TY - JOUR

T1 - Wannier Diagrams for Semiconductor Artificial Graphene

AU - Tkachenko, O. A.

AU - Tkachenko, V. A.

AU - Baksheev, D. G.

AU - Sushkov, O. P.

N1 - Funding Information: This work was supported by the Russian Science Foundation, project no. 19-72-30023. Funding Information: We are grateful to O. Klochan, D.Q. Wang, Z.E. Krix, and A.R. Hamilton (University of New South Wales, Sydney, Australia) for stimulating discussion. We acknowledge resources provided by the Joint Supercomputer Center, Russian Academy of Sciences. Publisher Copyright: © 2022, The Author(s).

PY - 2022/11

Y1 - 2022/11

N2 - Quantum transport has been simulated in hexagonal semiconductor lattices of antidots with a period of 80 nm and short-range disorder. Wannier diagrams, i.e., DoS(n, B) maps of the density of states, where n is the electron density and B is the magnetic field strength, have been calculated for several potential modulation amplitudes comparable to or much larger than the Fermi energy. Deep dips in the maps of the density of states have the form of rays with positive, zero, and negative slopes. In addition to the fan of the rays separating the first and second, as well as the second and third Landau levels, the maps include rays that are parallel to them and are shifted in n and B by integers of the characteristic electron density n0 and the characteristic magnetic field strength B0, respectively. It has been shown that the sign and magnitude of the slope of the rays in the density of states correspond to the centers of the plateaus of quantized Hall resistances Rxy. The lattice is brightly manifested in the Rxy(n, B) maps as the replicas of the first and second plateaus in Rxy and as oscillations of Rxy between negative and positive values at a fixed magnetic field or a fixed electron density, which indicates the interchange between the hole and electron charge carriers.

AB - Quantum transport has been simulated in hexagonal semiconductor lattices of antidots with a period of 80 nm and short-range disorder. Wannier diagrams, i.e., DoS(n, B) maps of the density of states, where n is the electron density and B is the magnetic field strength, have been calculated for several potential modulation amplitudes comparable to or much larger than the Fermi energy. Deep dips in the maps of the density of states have the form of rays with positive, zero, and negative slopes. In addition to the fan of the rays separating the first and second, as well as the second and third Landau levels, the maps include rays that are parallel to them and are shifted in n and B by integers of the characteristic electron density n0 and the characteristic magnetic field strength B0, respectively. It has been shown that the sign and magnitude of the slope of the rays in the density of states correspond to the centers of the plateaus of quantized Hall resistances Rxy. The lattice is brightly manifested in the Rxy(n, B) maps as the replicas of the first and second plateaus in Rxy and as oscillations of Rxy between negative and positive values at a fixed magnetic field or a fixed electron density, which indicates the interchange between the hole and electron charge carriers.

UR - http://www.scopus.com/inward/record.url?scp=85143424264&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/a7643362-c982-30bc-b030-a8807c626011/

U2 - 10.1134/S0021364022602020

DO - 10.1134/S0021364022602020

M3 - Article

AN - SCOPUS:85143424264

VL - 116

SP - 638

EP - 642

JO - JETP Letters

JF - JETP Letters

SN - 0021-3640

IS - 9

ER -