Ruchi Saxena

Ruchi Saxena

Research Fellow
PhD (Harish-Chandra Research Institute, India)
+44 (0)1483 689831
05 ATI 01

Academic and research departments

Department of Physics, Advanced Technology Institute.


Ruchi Saxena, Eytan Grosfeld, Sebastian E. de Graaf, Tobias Lindstrom, Floriana Lombardi, Oindrila Deb, Eran Ginossar (2022)Electronic confinement of surface states in a topological insulator nanowire, In: Physical review B106(3)035407pp. 035407-1-035407-9 American Physical Society

We analyze the confinement of electronic surface states in a model of a topological insulator nanowire. Spin-momentum locking in the surface states reduces unwanted backscattering in the presence of nonmagnetic disorder and is known to counteract localization for certain values of magnetic flux threading the wire. We show that intentional backscattering can be induced for a range of conditions in the presence of a nanowire constriction. We propose a geometry for a nanowire that involves two constrictions and show that these regions form effective barriers that allow for the formation of a quantum dot. We analyze the zero-temperature noninteracting electronic transport through the device using the Landauer-B??ttiker approach and show how externally applied magnetic flux parallel to the nanowire and electrostatic gates can be used to control the spectrum of the quantum dot and the electronic transport through the surface states of the model device.