Space charge and screening in bilayer graphene

Eugene B. Kolomeisky, Joseph P. Straley, Daniel L. Abrams

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


Undoped bilayer graphene is a two-dimensional semimetal with a low-energy excitation spectrum that is parabolic in the momentum. As a result, the screening of an arbitrary external charge Ze is accompanied by a reconstruction of the ground state: valence band electrons (for Z > 0) are promoted to form a space charge around the charge while the holes leave the physical picture. The outcome is a flat neutral object resembling the regular atom except that for it is described by a strictly linear Thomas-Fermi theory. This theory also predicts that the bilayer's static dielectric constant is the same as that of a two-dimensional electron gas in the long-wavelength limit.

Original languageEnglish
Article number47LT01
JournalJournal of Physics Condensed Matter
Issue number47
StatePublished - Sep 16 2016

Bibliographical note

Funding Information:
This work was supported by US AFOSR Grant No. FA9550- 11-1-0297.

Publisher Copyright:
© 2016 IOP Publishing Ltd.


  • ThomasFermi theory
  • bilayer grapheme
  • screening

ASJC Scopus subject areas

  • Materials Science (all)
  • Condensed Matter Physics


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