Gate-defined quantum point contact in an InSb two-dimensional electron gas
Zijin Lei, Christian A. Lehner, Erik Cheah, Christopher Mittag, Matija Karalic, W. Wegscheider, K. Ensslin, Thomas Ihn
Abstract
We investigate an electrostatically defined quantum point contact (QPC) in a high-mobility InSb twodimensional electron gas. Well-defined conductance plateaus are observed, and the subband structure of the QPC is extracted from finite-bias measurements. The Zeeman splitting is measured in both in-plane and out-of-plane magnetic fields. We find an in-plane g factor |g * | 40. The out-of-plane g factor is measured to be |g * | 50, which is close to the g factor in the bulk.
Topics & Concepts
Quantum point contactCondensed matter physicsFermi gasPhysicsZeeman effectElectronPlane (geometry)Filling factorHeliumMagnetic fieldQuantum wellAtomic physicsQuantum mechanicsGeometryMathematicsLaserQuantum and electron transport phenomenaSemiconductor Quantum Structures and DevicesElectronic and Structural Properties of Oxides