Gate-defined quantum point contact in an InAs two-dimensional electron gas
- Christopher Mittag ,
- Matija Karalic ,
- Zijin Lei ,
- Candice Thomas ,
- Aymeric Tuaz ,
- Anthony T. Hatke ,
- Geoff Gardner ,
- Professor Michael J Manfra ,
- Thomas Ihn ,
- Klaus Ensslin
Physical Review B | , Vol 100(7): pp. 75422
We experimentally study quantized conductance in an electrostatically defined constriction in a high-mobility InAs two-dimensional electron gas. A parallel magnetic field lifts the spin degeneracy and allows for the observation of plateaus in integer multiples of ${e}^{2}/h$. Upon the application of a perpendicular magnetic field, spin-resolved magnetoelectric subbands are visible. Through finite bias spectroscopy we measure the subband spacings in both parallel and perpendicular direction of the magnetic field and determine the $g$ factor.