摘要
We use the full-density matrix numerical renormalization group method to calculate the equilibrium dynamical correlation function C(ω) of the spin operator σ_(z) at finite temperature for the sub-ohmic spin-boson model.A peak is observed at the frequency ω_(T)~T in the curve of C(ω).The curve merges with the zero-temperature C(ω) in ω>>ω_(T) and deviates significantly from the zero-temperature curve in ω<<ω_(T).
作者
Ke Yang
Ning-Hua Tong
杨珂;同宁华(Department of Physics,Renmin University of China,Beijing 100072,China)
基金
Project supported by the National Natural Science Foundation of China(Grant Nos.11374362 and 11974420)
the Fundamental Research Funds for the Central Universities,China
the Research Funds of Renmin University of China(Grant No.15XNLQ03)。
