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Type II broken-gap quantum wires and quantum dot arrays: A novel concept for self-doping semiconductor nanostructures

Sercel, Peter C. and Vahala, Kerry J. (1990) Type II broken-gap quantum wires and quantum dot arrays: A novel concept for self-doping semiconductor nanostructures. Applied Physics Letters, 57 (15). pp. 1569-1571. ISSN 0003-6951. http://resolver.caltech.edu/CaltechAUTHORS:SERapl90b

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Abstract

A novel concept for creating self-doping quantum wires and quantum dot arrays based upon the InAs-GaSb material system is proposed. The unusual type II, broken-gap band line-up in this system allows charge transfer across the InAs-GaSb interfaces. We employ a recently developed coupled band formalism to examine analytically the band structure of InAs-GaSb quantum dots and wires. The analysis shows that appropriately engineered nanostructures which contain high free-carrier densities are possible without intentional impurity doping. Quantum dots in this system behave as artificial quasiatoms, with ionization energy and valence determined by fabricationally determined parameters. Synthetic p-(n-)type semiconductors may therefore be formed from arrays of InAs(GaSb) quantum dots embedded in GaSb(InAs). InAs-GaSb quantum wires are also investigated and found to exhibit self-doping behavior. Possible fabrication schemes utilizing recently developed technologies are discussed.


Item Type:Article
Additional Information:© 1990 American Institute of Physics (Received 16 April 1990; accepted 17 July 1990) This work was supported by grants from the Office of Naval Research and the National Science Foundation, PCS would like to acknowledge a National Science Foundation graduate fellowship.
Subject Keywords:ENERGY GAP; INDIUM ARSENIDES; GALLIUM ANTIMONIDES; QUANTUM WELL STRUCTURES; WIRES; BAND STRUCTURE; VALENCE BANDS; INTERFACE STRUCTURE; FABRICATION; MICROELECTRONICS
Record Number:CaltechAUTHORS:SERapl90b
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SERapl90b
Alternative URL:http://dx.doi.org/10.1063/1.103356
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6325
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:01 Dec 2006
Last Modified:26 Dec 2012 09:20

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