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arXiv 1103.2018cond-mat.str-el
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莫特绝缘体中掺杂载流子的非平衡量子动力学

Nonequilibrium quantum dynamics of a charge carrier doped into a Mott insulator

Marcin Mierzejewski, Lev Vidmar, Janez Bonca, Peter Prelovsek

摘要:

本文研究了引入到非掺杂莫特绝缘体中的载流子在恒定电场F作用下在t-J梯形和正方形晶格上的实时动力学行为。我们计算准稳态电流。在这两个系统中,观察到绝热制度,其次是正微分电阻率(PDR)在中等领域的载流子迁移率确定。当在大磁场下两个系统都进入负微分电阻率(NDR)区域时,梯形和二维(2D)系统之间出现定量差异。在梯形系统中,布洛赫振荡占主导地位,而在2D中,电流保持有限,与1/F成比例。在2D中PDR和NDR区域之间的交叉伴随着传播自旋极化子的空间结构的变化。

英文摘要:

We study real-time dynamics of a charge carrier introduced into undoped Mott insulator propagating under a constant electric field F on the t-J ladder and square lattice. We calculate quasistationary current. In both systems adiabatic regime is observed followed by the positive differential resistivity (PDR) at moderate fields where carrier mobility is determined. Quantitative differences between ladder and 2-dimensional (2D) system emerge when at large fields both systems enter negative differential resistivity (NDR) regime. In the ladder system Bloch-like oscillations prevail, while in 2D the current remains finite, proportional to 1/F. The crossover between PDR and NDR regime in 2D is accompanied by a change of the spatial structure of the propagating spin polaron.

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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