Coulomb drag study of dynamic screening in graphene inhomogeneous bilayer system

IF 2.3 3区物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY

Physics Letters A Pub Date : 2025-03-12 DOI:10.1016/j.physleta.2025.130420

Sharad Kumar Upadhyay

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引用次数: 0

Abstract

We study coulomb drag phenomena in doped-graphene based electron-electron (e-e) bilayer systems described by non-interacting massless Dirac fermions separated by an insulating layer. The non-zero frequency dependent dynamic screening is taken into account to include the correlations between the two layer using the random phase approximation (RPA) method for long-range and weak interaction limits. Analytically, the frequency-dependent/dynamic response function is presented at finite and non-finite temperatures to consider the dynamic screening. At low temperatures, drag resistivity shows an usual Fermi-liquid behavior. However, a marked improvement has been found in the predictions of the conventional static interaction. Zero-temperature dependent dynamic screening results show

\geq 20 %

enhanced drag resistivity (

ρ_{D}

) compared to static. Similarly, the dynamic screening at finite temperature result in a significant enhancement and qualitative change than non-finite temperature. The structure concern to non-homogeneous dielectric medium (NHDM) is also studied to consider the screening effects of substrate and uppermost layer into account. The introduction of NHDM structure finds a marked improvement compared to homogeneous dielectric medium (HDM).

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来源期刊

Physics Letters A 物理-物理：综合

CiteScore

5.10

自引率

3.80%

发文量

493

审稿时长

30 days

期刊介绍： Physics Letters A offers an exciting publication outlet for novel and frontier physics. It encourages the submission of new research on: condensed matter physics, theoretical physics, nonlinear science, statistical physics, mathematical and computational physics, general and cross-disciplinary physics (including foundations), atomic, molecular and cluster physics, plasma and fluid physics, optical physics, biological physics and nanoscience. No articles on High Energy and Nuclear Physics are published in Physics Letters A. The journal''s high standard and wide dissemination ensures a broad readership amongst the physics community. Rapid publication times and flexible length restrictions give Physics Letters A the edge over other journals in the field.