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arXiv 1102.4404cond-mat.str-el
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椭圆自旋1/2 Kondo模型玻色化的扩展二能级量子耗散系统

Extended two-level quantum dissipative system from bosonization of the elliptic spin-1/2 Kondo model

Sol H. Jacobsen, P. D. Jarvis

摘要:

我们研究了椭圆自旋1/2近藤模型(自旋1/2费米子在一维与磁杂质的完全各向异性接触相互作用)的光映射到玻色子系统使用的费米子玻色子对应和相关的幺正变换。我们证明了,对于固定的费米子数,玻色子系统描述了一个两能级的量子耗散系统的两个无相互作用的副本的无限简并的上,下能级。除了标准的隧穿跃迁和耗散耦合驱动的跃迁外,还存在上下态之间的浴介导的跃迁,其同时影响水平简并标签的转变。我们推测,这些系统可以提供新的例子,连续时间量子随机游动,这是完全可解的。

英文摘要:

We study the elliptic spin-1/2 Kondo model (spin-1/2 fermions in one dimension with fully anisotropic contact interactions with a magnetic impurity) in the light of mappings to bosonic systems using the fermion-boson correspondence and associated unitary transformations. We show that for fixed fermion number, the bosonic system describes a two-level quantum dissipative system with two noninteracting copies of infinitely-degenerate upper and lower levels. In addition to the standard tunnelling transitions, and the transitions driven by the dissipative coupling, there are also bath-mediated transitions between the upper and lower states which simultaneously effect shifts in the horizontal degeneracy label. We speculate that these systems could provide new examples of continuous time quantum random walks, which are exactly solvable.

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。

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