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cond-mat.str-el2022★ 6 cited
Long-range order in the XY model on the honeycomb lattice
Jacek Wojtkiewicz, Krzysztof Wohlfeld, Andrzej M. Oleś
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…
cond-mat.str-el2003★ 2 cited
Phase diagram of the two-dimensional t-t' Falicov-Kimball model
Jacek Wojtkiewicz
The ground-state phase diagram of two-dimensional Falicov-Kimball model with nearest-neighbour and next-nearest-neighbour hoppings (characterized by t,t' constants, respectively) h…
cond-mat.str-el2001★ 28 cited
Ground States of the Falicov-Kimball model with correlated hopping
J. Wojtkiewicz, R. Lemanski
Two-dimensional spinless Falicov-Kimball model (FKM) with correlated hopping is studied perturbatively in the limit of large on-site Coulomb interaction . In the neutral case th…