Nonequilibrium Quantum Dynamics of a Charge Carrier Doped into a Mott Insulator

被引：52

作者：

Mierzejewski, M. ^{[1
,2
]}

Vidmar, L. ^{[2
]}

Bonca, J. ^{[2
,3
]}

Prelovsek, P. ^{[2
,3
]}

机构：

[1] Univ Silesia, Inst Phys, PL-40007 Katowice, Poland

[2] Jozef Stefan Inst, SI-1000 Ljubljana, Slovenia

[3] Univ Ljubljana, FMF, Dept Phys, SI-1000 Ljubljana, Slovenia

来源：

PHYSICAL REVIEW LETTERS | 2011年 / 106卷 / 19期

关键词：

T-J MODEL; TIME EVOLUTION; ELECTRON; LATTICE;

D O I：

10.1103/PhysRevLett.106.196401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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

引用

页数：4

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