Coherent-incoherent transition in the sub-Ohmic spin-boson model

被引：49

作者：

Chin, A ^{[1
]}

Turlakov, M

机构：

[1] Univ Cambridge, Cavendish Lab, Condensed Matter Theory Grp, Cambridge CB3 OHE, England

[2] Univ Oxford, Peierls Ctr Theoret Phys, Oxford OX1 3NP, England

来源：

PHYSICAL REVIEW B | 2006年 / 73卷 / 07期

关键词：

D O I：

10.1103/PhysRevB.73.075311

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study the spin-boson model with a sub-Ohmic bath using a variational method. The transition from coherent dynamics to incoherent tunneling is found to be abrupt as a function of the coupling strength alpha and to exist for any power 0 < s < 1, where the bath coupling is described by J(omega)similar to alpha omega(s). We find nonmonotonic temperature dependence of the two-level gap K and a reentrance regime close to the transition due to nonadiabatic low-frequency bath modes. Differences between thermodynamic and dynamic conditions for the transition as well as the limitations of the simplified bath description are discussed.

引用

页数：11

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