二维材料中的应变可调超导性

IF 2.4 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications Pub Date : 2025-10-08 DOI:10.1016/j.ssc.2025.116180

Farshad Azizi

引用次数: 0

摘要

我们开发了一个统一的理论框架来研究二维材料中的应变可调超导性，扩展了bardeen - coopero - schrieffer （BCS）的形式，包括应变相关的配对相互作用、态密度（DOS）和自旋轨道耦合（SOC）。针对石墨烯和过渡金属二硫族化物（TMDs）等六边形晶格，我们的模型集成了张量应变效应、能带平坦化和SOC，推导出超导间隙（Δ（λ））和临界温度（Tc(λ)）的解析表达式。与之前的模型不同，它捕获了各向异性和晶格特异性效应的相互作用，预测了超导性的非单调增强，达到5%的应变，MoS2的峰值Δ≈1.197meV和Tc≈3.16K，与实验数据一致。在DFT和自洽模拟的支持下，我们的框架指导应变工程量子器件。

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Strain-tunable superconductivity in 2D materials

We develop a unified theoretical framework to investigate strain-tunable superconductivity in 2D materials, extending the Bardeen–Cooper–Schrieffer (BCS) formalism with strain-dependent pairing interactions, density of states (DOS), and spin–orbit coupling (SOC). Tailored to hexagonal lattices like graphene and transition metal dichalcogenides (TMDs), our model integrates tensor strain effects, band flattening, and SOC to derive analytical expressions for the superconducting gap (

Δ (ϵ)

) and critical temperature (

T_{c} (ϵ)

). Unlike previous models, it captures the interplay of anisotropy and lattice-specific effects, predicting a non-monotonic enhancement of superconductivity up to 5% strain, with peak

Δ \approx 1.197 meV

and

T_{c} \approx 3.16 K

for MoS

_{2}

, consistent with experimental data. Supported by DFT and self-consistent simulations, our framework guides strain-engineered quantum devices.

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来源期刊

Solid State Communications 物理-物理：凝聚态物理

CiteScore

3.40

自引率

4.80%

发文量

287

审稿时长

51 days

期刊介绍： Solid State Communications is an international medium for the publication of short communications and original research articles on significant developments in condensed matter science, giving scientists immediate access to important, recently completed work. The journal publishes original experimental and theoretical research on the physical and chemical properties of solids and other condensed systems and also on their preparation. The submission of manuscripts reporting research on the basic physics of materials science and devices, as well as of state-of-the-art microstructures and nanostructures, is encouraged. A coherent quantitative treatment emphasizing new physics is expected rather than a simple accumulation of experimental data. Consistent with these aims, the short communications should be kept concise and short, usually not longer than six printed pages. The number of figures and tables should also be kept to a minimum. Solid State Communications now also welcomes original research articles without length restrictions. The Fast-Track section of Solid State Communications is the venue for very rapid publication of short communications on significant developments in condensed matter science. The goal is to offer the broad condensed matter community quick and immediate access to publish recently completed papers in research areas that are rapidly evolving and in which there are developments with great potential impact.