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Coulomb drag study of dynamic screening in graphene inhomogeneous bilayer system

Year: 2025
Type: article
Abstract: We study coulomb drag phenomena in graphene-based electron-electron bilayer systems described by insulated non-interacting massless fermions. Non-zero frequency-dependent dynamic screening is considered to include the correlations using the random phase approximation (RPA) method for long-range and weak interaction limits. Analytically, the frequency-dependent response function is presented at finite and non-finite temperatures to consider the dynamic screening. At low temperatures, drag resistivity shows the 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 ≥20% enhanced drag resistivity compared to static. Similarly, dynamic screening at a finite temperature also results in a significant enhancement and qualitative change. The structure concern for nonhomogeneous dielectric medium (NHDM) is also studied to consider the substrate and uppermost layer screening. The introduction of NHDM structure finds a marked improvement compared to homogeneous dielectric medium (HDM).
DOI: 10.1016/j.physleta.2025.130420
Institution: University of Padua
Language: English
Open Access status: hybrid
Estimated APC paid: $2,150
OpenAlex ID: W4408354659
FWCI:
Cites: 72
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Related to: 10