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Calendar: ALS Calendar
Title: ALS-CXRO Seminar | Keun Su Kim
When: 10/24/2012 3:00 PM - 4:00 PM
Description: ALS-CXRO Seminar Series

Wed, Oct 24, 2012
6-2202 (please note conference room change)

Sung-Kwan Mo

Presented by:
Keun Su Kim

Novel Dirac spectrum of quasi-freestanding bilayer graphene

Bilayer graphene is a prototypical two-dimensional material whose electronic structure and properties (e.g. energy gap) are controllable by breaking its symmetry. The most widely accepted theoretical model to describe charge carriers in bilayer graphene is “massive Dirac fermions”, characterized by a nearly parabolic band pair touching each other at the charge-neutrality point. In this talk, I will introduce angle-resolved photoemission studies on quasi-freestanding bilayer graphene, which show an unexpected electronic spectrum, consisting of both massive and massless Dirac fermions. The latter has a unique band topology with a chiral pseudospin texture, and its origin will be discussed in terms of symmetry breaking induced by a native imperfection of bilayer graphene.
Location: 6-2202-CR(20)