Mobile small bipolarons on a three-dimensional cubic lattice

被引：9
|
作者：
Davenport, A. R. [1 ]
Hague, J. P. [1 ]
Kornilovitch, P. E. [2 ]
机构：
[1] Open Univ, Dept Phys Sci, Milton Keynes MK7 6AA, Bucks, England
[2] Hewlett Packard Corp, Corvallis, OR 97330 USA
来源：
PHYSICAL REVIEW B | 2012年 / 86卷 / 03期
基金：
英国工程与自然科学研究理事会;
关键词：
HIGH-TEMPERATURE SUPERCONDUCTIVITY; MODEL;
D O I：
10.1103/PhysRevB.86.035106
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We use numerically exact quantum Monte Carlo (QMC) to compute the properties of three-dimensional bipolarons for interaction strengths where perturbation theory fails. For intermediate electron-phonon coupling and Hubbard U, we find that bipolarons can be both small and light, a prerequisite for bipolaron superconductivity. We use the QMC results to make estimates of transition temperatures, which peak at between 90-120 K and are demonstrated to be insensitive to Coulomb repulsion and impurities.
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收藏
页数：11
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