arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 2311.07571cond-mat.str-elcond-mat.stat-mechcond-mat.supr-conquant-ph
收藏

临界Kitaev链中马约拉纳零模的普适签名

Universal signatures of Majorana zero modes in critical Kitaev chains

Nicolas Laflorencie

AI总结:

本研究在临界Kitaev链中引入两个拓扑标记,发现MZM保真度和占据数在(1+1)维Ising临界线上呈现普适值,分别依赖$\sqrt{8}/π$和Catalan常数,并给出有限尺寸修正消失条件。

摘要:

Kitaev链的许多拓扑或临界性质已广为人知,并有几个经典结果。相比之下,强马约拉纳零模(MZM)的临界行为研究一直被忽视。这里我们引入两个拓扑标记,令人惊讶的是,它们在整个(1+1)维Ising临界线上表现出非平凡的签名。我们首先解析计算MZM保真度${\cal{F}}_{\rm MZM}$——衡量MZM在奇偶性扇区之间映射的度量。它在(1+1)维Ising临界线上取普适值${\cal{F}}_{\rm MZM}=\sqrt{8}/π$,与能量无关。我们还得到了临界MZM占据数${\cal N}_{\rm MZM}$的精确解析结果,它依赖于Catalan常数${\cal G}\approx 0.91596559$,对于基态(${\cal N}_{\rm MZM}=1/2-4{\cal{G}}/π^2\approx 0.12877$)和第一激发态(${\cal N}_{\rm MZM}=1/2+(8-4{\cal{G}})/π^2\approx 0.93934$)均如此。我们进一步计算了有限尺寸修正,这些修正对于临界Kitaev链中配对与跳跃的特殊比率$Δ/t=\sqrt{2}-1$恰好消失。

英文摘要:

Many topological or critical aspects of the Kitaev chain are well known, with several classic results. In contrast, the study of the critical behavior of the strong Majorana zero modes (MZM) has been overlooked. Here we introduce two topological markers which, surprisingly, exhibit non-trivial signatures over the entire (1+1) Ising critical line. We first analytically compute the MZM fidelity ${\cal{F}}_{\rm MZM}$--a measure of the MZM mapping between parity sectors. It takes a universal value along the (1+1) Ising critical line, ${\cal{F}}_{\rm MZM}=\sqrt{8}/π$, independent of the energy. We also obtain an exact analytical result for the critical MZM occupation number ${\cal N}_{\rm MZM}$ which depends on the Catalan's constant ${\cal G}\approx 0.91596559$, for both the ground-state (${\cal N}_{\rm MZM}=1/2-4{\cal{G}}/π^2\approx 0.12877$) and the first excited state (${\cal N}_{\rm MZM}=1/2+(8-4{\cal{G}})/π^2\approx 0.93934$). We further compute finite-size corrections which identically vanish for the special ratio $Δ/t=\sqrt{2}-1$ between pairing and hopping in the critical Kitaev chain.

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。

↑