title: Electron emission from a semiconductor quantum ring under normally incident radiation.
abstract: In this paper we investigate the current density due to electrons emitted during normal irradiation of a toroidal quantum ring of a strongly degenerate wide-gap semiconductor. The computed results show that the current density increases in a step-like manner with increase in the incident photon energy. Increased current density can be obtained by reducing the dimensions of the ring. The threshold energy for photoemission becomes an oscillatory function of the cross-sectional radius, and can be used as an important tool for monitoring parameters such as the cross-sectional radius and doping density. The threshold energy is, however, independent of the circumference of the ring.
authors.affiliation: Birla Institute of Technology, 56 B T Road, Kolkata 700 050, India.
authors.forename: Susmita
authors.initials: S
authors.lastname: Sen
authors.forename: N R
authors.initials: NR
authors.lastname: Das
authors.forename: A N
authors.initials: AN
authors.lastname: Chakravarti