Renormalization of the band gap in 2D materials near an interface between two dielectrics

2023/06/07 by Alessandra Nascimento Braga, Wagner P. Pires, Braga, Alessandra N. +7
Engineering · Materials Science · Physics and Astronomy · #Electronic and Structural Properties of Oxides #FOS: Physical sciences #High Energy Physics - Theory (hep-th) #Materials Science (cond-mat.mtrl-sci) #Semiconductor materials and devices #Surface and Thin Film Phenomena

paper · pdf · doi:10.48550/arxiv.2306.04759

openalex publication_date 2023/06/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We investigate how the renormalization of the band gap in a planar 2D material is affected by the consideration of two nondispersive semi-infinite dielectrics, with dielectric constants ε₁ and ε₂, separated by a planar interface. Using the pseudo quantum electrodynamics to model the Coulomb interaction between electrons, we show how the renormalization of the band gap depends on ε₁ and ε₂, and also of the distance between the 2D material and the interface between the two dielectrics. In the appropriate limits, our results reproduce those found in the literature for the band gap renormalization when a single dielectric medium is considered.

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