TY - JOUR
T1 - Optical conductivity of a commensurate graphene-topological insulator heterostructure
AU - Sanderson, Matthew
AU - Huang, Sunchao
AU - Bao, Qiaoliang
AU - Zhang, Chao
PY - 2017/9/27
Y1 - 2017/9/27
N2 - The optical conductivity of a heterostructure formed by a commensurate stacking of graphene and a topological insulator (TI) is investigated using the Kubo formalism. Both the intra- and interband AC conductivities are found to be sensitive to the graphene-TI coupling. The direct interband transition in graphene which is the origin of the universal conductance is forbidden due to the topological nature is the coupling. Furthermore, the graphene-TI coupling gives rise to additional broken symmetries, resulting in both the inter- and intraband conductivity to be reduced in the graphene-TI heterostructure. By varying the Fermi energy of the heterostructure, the band that gives the largest contribution changes, which in turn affects the overall electronic transport.
AB - The optical conductivity of a heterostructure formed by a commensurate stacking of graphene and a topological insulator (TI) is investigated using the Kubo formalism. Both the intra- and interband AC conductivities are found to be sensitive to the graphene-TI coupling. The direct interband transition in graphene which is the origin of the universal conductance is forbidden due to the topological nature is the coupling. Furthermore, the graphene-TI coupling gives rise to additional broken symmetries, resulting in both the inter- and intraband conductivity to be reduced in the graphene-TI heterostructure. By varying the Fermi energy of the heterostructure, the band that gives the largest contribution changes, which in turn affects the overall electronic transport.
KW - grapheme
KW - optical conductivity
KW - topological insulator
UR - http://www.scopus.com/inward/record.url?scp=85028911274&partnerID=8YFLogxK
U2 - 10.1088/1361-6463/aa81a7
DO - 10.1088/1361-6463/aa81a7
M3 - Article
AN - SCOPUS:85028911274
SN - 0022-3727
VL - 50
JO - Journal of Physics D: Applied Physics
JF - Journal of Physics D: Applied Physics
IS - 38
M1 - 385301
ER -