arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0908.4058cond-mat.str-el
收藏

量子猝灭引起的双通道Kondo系统的非平衡动力学

Nonequilibrium dynamics in a two-channel Kondo system due to a quantum quench

Zurab Ratiani, Aditi Mitra

摘要:

Potok等人最近的实验表明,单通道费米液体固定点和双通道非费米液体固定点之间具有显著的可调谐性。受此启发,我们研究的非平衡动力学,由于突然淬火的哈密顿量的参数从单通道到双通道各向异性近藤系统。我们发现与杂质自旋相关的局部量的长时间行为与与系统的总(传导电子+杂质)自旋相关的批量量的长时间行为之间存在明显差异。特别是,当地的杂质自旋和当地的自旋磁化率被发现平衡,但在一个非常缓慢的幂律的方式,这是特有的非费米液体性质的哈密顿量。相反,我们发现在两个粒子的期望值与系统的总自旋的平衡缺乏。

英文摘要:

Recent experiments by Potok et al. have demonstrated a remarkable tunability between a single-channel Fermi liquid fixed point and a two-channel non-Fermi liquid fixed point. Motivated by this we study the nonequilibrium dynamics due to a sudden quench of the parameters of a Hamiltonian from a single-channel to a two-channel anisotropic Kondo system. We find a distinct difference between the long time behavior of local quantities related to the impurity spin as compared to that of bulk quantities related to the total (conduction electrons + impurity) spin of the system. In particular, the local impurity spin and the local spin susceptibility are found to equilibrate, but in a very slow power-law fashion which is peculiar to the non-Fermi liquid properties of the Hamiltonian. In contrast, we find a lack of equilibration in the two particle expectation values related to the total spin of the system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑