Premium
The Thermopower of a Structurally Disordered Hubbard Model
Author(s) -
Liu K. L.
Publication year - 1995
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221870244
Subject(s) - seebeck coefficient , hubbard model , condensed matter physics , exponential function , physics , range (aeronautics) , thermal , materials science , thermodynamics , mathematics , thermal conductivity , mathematical analysis , superconductivity , composite material
The thermopower S of a structurally disordered Hubbard model with a quasi‐exponential transfer integral is studied. Two cases are considered: (i) the infinite‐ U case near half‐filling and (ii) the finite‐ U case with various electronic concentrations. Approximations for the required correlation functions are constructed based on their short‐time expansions which are carried out to higher orders in the electronic hopping. For both cases, S is found to be in accord with the generalized Heikes formula at high temperatures. In the temperature range where the thermal energy is comparable to the characteristic hopping energy, the thermopower of case (ii) varies rapidly with decreasing temperature.