莫伊里石墨烯中的低能光学和规则

IF 8.1 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
J. F. Mendez-Valderrama, Dan Mao, Debanjan Chowdhury
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引用次数: 0

摘要

小扭曲角的少层石墨烯已成为研究单粒子动能接近熄灭和非难带拓扑状态下强相互作用问题的迷人平台。我们从扭曲双层石墨烯的强耦合极限出发,利用消失的单电子带宽和相同亚晶格位点之间的层间隧道,提出了所有整数填充下库仑相互作用诱导的低能光学光谱权重的精确分析理论。在此极限下,虽然相互作用诱导的单粒子色散是有限的,但光学光谱权重在整数填充时完全消失。我们通过系统地将实验相关的应变诱导的单电子带宽重正化和相同亚晶格位点之间的层间隧道效应纳入其中,研究了对光学光谱权的修正。鉴于光学光谱权重与控制超导𝑇𝑐的二磁响应之间的关系,我们的结果突出了特定母体绝缘相在掺杂远离整数填充时增强超导倾向的相对重要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Low-Energy Optical Sum Rule in Moiré Graphene
Few layers of graphene at small twist angles have emerged as a fascinating platform for studying the problem of strong interactions in regimes with a nearly quenched single-particle kinetic energy and nontrivial band topology. Starting from the strong-coupling limit of twisted bilayer graphene with a vanishing single-electron bandwidth and interlayer tunneling between the same sublattice sites, we present an exact analytical theory of the Coulomb interaction-induced low-energy optical spectral weight at all integer fillings. In this limit, while the interaction-induced single-particle dispersion is finite, the optical spectral weight vanishes identically at integer fillings. We study corrections to the optical spectral weight by systematically including the effects of experimentally relevant strain-induced renormalization of the single-electron bandwidth and interlayer tunnelings between the same sublattice sites. Given the relationship between the optical spectral weight and the diamagnetic response that controls superconducting 𝑇𝑐, our results highlight the relative importance of specific parent insulating phases in enhancing the tendency towards superconductivity when doped away from integer fillings.
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来源期刊
Physical review letters
Physical review letters 物理-物理:综合
CiteScore
16.50
自引率
7.00%
发文量
2673
审稿时长
2.2 months
期刊介绍: Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks
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