arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1706.09897cond-mat.stat-mech
收藏

玻色共形界面的二分保真度和Loscherton回声

Bipartite Fidelity and Loschmidt Echo of Bosonic Conformal Interface

Tianci Zhou, Mao Lin

摘要:

本文通过计算Loscherton回波和二分保真度研究了一类玻色共形界面的量子猝灭问题。当连接两个一维临界系统时,可以将失超看作由$θ$参数化的边界条件的突变。它们被分类的$S(θ)$矩阵与当前的散射过程中的接口。由此产生的淬火的Loschlund回声具有长时间的代数衰减$t^{-α}$,其指数也出现在有限尺寸的二分保真度为$L^{-\fracα{2}}$。我们进行了分析和数值计算的指数$α$,并发现它有一个二次依赖于$θ$的变化,如果前,后淬火边界条件是相同类型的$S$,而其余的$\frac{1}{4}$,否则。这些界面的可能的物理实现包括例如连接不同的量子线(Luttinger液体)、拓扑相边缘状态的淬灭等,并且指数可以在X射线边缘奇异性类型实验中检测。

英文摘要:

We study the quantum quench problem for a class of bosonic conformal interfaces by computing the Loschmidt echo and the bipartite fidelity. The quench can be viewed as a sudden change of boundary conditions parameterized by $θ$ when connecting two one-dimensional critical systems. They are classified by $S(θ)$ matrices associated with the current scattering processes on the interface. The resulting Loschmidt echo of the quench has long time algebraic decay $t^{-α}$, whose exponent also appears in the finite size bipartite fidelity as $L^{-\fracα{2}}$. We perform analytic and numerical calculations of the exponent $α$, and find that it has a quadratic dependence on the change of $θ$ if the prior and post quench boundary conditions are of the same type of $S$, while remaining $\frac{1}{4}$ otherwise. Possible physical realizations of these interfaces include, for instance, connecting different quantum wires (Luttinger liquids), quench of the topological phase edge states, etc. and the exponent can be detected in a X-ray edge singularity type experiment.

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。

↑