin, "Orbital Symmetry and Orbital Excitations in High-Tc Superconductors"; Condensed Matter 4, 46 (2019); paper; arxiv. 
22. E. M. Paerschke, Y. Wang, B. Moritz, T. P. Devereaux, C.-C. Chen, K. Wohlfeld, "Numerical Investigation of Spin Excitations in a Doped Spin Chain"; Physical Review B 99, 205102 (2019); paper; arxiv. 
23. J. Gawraczynski, D. Kurzydlowski, R. A. Ewings, S. Bandaru, W. Gadomski, Z. Mazej, G. Ruani, I. Bergenti, T. Jaron, A. Ozarowski, S. Hill, P. J. Leszczynski, K. Tokar, M. Derzsi, P. Barone, K. Wohlfeld, J. Lorenzana, W. Grochala, "Silver route to cuprate analogs"; PNAS 116, 1495 (2019); paper; arxiv. 
24. Y. Wang, B. Moritz, C.-C. Chen, T. P. Devereaux, and K. Wohlfeld, "Influence of magnetism and correlation on the spectral properties of doped Mott insulators"; Physical Review B 97, 115120 (2018); paper; arxiv. 
25. Y. F. Kung, C. Bazin, K. Wohlfeld, Yao Wang, C.-C. Chen, C. J. Jia, S. Johnston, B. Moritz, F. Mila, and T. P. Devereaux, "Numerically exploring the 1D-2D dimensional crossover on spin dynamics in the doped Hubbard model"; Physical Review B 96, 195106 (2017); paper; arxiv. 
26. E. M. Paerschke, K. Wohlfeld, K. Foyevtsova, J. van den Brink, "Correlation induced electron-hole asymmetry in quasi-2D iridates"; Nature Communications 8, 686 (2017); paper; arxiv. 
27. M. Rossi, M. Retegan, C. Giacobbe, R. Fumagalli, A. Efimenko, T. Kulka, K. Wohlfeld, A. I. Gubanov, and M. Moretti Sala, "Possibility to realize spin-orbit-induced correlated physics in iridium fluorides"; Phys. Rev. B 95, 235161 (2017); paper; arxiv. 
28. D. Gotfryd, J. Rusnacko, K. Wohlfeld, G. Jackeli, J. Chaloupka, A. M. Oles, "Phase diagram and spin correlations of the Kitaev-Heisenberg model: Importance of quantum effects"; Phys. Rev. B 95, 024426 (2017); paper; arxiv. 
29. T. P. Devereaux, A. M. Shvaika, K. Wu, K. Wohlfeld , C. J. Jia, Y. Wang, B. Moritz, L. Chaix, W.-S. Lee, Z.-X. Shen, G. Ghiringhelli, L. Braicovich, "Directly characterizing the relative strength and momentum dependence of electron-phonon coupling using resonant inelastic x-ray scattering"; Phys. Rev. X 6, 041019 (2016); paper; arxiv. 
30. C. J. Jia, K. Wohlfeld, Y. Wang, B. Moritz, T. P. Devereaux, "Using RIXS to uncover elementary charge and spin excitations in correlated materials"; Phys. Rev. X 6, 021020 (2016); paper; arxiv. 
31. E. M. Plotnikova, M. Daghofer, J. van den Brink, K. Wohlfeld, "Jahn-Teller effect in systems with strong on-site spin-orbit coupling"; Phys. Rev. Lett. 116, 106401 (2016); paper; arxiv. 
32. H. Y. Huang, C. J. Jia, Z. Y. Chen, K. Wohlfeld, B. Moritz, T. P. Devereaux, W. B. Wu, J. Okamoto, W. S. Lee, M. Hashimoto, Y. He, Z. X. Shen, Y. Yoshida, H. Eisaki, C. Y. Mou, C. T. Chen, and D. J. Huang, "Raman and fluorescence characteristics of resonant inelastic X-ray scattering from doped superconducting cuprates"; Scientific Reports 6, 19657 (2016); paper; arxiv 
33. Y. Wang, K. Wohlfeld, B. Moritz, C. J. Jia, M. van Veenendaal, K. Wu, C.-C. Chen, T. P. Devereaux, "Origin of Strong Dispersion in Hubbard Insulators"; Phys. Rev. B 92, 075119 (2015); paper; arxiv. 
34. C. C. Chen, M. van Veenendaal, T. P. Devereaux, K. Wohlfeld, "Fractionalization, entanglement, and separation: understanding the collective excitations in a spin-orbital chain"; Phys. Rev. B 91, 165102 (2015); paper; arxiv. 
35. V. Bisogni, K. Wohlfeld, S. Nishimoto,C. Monney, J. Trinckauf, K.J. Zhou, R. Kraus, K. Koepernik, C. Sekar, V. Strocov, B. Buchner, T. Schmitt, J. van den Brink, J. Geck, "Spin-orbital separation in the anisotropic ladder system CaCu2O3"; Phys. Rev. Lett. 114, 096402 (2015); paper; arxiv. 
36. K. Wohlfeld, C.-C. Chen, M. van Veenendaal, T. P. Devereaux, "Spin chain in magnetic field: limitations of the large-N mean-field theory"; Acta Physica Polonica A 127, 201 (2015); paper; arxiv. 
37. C. J. Jia, E. A. Nowadnick, K. Wohlfeld, C.-C. Chen, S. Johnston, T. Tohyama, B. Moritz, T. P. Devereaux, "Persistent spin excitations in doped antiferromagnets revealed by resonant inelastic light scattering"; Nature Communications 5, 3314 (2014); paper, arxiv. 
38. K. Wohlfeld, S. Nishimoto, M. W. Haverkort, J. van den Brink, "Microscopic origin of spin-orbital separation in Sr2CuO3"; Phys. Rev. B 88, 195138 (2013); paper, arxiv. 
39. E. Benckiser, L. Fels, G. Ghiringhelli, M. Moretti Sala, T. Schmitt, J. Schlappa, V. N. Strocov, N. Mufti, G. R. Blake, A. A. Nugroho, T. T. M. Palstra, M. W. Haverkort, K. Wohlfeld, M. Gruninger, "Orbital superexchange and crystal field simultaneously at play in YVO3: resonant inelastic x-ray scattering at the V L edge and the O K edge"; Phys. Rev. B 88 , 205115 (2013); paper, arxiv. 
40. P. Marra, S. Sykora, K. Wohlfeld, J. van den Brink, "Resonant Inelastic X-Ray Scattering as a Probe of the Phase and Excitations of the Order Parameter of Superconductors", Phys. Rev. Lett. 110, 117005 (2013); paper, arxiv. 
41. K. Wohlfeld, M. Daghofer, G. Khaliullin, J. van den Brink, "Dispersion of orbital excitations in 2D quantum antiferromagnets", J. Phys.: Conf. Ser. 391, 012168 (2012); paper, arxiv. 
42. P. Marra, K. Wohlfeld, J. van den Brink, "Unravelling orbital correlations with magnetic resonant inelastic x-ray scattering", Phys. Rev. Lett. 109, 117401 (2012); paper, arxiv. 
43. J. Schlappa, K. Wohlfeld, K. J. Zhou, M. Mourigal, M. W. Haverkort, V. N. Strocov, L. Hozoi, C. Monney, S. Nishimoto, S. Singh, A. Revcolevschi, J.-S. Caux, L. Patthey, H. M. Ronnow, J. van den Brink, and T. Schmitt "Spin-Orbital Separation in the quasi 1D Mott-insulator Sr₂CuO₃", Nature 485, 82 (2012); paper, arxiv, News and Views by Ralph Claessen. 
44. K. Wohlfeld, M. Daghofer, S. Nishimoto, G. Khaliullin, J. van den Brink, "Intrinsic Coupling of Orbital Excitations to Spin Fluctuations in Mott Insulators", Physical Review Letters 107, 147201 (2011); paper, arxiv. 
45. K. Wohlfeld, M. Daghofer, A. M. Oleś, "Spin-orbital physics for p orbitals in alkali RO₂ hyperoxides --- generalization of the Goodenough-Kanamori rules", EPL 96, 27001 (2011); paper, arxiv. 
46. K. Wohlfeld, A. M. Oleś, G. A. Sawatzky, " t-J model of coupled Cu₂O₅ ladders in Sr_14-xCa_xCu₂₄O₄₁", Physical Review B 81, 214522 (2010); paper, arxiv. 
47. K. Wohlfeld, A. M. Oleś, G. A. Sawatzky, "Charge density wave in Sr_14-xCa_xCu₂₄O₄₁", Physica Status Solidi (b) 247, 668-670 (2010); paper, arxiv. 
48. K. Wohlfeld, "Spin, orbital, and spin-orbital polarons in transition metal oxides", AIP Conf. Proc. 1162, 220-225 (2009); paper, arxiv. 
49. K. Wohlfeld, A. M. Oleś, P. Horsch, "Orbitally induced string formation in the spin-orbital polarons", Physical Review B 79, 224433 (2009); paper, arxiv, viewpoint in Physics by Mona Berciu. 
50. K. Wohlfeld, A. M. Oleś, M. Daghofer, P. Horsch, "Reiter's wavefunction applied to a t_2g orbital t-J model", Acta Physica Polonica A 115, 110 (2009); paper, arxiv. 
51. K. Wohlfeld, M. Daghofer, A. M. Oleś, P. Horsch, "Spectral properties of orbital polarons in Mott insulators", Physical Review B 78, 214423 (2008); paper, arxiv. 
52. K. Wohlfeld, "Polaron in the t-J models with three-site terms: the SU(2) and the Ising cases", AIP Conf. Proc. 1014, 265-269, (2008); paper, arxiv. 
53. M. Daghofer, K. Wohlfeld, A. M. Oleś, E. Arrigoni, P. Horsch, "Absence of hole confinement in transition metal oxides with orbital degeneracy", Physical Review Letters 100, 066403 (2008); paper, arxiv. 
54. K. Wohlfeld, A. M. Oleś, G. A. Sawatzky, "Origin of charge density wave in the coupled spin ladders of Sr_14-xCa_xCu₂₄O₄₁", Physical Review B 75, 180501 (2007); paper, arxiv. 
55. K. Wohlfeld, "Doped Spin Ladder: Zhang-Rice Singlets or Rung-centred Holes?", AIP Conf. Proc. 918, 337-341, (2007); paper, arxiv. 
56. K. Wohlfeld, A. M. Oleś, G. A. Sawatzky, "Charge density wave in the spin ladder of Sr_14-xCa_xCu₂₄O₄₁", Physica C 460-462, 1043-1044 (2007); paper, arxiv. 
57. K. Wohlfeld, "Double exchange model for correlated electrons in systems with t_2g orbital degeneracy", AIP Conf. Proc. 846, 295-303, (2006); paper, arxiv. 
58. K. Wohlfeld, A. M. Oleś, "Double exchange model in cubic vanadates", Physica Status Solidi (b) 243, 142-145 (2006); paper, arxiv. 

PhD students:

• Dorota Gotfryd (graduated in 2021)
• Adam Kłosiński (graduated in 2023)
• Piotr Wrzosek (graduated in 2023)

Teaching:

• Quantum Theory of Magnetism and its Applications to Real Materials (2019) 
• Mechanika Kwantowa dla Inzynierii Nanostruktur oraz Energetyki i Chemii Jadrowej (2019) 
• ZPS (2018) 

Download and links:

• Curriculum Vitae (pdf) 
• PhD Thesis (pdf) 
• Thanks to Les Houches School (jpg) 
• Popular pieces on the spin-orbital separation story can be found here: IFW Annual Report, BBC, FAZ, IFW and PSI press release, Nature News, NZZ, Die Welt, Physics World, Der Tagesspiegel 
• Link to the published papers on publons (not always up to date): publons 
• Link to my profile at google scholar
  

Hobby = travelling (only trips outside Poland and excluding my longer stays in Dresden and Palo Alto but including also some of the work-related trips; trips longer than ca. 2-3 days only):

• 1987: Bulgaria (Black Sea coast, Michurin), Czechoslovakia (Prague) 
• 1988: Bulgaria (Black Sea coast, Varna) 
• 1989: Bulgaria (Black Sea coast, Varna) 
• 1990: England (one month in an elementary school in Sheffield and two days in London), Bulgaria (Black Sea coast, Varna) 
• 1991: Soviet Union (Sochi, incl. a one-day trip to Abkhazia) 
• 1992: England (one month in an elementary school in Sheffield and two days in London), Czechoslovakia (Zemplinska Sirava) 
• 1993: Austria (two days in Vienna in December) 
• 1994: Hungary (two days in Budapest in June) 
• 1995: Wales (one week in Bangor in May), Slovakia (Tatra Mountains) 
• 1996: Germany (one week in Nuremberg, Regensburg, Erlangen, and Leipzig), Slovakia (Tatra Mountains) 
• 1997: Italy (one week: Udine, Trieste + one day in Venice), Switzerland (more than two weeks in the countryside of the Fribourg canton -- trips around, incl. Evian, Lausanne, Bern, Zurich, Gstaad, Interlaken), Slovakia (Tata Mountains) 
• 1998: Austria (one week in Kaprun -- skiing), the Netherlands (Nijmegen as a base and then short trips to Utrecht, Amsterdam, the Hauge, Leiden, Rotterdam, and Delft; coming back via Brussels), the Czech Republic (one week in Prague), Ukraine (few days in Lviv), Slovakia (Tatra Mountains) 
• 1999: France (one week in Lille and one week in Paris; Dresden on the way), Italy (two weeks in Venice, Padova, Verona, Ancona, San Marino, Rimini, Bologna) and Greece (two weeks following a "standard itinerarary" with Athens, the Peloponnese peninsula, and Crete), Italy (another week on a cheap school trip in autumn: Bibione, again Padova and Venice) 
• 2000: Slovakia (1999/2000: skiing in Chopok), Germany (one week in Berlin in winter), Italy (three weeks: "everything" from the northern border down to Rome + Sardegna) and France on the way there (one week: Chamonix, Corsica), Hungary (one week on the Balaton lake) and Slovenia (one week in Bohinj; Ljubljana, Zagreb and Graz on the way), US (one week in Iowa and Chicago on the way) 
• 2001: Finland (one week in winter in Helsinki), Austria (one week in the Alps -- Filzmoos) and the Czech Republic (two weeks in Stozec), Spain and Portugal (one month: "everything"; Toulouse, Lourdes, and Basel on the way), Romania (two weeks: Sinaia as a base and then Bucovina for another week; Bucharest, Constanta, Ukraine and Hungary on the way) 
• 2002: Austria (one week in winter in Semmering and one day in Sopron, Bratislava on the way), Austria (two weeks in the Alps -- Heiligenblut and Millstatt), Eastern Turkey (a long three-week trip from Antalya up to the border with Iran, Armenia, and Georgia) 
• 2003: Portugal (one week in winter in Madeira; beautiful), Ukraine (a "night train trip": Cernivci, Kamenets Podilski, Odesa, Kyiv, and Lviv), Austria (two days in Vienna -- Chwistek's exhibition and again hiking in the Semmering area), Hungary (few fays in Telkibanya, Eger on the way), Switzerland (two months and a half in PSI, Villigen and weekend trips from there incl. one week trip to Engadin), Italy (short one week from Switzerland: beach in Pesaro, Urbino, Peruggia, Assisi, Spoleto, Florence), Southern France and Liguria (one week after PSI: Grenoble, Orange, Marseille, Nimes, Cannes, Monaco, San Remo, Finale Ligure) 
• 2004: the Netherlands (more than five months of Erasmus: weekend trips around the country), Belgium (Easter in the Ardennes -- "weekend gastronomique", a one day trip to Luxembourg), Slovakia (around Roznava), Austria (two weeks in the Alps in Rauris) and northern Italy (Garda lake and Verona), Ukraine (almost two weeks in Crimea, coming back via Kyiv, Lviv, Drohobitsh, and Uzhorod), Hungary (two days in Budapest) 
• 2005: Germany (two weeks in Aachen and two short trips to Brussels, Mechelen, and Leuven), Malta (one week Easter break), the Czech Republic (one week in small towns in Moravia: Telc, Litomysl, Trebic, etc.) and Vienna (few days), Norway (Oslo-Trondheim-Lofoten-Jotunheimen-Alesund-Sognefjord-Bergen-Oslo), Italy (few days in Naples and two weeks in Vietri Sul Mare) 
• 2006: Switzerland (one week cross country skiing in Kandersteg), Slovakia (Zuberec and Podbanske in the West Tatras), China (three weeks: Shanghai-Taian-Beijing-Hong Kong-Xiamen-Shanghai) and Finland (few days when coming back: lakes around Tampere), Germany (few days in Dresden and surroundings) and the Czech Republic (two days in Prague), Italy (two weeks in Vietri Sul Mare) 
• 2007: Norway (one week cross country skiing in Gala), Germany (several short trips during my half a year stay in Stuttgart: Schwarzwald and the area around Stuttgart), France (few days in Alsace), Denmark (few short trips: Aarhus, Copenhagen, and around), Slovakia (two weeks in the Low Tatras, Slovak Paradise, Muranska Planina, High Tatras) and Hungary (few days in Telkibanya and Tokai in between the holidays in Slovakia), France (one week in Bessans in the Alps and two weeks in Les Houches, incl. climbing Mont Blanc, Annecy and Aosta on the way), Italy (two weeks in Vietri Sul Mare) 
• 2008: Slovakia (2007/2008: few days in the High Tatras), Canada (one month in Vanocuver, trips around, incl. skiing in Whistler; one day trip to Seattle), Finland (one week cross country skiing in Lapland) and Estonia (one day in Tallinn on the way back by ferry from Helsinki), Italy (one week in Gran Paradiso, few days in Levanto and Cinque Terre, Bologna on the way back) and France (few days around Geneva and Chamonix), Cyprus (one week Pafos, Nicosia, two trips to the northen part) and Israel (one week: coming by ferry to Haifa from Cyprus, flying back by plane, "everything" incl. the West Bank), Italy (two weeks in Vietri Sul Mare), Germany (few days in Braunschweig, Goslar on the way; one weekend in Eisenach, one weekend in Munich) 
• 2009: Slovakia (2008/2009: few days in the High Tatras), Norway (one week cross country skiing in Fefor), Spain (Gomera and Teneriffe; climbing Teide), Switzerland (one week in Saas-Fee in autumn), Germany (few days in Hamburg, Luebeck, and Mecklenburg in December) 
• 2010: Switzerland (2009/2010: one week skiing in Grindelwald), US (one week in Portland: Mount St. Helen's and San Francisco on the way), the Faroe Islands (one week), England and Wales (few days in Bristol, Bath, Cardiff, and the highest peak of southern Wales) 
• 2011: Switzerland (2010/2011: one week skiing in Fiesch), Malta (few days) and one week in Sicily ("everything"), Germany (few days in the Harz mountains), Bulgaria (Rila and Pirin, Sofia and one day in northern Greece) 
• 2012: Austria (2011/2012: one week skiing in Hochkoening), US (two trips: one week in Boston and San Francisco each), Switzerland (few days in Zurich, Geneva, and Fribourg), Austria (few days in Graz visiting Maria), Spain (two weeks in Andalusia, one day in Morocco and in Gibraltar) 
• 2013: Switzerland (2012/2013: one week skiing in Saas Fee), US (Northern California trip: Lassen and the Redwoods -- 10 days), US (several short trips: Washington, Baltimore, Yosemite, Lake Tahoe, Death Valley, LA) 
• 2014: Slovakia (2013/2014: three days), US (few days in NYC and a four-day train trip from NYC to SFO), US (several short trips: Lake Tahoe, Big Sur, Denver, skiing in Colorado, Sequoia National Park, Markleeville, etc.; Utah-Colorado-Southern California; San Diego and Santa Barbara) 
• 2015: Lake Tahoe (ski trip), Paris and Dresden revisited, La Palma island (Spain), Western Tatras (Slovakia), Kos island (Greece) with a short visit to Bodrum (Turkey), Split and Trogir (Croatia), Taiwan 
• 2016: Lapland (ski trip), Berlin, Croatia (Vis, Brac, Mljet), Beskid Niski (Chyrowa), Fuerteventura 
• 2017: Saas-Grund, Sedrun and Malbun (skiing), Milan, Ischia, Southern US (Tennessee, Georgia, and Alabama), Greece (Samothraki, Thassos), Beskid Niski (Chyrowa), Hungary (Zempleni hills), Hamburg, Barcelona 
• 2018: Saas-Grund, Oxford, Northern California, Oregon, Washington, British Columbia, Boston, San Sebastian, Amsterdam 
• 2019: Kals am Grossglockner, Ischia, Oxford, Mallorca, Ibiza, Formentera, Bieszczady, Beskid Niski, Odessa, Bad Honnef, High Tatras 
• 2020: Kals am Grossglockner, Villigen, Fribourg, Portes du Soleil, Friuli-Venezia Giulia (Tarvisio, Carso), Istria, Cres, Losinj, Lubuskie Lakeland, Oberpinzgau 
• 2021: Zuberec (Rohace), Scuol (Lower Engadin), Italy (Toscany, Como and Lugano lakes, Suedtirol, Friuli), Slovenia (Soca valley) 
• 2022: Zuberec (Rohace), Horny Smokovec, Kals am Grossglockner, Vienna, Romania (Maramures, Cluj, Sibiu and surroundings, Transfagaras route), Bulgaria (Veliko Tarnovo and surroundings), Greece (Thrace, Sithonia, Lemnos), North Macedonia (Skopje, Stobi), Serbia (Vranje, Belgrade, Kanjiza), Slovakia (Donovaly), Switzerland (St. Gallen, Appenzell, Wallensee)  
• 2023: Horny Smokovec, Japan (Tokyo, Nikko, Kamakura, Kagura ski resort near Gala Yuzawa), Kals am Grossglockner, Amsterdam, Ischia, California (Santa Barbara, Los Angelese, San Francisco, Palo Alto, Santa Cruz), Czechia (Znojmo, Vranov), Austria (Retz, Thayatal, Osttirol), Italy (San Candido, Carso, Grado, Caorle), Slovenia (Skocjan), Croatia (Rijeka, Krk), Hungary (Fertoed, Miskolc, Buekk), Slovakia (Bardejov), Dresden, Munich, Leipzig  

Email address: k.wohlfeldINuw.edu.sk (please replace "IN" by "@" and "sk" by "pl") 

April 2024