skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Magnetoelectric effect in bilayer graphene controlled by valley-isospin density

Abstract

We show that bilayer graphene (BLG) exhibits magnetoelectric (ME) effects that are formally similar to those commonly seen in band insulators with broken inversion and time-reversal symmetries. Three unusual features characterize the ME responses exhibited by BLG: (i) unlike most other ME media, BLG is a conductor, (ii) BLG has a nonquantized ME coupling even though its electronic structure does not break parity and time-reversal symmetry, and (iii) the magnitude of the ME coupling in BLG is determined by the valley-isospin density, which can be manipulated experimentally. This last property also enables a purely electric measurement of valley-isospin densities. While our theoretical arguments use BLG as an example, they are generally valid for any material with similar symmetries

Authors:
;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
National Science Foundation (NSF); USDOE Office of Science - Office of Basic Energy Sciences - Materials Sciences and Engineering Division
OSTI Identifier:
1352840
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. B, Condensed Matter and Materials Physics; Journal Volume: 90; Journal Issue: 12
Country of Publication:
United States
Language:
English

Citation Formats

Zülicke, U., and Winkler, R. Magnetoelectric effect in bilayer graphene controlled by valley-isospin density. United States: N. p., 2014. Web. doi:10.1103/PhysRevB.90.125412.
Zülicke, U., & Winkler, R. Magnetoelectric effect in bilayer graphene controlled by valley-isospin density. United States. doi:10.1103/PhysRevB.90.125412.
Zülicke, U., and Winkler, R. Mon . "Magnetoelectric effect in bilayer graphene controlled by valley-isospin density". United States. doi:10.1103/PhysRevB.90.125412.
@article{osti_1352840,
title = {Magnetoelectric effect in bilayer graphene controlled by valley-isospin density},
author = {Zülicke, U. and Winkler, R.},
abstractNote = {We show that bilayer graphene (BLG) exhibits magnetoelectric (ME) effects that are formally similar to those commonly seen in band insulators with broken inversion and time-reversal symmetries. Three unusual features characterize the ME responses exhibited by BLG: (i) unlike most other ME media, BLG is a conductor, (ii) BLG has a nonquantized ME coupling even though its electronic structure does not break parity and time-reversal symmetry, and (iii) the magnitude of the ME coupling in BLG is determined by the valley-isospin density, which can be manipulated experimentally. This last property also enables a purely electric measurement of valley-isospin densities. While our theoretical arguments use BLG as an example, they are generally valid for any material with similar symmetries},
doi = {10.1103/PhysRevB.90.125412},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 12,
volume = 90,
place = {United States},
year = {Mon Sep 01 00:00:00 EDT 2014},
month = {Mon Sep 01 00:00:00 EDT 2014}
}