Quantum real-space transfer in semiconductor heterostructures

Abstract

Quantum real-space transfer of carriers in semiconductor heterostructures, which relies solely on the wave nature of electrons governed by quantum mechanics, is investigated. In quantum-well structures where electron effective mass varies spatially, the confined electron wave function can be modified by changing the longitudinal momentum via an external electric field parallel to the quantum-well plane. This shifts electrons perpendicularly to another layer having a different effective mass. Issues associated with realistic scattering are identified for unambiguously demonstrating this quantum real-space transfer in practical situations. Specific quantum-well structures for realizing the quantum real-space transfer are proposed with calculations. Potential applications of the quantum real-space transfer are discussed.