Electronic Resource
Springer
The European physical journal
98 (1995), S. 239-250
ISSN:
1434-6036
Keywords:
74.20
;
71.10
;
75.10J
;
71.30
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract We propose a Green's function technique, to investigate finite-temperature properties of the Hubbard model on the triangular lattice. The lattices are covered by dimers. The method is exact in two limits:U=0 or decoupled dimers. We apply this approximate method to calculate the ground state energy, the specific heat and the single-particle spectral weight for the 1/2-filled case. The largest lattice considered has 16×16 sites. The approximate ground state energy as a function of the on-site interactionU oscillates around the exact energyin the 1/2-filled case. We find two peaks in the specific heat. ForU≥5t the single-particle spectral weight splits into upper and lower Hubbard bandasymmetrically. Thus in the 1/2-filled case the chemical potential is placed in the upper band leading to a metallic state. The approximate technique yields a finite zero-point entropy for mediumU. All the investigations signal a RVB state in the range of mediumU as formerly proposed by Callaway.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01324530
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