Quantized Conductance and Large g-Factor Anisotropy in InSb Quantum Point Contacts.
Because of a strong spin-orbit interaction and a large Landé g-factor, InSb plays an important role in research on Majorana fermions. To further explore novel properties of Majorana fermions, hybrid devices based on quantum wells are conceived as an alternative approach to nanowires. In this work, we report a pronounced conductance quantization of quantum point contact devices in InSb/InAlSb quantum wells. Using a rotating magnetic field, we observe a large in-plane (|g1| = 26) and out-of-plane (|g1| = 52) g-factor anisotropy. Additionally, we investigate crossings of subbands with opposite spins and extract the electron effective mass from magnetic depopulation of one-dimensional subbands.
QuTech and Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands.
Fanming
F
Qu
QuTech and Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands.
Jasper
J
van Veen
QuTech and Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands.
Folkert K
FK
de Vries
QuTech and Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands.
Arjan J A
AJ
Beukman
QuTech and Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands.
Michael
M
Wimmer
HRL Laboratories, 3011 Malibu Canyon Road, Malibu, California 90265, United States.
Wei
W
Yi
HRL Laboratories, 3011 Malibu Canyon Road, Malibu, California 90265, United States.
Andrey A
AA
Kiselev
HRL Laboratories, 3011 Malibu Canyon Road, Malibu, California 90265, United States.
Binh-Minh
BM
Nguyen
HRL Laboratories, 3011 Malibu Canyon Road, Malibu, California 90265, United States.
Marko
M
Sokolich
Department of Physics and Astronomy, and Station Q Purdue, School of Electrical and Computer Engineering, School of Materials Engineering, Purdue University , West Lafayette, Indiana 47907, United States.
Michael J
MJ
Manfra
Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen , Copenhagen 1017, Denmark.
Fabrizio
F
Nichele
Center for Quantum Devices, Niels Bohr Institute, University of Copenhagen , Copenhagen 1017, Denmark.
Charles M
CM
Marcus
QuTech and Kavli Institute of Nanoscience, Delft University of Technology , 2600 GA Delft, The Netherlands.
Leo P
LP
Kouwenhoven
InSb quantum well; conductance quantization; electron effective mass; g-factor anisotropy; quantum point contact