Kane-Mele模型中电子-声子相互作用和Rashba自旋-轨道耦合的相互作用

IF 2.8 3区物理与天体物理 Q2 PHYSICS, CONDENSED MATTER

Physica B-condensed Matter Pub Date : 2025-06-14 DOI:10.1016/j.physb.2025.417503

I.V. Sankar, Soma Mukhopadhyay, Sankararao Yadam, Raghavendra Kulkarni, C. Hari Krishna

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引用次数: 0

摘要

在Kane-Mele-Holstein模型的框架内研究了从移动极化子到不移动极化子的量子相变。在变分方法中，利用基于修正Lang-Firsov变换的变分分析消除了模型中的声子自由度，得到了有效的或极化的Kane-Mele模型。然后研究了有效模型，以了解电子-声子相互作用对块状石墨烯和之字形纳米带电子结构的影响。结果表明，在绝热（或反绝热）状态下，量子相变具有显著的带重整化，突变（或连续）性质，并且由于强电子-声子相互作用而破坏了拓扑绝缘行为。

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Interplay of electron-phonon interaction and Rashba spin-orbit coupling in the Kane-Mele model

The quantum phase transition from mobile to immobile polaron within the framework of the Kane-Mele-Holstein model is investigated. The phonon degrees of freedom in the model are eliminated using a variational ansatz based on modified Lang-Firsov transformation within the variational approach to obtain the effective or polaronic Kane-Mele model. The effective model is then studied to understand the effect of electron-phonon interaction on the electronic structure of both bulk graphene and zigzag nanoribbons. The results reveal a significant band renormalization, abrupt (or continuous) nature of the quantum phase transition in the adiabatic (or anti-adiabatic) regime, and the disruption of topological insulating behavior due to strong electron-phonon interaction.

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来源期刊

Physica B-condensed Matter 物理-物理：凝聚态物理

CiteScore

4.90

自引率

7.10%

发文量

703

审稿时长

44 days

期刊介绍： Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work. Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas: -Magnetism -Materials physics -Nanostructures and nanomaterials -Optics and optical materials -Quantum materials -Semiconductors -Strongly correlated systems -Superconductivity -Surfaces and interfaces