Thermal transport in a one-dimensional Z2 spin liquid

被引:14
|
作者
Metavitsiadis, Alexandros [1 ]
Brenig, Wolfram [1 ]
机构
[1] Tech Univ Carolo Wilhelmina Braunschweig, Inst Theoret Phys, D-38106 Braunschweig, Germany
关键词
CONDUCTIVITY; MODEL; LOCALIZATION; TEMPERATURE; EXCITATIONS; LADDER; CHAIN;
D O I
10.1103/PhysRevB.96.041115
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We study the dynamical thermal conductivity of the Kitaev spin model on a two-leg ladder. In contrast to the majority of conventional one-dimensional spin systems, we show the ladder to exhibit no ballistic channel and a zero-frequency pseudogap. This is a direct consequence of the fractionalization of spins into mobile Majorana matter and a static Z(2) gauge field, which acts as an emergent thermally activated disorder. Our finding rests on complementary calculations of the current correlation function, comprising a phenomenological mean-field treatment of thermal gauge fluctuations, a complete summation over all gauge sectors, as well as exact diagonalization of the original spin model. The results will also be contrasted against the conductivity discarding gauge fluctuations.
引用
收藏
页数:5
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