Anomalous screening in two-dimensional materials with an extremum ring in the dispersion law

Eugene B. Kolomeisky, Joseph P. Straley

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

A variety of two-dimensional materials possess a band structure with an energy extremal ridge along a ring in momentum space. Examples are biased bilayer graphene and surfaces and interfaces with a Rashba spin-orbit interaction where at low doping the carriers fill an annulus. This topological feature causes an anomalous screening behavior, which we study using the Thomas-Fermi theory. Specifically, reducing the doping is predicted to enhance the linear screening response, whereas at zero doping the size of the screening cloud surrounding a Coulomb impurity is found to increase as the cube root of the impurity charge.

Original languageEnglish
Article number245150
JournalPhysical Review B
Volume94
Issue number24
DOIs
StatePublished - Dec 30 2016

Bibliographical note

Publisher Copyright:
© 2016 American Physical Society.

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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