Krzysztof Wohlfeld (homepage)


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

Brief CV:


  1. 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"; arxiv (2023).  
  2. T. Kulka, M. Panfil, M. Berciu, K. Wohlfeld, "Nature of spinons in the 1D Heisenberg antiferromagnet"; arxiv (2023).  
  3. 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).  
  4. K. Wohlfeld, "Propagation of an orbiton in the antiferromagnets: theory and experimental verification"; arxiv (2019).  

Accepted papers:

  1. 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.  
  2. 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.  
  3. 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.  
  4. 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.  
  5. 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.  
  6. 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.  
  7. 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. 
  8. P. Wrzosek and K. Wohlfeld, "Hole in the 2D Ising Antiferromagnet: Origin of the Incoherent Spectrum", Phys. Rev. B 103, 035113 (2021); paper; arxiv. 
  9. 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. 
  10. 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. 
  11. 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. 
  12. 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. 
  13. 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. 
  14. 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. 
  15. 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. 
  16. 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. 
  17. 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. 
  18. 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. 
  19. A. M. Oles, K. Wohlfeld, G. Khaliullin, "Orbital Symmetry and Orbital Excitations in High-Tc Superconductors"; Condensed Matter 4, 46 (2019); paper; arxiv. 
  20. 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. 
  21. 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. 
  22. 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. 
  23. 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. 
  24. 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. 
  25. 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. 
  26. 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. 
  27. 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. 
  28. 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. 
  29. 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. 
  30. 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 
  31. 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. 
  32. 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. 
  33. 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. 
  34. 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. 
  35. 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. 
  36. 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. 
  37. 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. 
  38. 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. 
  39. 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. 
  40. 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. 
  41. 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. 
  42. 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. 
  43. 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. 
  44. K. Wohlfeld, A. M. Oleś, G. A. Sawatzky, " t-J model of coupled Cu2O5 ladders in Sr14-xCaxCu24O41", Physical Review B 81, 214522 (2010); paper, arxiv. 
  45. K. Wohlfeld, A. M. Oleś, G. A. Sawatzky, "Charge density wave in Sr14-xCaxCu24O41", Physica Status Solidi (b) 247, 668-670 (2010); paper, arxiv. 
  46. K. Wohlfeld, "Spin, orbital, and spin-orbital polarons in transition metal oxides", AIP Conf. Proc. 1162, 220-225 (2009); paper, arxiv. 
  47. 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. 
  48. K. Wohlfeld, A. M. Oleś, M. Daghofer, P. Horsch, "Reiter's wavefunction applied to a t2g orbital t-J model", Acta Physica Polonica A 115, 110 (2009); paper, arxiv. 
  49. 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. 
  50. 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. 
  51. 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. 
  52. K. Wohlfeld, A. M. Oleś, G. A. Sawatzky, "Origin of charge density wave in the coupled spin ladders of Sr14-xCaxCu24O41", Physical Review B 75, 180501 (2007); paper, arxiv. 
  53. K. Wohlfeld, "Doped Spin Ladder: Zhang-Rice Singlets or Rung-centred Holes?", AIP Conf. Proc. 918, 337-341, (2007); paper, arxiv. 
  54. K. Wohlfeld, A. M. Oleś, G. A. Sawatzky, "Charge density wave in the spin ladder of Sr14-xCaxCu24O41", Physica C 460-462, 1043-1044 (2007); paper, arxiv. 
  55. K. Wohlfeld, "Double exchange model for correlated electrons in systems with t2g orbital degeneracy", AIP Conf. Proc. 846, 295-303, (2006); paper, arxiv. 
  56. K. Wohlfeld, A. M. Oleś, "Double exchange model in cubic vanadates", Physica Status Solidi (b) 243, 142-145 (2006); paper, arxiv. 


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May 2023