Unusual low-temperature thermopower in the one-dimensional Hubbard model

TL;DR

This paper investigates the low-temperature thermopower in the 1D Hubbard model, revealing unusual temperature and doping behaviors similar to high-temperature superconductor normal states.

Contribution

It introduces an asymptotic Bethe ansatz approach to analyze thermopower, highlighting the interplay between holons and spinons.

Findings

Unusual temperature dependence of thermopower observed

Doping dependence aligns qualitatively with high-$T_c$ superconductors

Holon and spinon entropy competition explains thermopower behavior

Abstract

The low-temperature thermoelectric power of the repulsive-interaction one-dimensional Hubbard model is calculated using an asymptotic Bethe ansatz for holons and spinons. The competition between the entropy carried by the holons and that carried by the backflow of the spinons gives rise to an unusual temperature and doping dependence of the thermopower which is qualitatively similar to that observed in the normal state of high-$T_{c}$ superconductors.