Phase transitions in the spinless Falicov-Kimball model with
correlated hopping |
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Authors: | H??en?ariková P?Farka?ovsky |
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Institution: | 1.Institute of Experimental Physics, Slovak Academy of
Sciences,Ko?ice,Slovakia |
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Abstract: | The canonical Monte-Carlo is used to study the phase transitions from the
low-temperature ordered phase to the high-temperature disordered phase in
the two-dimensional half-filled Falicov-Kimball model with correlated
hopping. As the low-temperature ordered phase we consider the chessboard
phase, the axial striped phase and the segregated phase.
It is shown specifically for weak coupling, which is the most interesting
regime, that all three phases persist also at finite temperatures (up to
the critical temperature τ
c
) and that the phase transition at the
critical point is of the first order for the chessboard and axial striped
phase and of the second order for the segregated phase. In addition, it is
found that the critical temperature is reduced with the increasing amplitude
of correlated hopping t' in the chessboard phase and it is strongly
enhanced by t' in the axial striped and segregated phase. |
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Keywords: | |
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