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arXiv 2107.08487cond-mat.mes-hallmath-phmath.MPquant-ph
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应变蜂窝晶格中色散伪朗道能级的相干态

Coherent states for dispersive pseudo-Landau-levels in strained honeycomb lattices

Erik Díaz-Bautista, Maurice Oliva-Leyva

摘要:

石墨烯中的狄拉克费米子由于均匀的伪磁场和由应变引起的位置相关的费米速度而可能经历色散的伪朗道能级。本文从相干态的角度研究了这些粒子在这种物理背景下的(半经典)动力学。为此,我们利用类Landau规范,通过非幺正位移算符$D(α)$作用于系统的基态,建立了Perelomov相干态.我们分析了相干态的几率密度随时间的演化和广义不确定原理以及Wigner函数。我们的结果显示了$x$ -动量依赖性如何影响相空间中的运动周期性和Wigner函数形状。

英文摘要:

Dirac fermions in graphene may experiment dispersive pseudo-Landau levels due to a homogeneous pseudomagnetic field and a position-dependent Fermi velocity induced by strain. In this paper, we study the (semi-classical) dynamics of these particles under such a physical context from an approach of coherent states. For this purpose we use a Landau-like gauge to built Perelomov coherent states by the action of a non-unitary displacement operator $D(α)$ on the fundamental state of the system. We analyze the time evolution of the probability density and the generalized uncertainty principle as well as the Wigner function for the coherent states. Our results show how $x$-momentum dependency affects the motion periodicity and the Wigner function shape in phase space.

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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