Zobrazeno 1 - 10
of 89
pro vyhledávání: '"Krzysztof, Wohlfeld"'
Autor:
Piotr Wrzosek, Adam Kłosiński, Yao Wang, Mona Berciu, Cliò Efthimia Agrapidis, Krzysztof Wohlfeld
Publikováno v:
SciPost Physics, Vol 17, Iss 1, p 018 (2024)
The stability of the spin polaron quasiparticle, well established in studies of a single hole in the 2D antiferromagnets, is investigated in the 1D antiferromagnets using a $t$-$J$ model. We perform an exact slave fermion transformation to the holon-
Externí odkaz:
https://doaj.org/article/cb91e0b3f21740d1aaa0c1548f2450fb
Autor:
Wenliang Zhang, Cliò Efthimia Agrapidis, Yi Tseng, Teguh Citra Asmara, Eugenio Paris, Vladimir N. Strocov, Enrico Giannini, Satoshi Nishimoto, Krzysztof Wohlfeld, Thorsten Schmitt
Publikováno v:
npj Quantum Materials, Vol 7, Iss 1, Pp 1-10 (2022)
Abstract The nature of the spin excitations in superconducting cuprates is a key question toward a unified understanding of the cuprate physics from long-range antiferromagnetism to superconductivity. The intense spin excitations up to the over-doped
Externí odkaz:
https://doaj.org/article/2c0274be8eb344029502cccc33b89c49
Publikováno v:
Nature Communications, Vol 8, Iss 1, Pp 1-6 (2017)
Some iridate compounds such as Sr2IrO4 have electronic and atomic structures similar to quasi-2D copper oxides, raising the prospect of high temperature superconductivity. Here, the authors show that there is significant electron-hole asymmetry in ir
Externí odkaz:
https://doaj.org/article/2204f450ca194a5ca9f3847c3516cf96
Using the reflection positivity method we provide the rigorous proof of the existence of long range magnetic order for the XY model on the honeycomb lattice for large spins $S\ge 2$. This stays in contrast with the result obtained using the {\it same
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e9741b781ffa5f1c14a04bf63f5f4136
https://ruj.uj.edu.pl/xmlui/handle/item/308181
https://ruj.uj.edu.pl/xmlui/handle/item/308181
We study the stability of the fermionic quasiparticle in a fermion-boson model on a Bethe lattice, with fermions interacting with local bosons via a polaronic-type coupling. We solve the problem by mapping it onto a non-interacting chain with site-de
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bdbdbd4cc32da010ae8733b72d1c7d8f
http://arxiv.org/abs/2212.11065
http://arxiv.org/abs/2212.11065
Publikováno v:
Condensed Matter, Vol 5, Iss 3, p 53 (2020)
Several realistic spin-orbital models for transition metal oxides go beyond the classical expectations and could be understood only by employing the quantum entanglement. Experiments on these materials confirm that spin-orbital entanglement has measu
Externí odkaz:
https://doaj.org/article/b628aaffdac24f5e878135c162036cc3
Publikováno v:
Physical Review Research, Vol 2, Iss 1, p 013353 (2020)
The concept of the entanglement between spin and orbital degrees of freedom plays a crucial role in our understanding of various phases and exotic ground states in a broad class of materials, including orbitally ordered materials and spin liquids. We
Externí odkaz:
https://doaj.org/article/4137203e28664a60bb82f87f9f8e96a1
Publikováno v:
SciPost Physics, Vol 7, Iss 5, p 066 (2019)
We study the problem of a single hole in an Ising antiferromagnet and, using the magnon expansion and analytical methods, determine the expansion coefficients of its wave function in the magnon basis. In the 1D case, the hole is "weakly" confined
Externí odkaz:
https://doaj.org/article/c86d5f58b6e943d185129874b88aaa03
Publikováno v:
Condensed Matter, Vol 4, Iss 2, p 46 (2019)
We discuss a few possibilities of high- T c superconductivity with more than one orbital symmetry contributing to the pairing. First, we show that the high energies of orbital excitations in various cuprates suggest a simplified model with a single o
Externí odkaz:
https://doaj.org/article/b70d10b48ab44a349db3fc681e2c6816
Autor:
Stephen Hill, Jakub Gawraczyński, Dominik Kurzydłowski, Russell A Ewings, Paolo Barone, Giampiero Ruani, Andrew Ozarowski, Krzysztof Wohlfeld, Wojciech Grochala, Piotr J. Leszczyński, Ilaria Bergenti, Mariana Derzsi, Zoran Mazej, Wojciech Gadomski, Tomasz Jaroń, Subrahmanyam Bandaru, José Lorenzana, Kamil Tokár
Publikováno v:
Proceedings of the National Academy of Sciences of the United States of America
Proceedings of the National Academy of Sciences of the United States of America (Online) 116 (2019): 1495–1500. doi:10.1073/pnas.1812857116
info:cnr-pdr/source/autori:Jakub Gawraczynski,b, Dominik Kurzyd?owski, Russell A. Ewings, Subrahmanyam Bandaru, Wojciech Gadomski, Zoran Mazej, Giampiero Ruani, Ilaria Bergenti, Tomasz Jaron, Andrew Ozarowski, Stephen Hill, Piotr J. Leszczynski, Kamil Tokar, Mariana Derzsi, Paolo Barone, Krzysztof Wohlfeld, Jose´ Lorenzana, Wojciech Grochala/titolo:Silver route to cuprate analogs/doi:10.1073%2Fpnas.1812857116/rivista:Proceedings of the National Academy of Sciences of the United States of America (Online)/anno:2019/pagina_da:1495/pagina_a:1500/intervallo_pagine:1495–1500/volume:116
Proceedings of the National Academy of Sciences of the United States of America (Online) 116 (2019): 1495–1500. doi:10.1073/pnas.1812857116
info:cnr-pdr/source/autori:Jakub Gawraczynski,b, Dominik Kurzyd?owski, Russell A. Ewings, Subrahmanyam Bandaru, Wojciech Gadomski, Zoran Mazej, Giampiero Ruani, Ilaria Bergenti, Tomasz Jaron, Andrew Ozarowski, Stephen Hill, Piotr J. Leszczynski, Kamil Tokar, Mariana Derzsi, Paolo Barone, Krzysztof Wohlfeld, Jose´ Lorenzana, Wojciech Grochala/titolo:Silver route to cuprate analogs/doi:10.1073%2Fpnas.1812857116/rivista:Proceedings of the National Academy of Sciences of the United States of America (Online)/anno:2019/pagina_da:1495/pagina_a:1500/intervallo_pagine:1495–1500/volume:116
Significance Antiferromagnets can host strong quantum fluctuations in their ground state if they combine both low dimensionality and low spin. Materials based on copper oxides (spin-1/2 ions in layered or 1D structures) are unique in optimizing the t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::14dd3f3fa7df2097b7f446e0382a1312
https://doi.org/10.1073/pnas.1812857116
https://doi.org/10.1073/pnas.1812857116