Equilibrium dynamics of the sub-ohmic spin-boson model at finite temperature*

被引：1
|
作者：
Yang, Ke [1 ]
Tong, Ning-Hua [1 ]
机构：
[1] Renmin Univ China, Dept Phys, Beijing 100072, Peoples R China
来源：
CHINESE PHYSICS B | 2021年 / 30卷 / 04期
基金：
中国国家自然科学基金;
关键词：
spin-boson model; full-density matrix renormalization group; quantum phase transition; dynamical correlation function; finite temperature; NUMERICAL RENORMALIZATION-GROUP;
D O I：
10.1088/1674-1056/abd393
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We use the full-density matrix numerical renormalization group method to calculate the equilibrium dynamical correlation function C(omega) of the spin operator sigma(z) at finite temperature for the sub-ohmic spin-boson model. A peak is observed at the frequency omega(T) similar to T in the curve of C(omega). The curve merges with the zero-temperature C(omega) in omega >> omega(T) and deviates significantly from the zero-temperature curve in omega MUCH LESS-THAN omega(T).
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页数：7
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