Tunable superlattice in graphene to control the number of Dirac points.
Superlattice in graphene generates extra Dirac points in the band structure and their number depends on the superlattice potential strength. Here, we have created a lateral superlattice in a graphene device with a tunable barrier height using a combination of two gates. In this Letter, we demonstrate the use of lateral superlattice to modify the band structure of graphene leading to the emergence of new Dirac cones. This controlled modification of the band structure persists up to 100 K.
Department of Condensed Matter Physics and Materials Science and ‡Department of Theoretical Physics, Tata Institute of Fundamental Research , Homi Bhabha Road, Mumbai 400005, India.
Sudipta
S
Dubey
Vibhor
V
Singh
Ajay K
AK
Bhat
Pritesh
P
Parikh
Sameer
S
Grover
Rajdeep
R
Sensarma
Vikram
V
Tripathi
K
K
Sengupta
Mandar M
MM
Deshmukh