Accession Number : ADA329786

Title :   Resonant Tunneling and Hot Electron Spectroscopy in Buried Rare-Earth Arsenide/Semiconductor Heterostructures.

Descriptive Note : Final rept. 1 May 93-30 Apr 97,

Corporate Author : CALIFORNIA UNIV SANTA BARBARA

Personal Author(s) : Allen, S. J.

PDF Url : ADA329786

Report Date : 30 APR 1997

Pagination or Media Count : 7

Abstract : A new materials arena has been opened for quantum electron transport devices based on magnetic, semi-metal compound semiconductor heterostructures. Epitaxial ultrathin films of a rare earth arsenide, ErAs, were grown in GaAs semiconductors. The dissimilarities between the ErAs, a magnetic semimetal, and the compound semiconductor make possible the fabrication of three terminal resonant tunneling transistors with ultra thin semi-metal quantum wells. Resonant tunneling through semi-metal quantum wells was observed for the first time. A strong coupling of the magnetization and the resonant tunneling was discovered that demonstrates magnetization controlled resonant tunneling. Nano-composites of ErAs / GaAs were also grown. Electron transport in these systems exhibits giant magneto-resistance, magnetization controlled island to island electron hopping transport. This research program has opened the possibility of high density, non-volatile information storage and processing based on magnetic, semi-metallic, quantum structures grown and integrated into compound semiconductor heterostructures.

Descriptors :   *HETEROGENEITY, *ARSENIDES, *RARE EARTH ELEMENTS, *HETEROGENEOUS REACTORS, COUPLING(INTERACTION), CONTROL, QUANTUM THEORY, ELECTRON TRANSPORT, QUANTUM WELLS, GALLIUM ARSENIDES, STRUCTURES, METAL FILMS, THIN FILMS, EPITAXIAL GROWTH, SEMICONDUCTORS, RESONANCE, HIGH DENSITY, QUANTUM ELECTRONICS, TUNNELING, MAGNETIZATION, ELECTRON SPECTROSCOPY, ISLANDS.

Subject Categories : Inorganic Chemistry
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE