Accession Number:

ADA235298

Title:

Quantum Devices and Structures.

Descriptive Note:

Final rept. 25 Jul 1990-24 Jan 1991

Corporate Author:

SCIENTIFIC RESEARCH ASSOCIATES INC GLASTONBURY CT

Personal Author(s):

• Grubin, H. L.
• Govindan, T. R.

Report Date:

1991-03-26

Pagination or Media Count:

35.0

Abstract:

All devices constructed from quantum mechanical resonant tunneling structures are dependent upon their ability to move charge in and out of the quantum well. The ability to effectively modulate this charge is dependent upon the device structure which in turn depends upon an understanding of quantum device physics which in turn depends upon device theory, simulation, and experiment. In the present study, Scientific Research Associates, Inc. implemented its time-dependent quantum Liouville equation algorithm for obtaining the density matrix in the coordinate representation. Switching times as well as response times to ac signals were determined for tunneling structures with variable charge densities. A recommended future program involves implementing the algorithm for designing three proto-typical tunneling devices, and determining the limits of operation. These devices are 1 a resonant tunneling self-excited, high-frequency local oscillator, 2 a resonant tunneling high-speed photo-induced two-terminal electrical switching element, and 3 a permeable base like resonant tunneling high current-level three terminal switching transistor.

Descriptors:

• *ALGORITHMS
• SIMULATION
• EXCITATION
• QUANTUM THEORY
• STRUCTURES
• ALTERNATING CURRENT
• VARIABLES
• PHYSICS
• RESPONSE
• SIGNALS
• COORDINATES
• RESONANCE
• SELF OPERATION
• QUANTUM ELECTRONICS
• CHARGE DENSITY
• TUNNELING
• SWITCHING
• OSCILLATORS

Subject Categories:

• Quantum Theory and Relativity

Distribution Statement:

APPROVED FOR PUBLIC RELEASE