Anomalous Spectral Features of a Neutral Bilayer Graphene

Overview

Journal Sci Rep

Specialty Science

Date 2015 May 19

PMID 25985064

Authors

C-M Cheng

L F Xie

A Pachoud

H O Moser

W Chen

A T S Wee

A H Castro Neto

K-D Tsuei

B Ozyilmaz

Affiliations

Soon will be listed here.

Abstract

Graphene and its bilayer are two-dimensional systems predicted to show exciting many-body effects near the neutrality point. The ideal tool to investigate spectrum reconstruction effects is angle-resolved photoemission spectroscopy (ARPES) as it probes directly the band structure with information about both energy and momentum. Here we reveal, by studying undoped exfoliated bilayer graphene with ARPES, two essential aspects of its many-body physics: the electron-phonon scattering rate has an anisotropic k-dependence and the type of electronic liquid is non-Fermi liquid. The latter behavior is evident from an observed electron-electron scattering rate that scales linearly with energy from 100 meV to 600 meV and that is associated with the proximity of bilayer graphene to a two-dimensional quantum critical point of competing orders.

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