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537 results on '"SHAM, L. J."'

203. Ultrafast magneto-optics in ferromagnetic III–V semiconductors

Author

Wang, Jigang, primary, Sun, Chanjuan, additional, Hashimoto, Yusuke, additional, Kono, Junichiro, additional, Khodaparast, Giti A, additional, Cywiński, Łukasz, additional, Sham, L J, additional, Sanders, Gary D, additional, Stanton, Christopher J, additional, and Munekata, Hiro, additional

Published
2006
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227. Semiconductor Quantum Dots for Quantum Information Processing: An Optical Approach.

Author

Dutt, M. V. Gurudev, Yanwen Wu, Xiaoqin Li, Steel, D. G., Gammon, D., and Sham, L. J.

Subjects
QUANTUM dots, SEMICONDUCTORS, QUANTUM electronics, ELECTRONICS, SOLID state electronics, SOLID state physics
Abstract

Semiconductor quantum dots (QDs) are ideal candidates for quantum information processing, due to their strong resemblance to atomic systems. This paper will show that an optically driven approach is an attractive scheme for quantum computing with QDs. Results will be presented from the experiments with the optical Bloch vector qubit in neutral QDs, demonstrating phase-locked single qubit rotations and two-qubit universal control-NOT logic gates. We will conclude by discussing how the optical approach can be extended to control the electron spin qubit in charged QDs. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2005
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228. Optically Driven Quantum Computing Devices Based on Semiconductor Quantum Dots.

Author

Everitt, Henry O., Li, Xiaoqin, Steel, Duncan, Gammon, Daniel, and Sham, L. J.

Abstract

This paper concerns optically driven quantum logic devices based on semiconductor quantum dots. It provides a brief review of recent theoretical and experimental progress towards building such devices and a description of a possible direction of further research. We consider both the exciton and the electron spin as a potential qubit. Quantum dot fabrication and single dot spectroscopy studies are briefly discussed followed by a description of experimental demonstrations of basic quantum logic operations. A scheme for a scalable quantum computer based on optical control of electron spins localized in quantum dots is described in detail. Important lessons as well as challenges for future research are summarized. [ABSTRACT FROM AUTHOR]

Published
2005
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239. Discovery of a photoresponse amplification mechanism in compensated PN junctions.

Author

Yuchun Zhou, Yu-Hsin Liu, Rahman, Samia N., Hall, David, Sham, L. J., and Yu-Hwa Lo

Subjects
WAVE amplification, SEMICONDUCTOR junctions, DOPED semiconductors, SILICON, LOW voltage systems, CRYOGENICS
Abstract

We report the experimental evidence of uncovering a photoresponse amplification mechanism in heavily doped, partially compensated silicon p-n junctions under very low bias voltage. We show that the observed photocurrent gain occurs at a bias that is more than an order of magnitude below the threshold voltage for conventional impact ionization. Moreover, contrary to the case of avalanche detectors and p-i-n diodes, the amplified photoresponse is enhanced rather than suppressed with increasing temperature. These distinctive characteristics lead us to hypothesize that the inelastic scattering between energetic electrons (holes) and the ionized impurities in the depletion and charge neutral regions of the p-n junction in a cyclic manner plays a significant role in the amplification process. Such an internal signal amplification mechanism, which occurs at much lower bias than impact ionization and favors room temperature over cryogenic temperature, makes it promising for practical device applications. [ABSTRACT FROM AUTHOR]

Published
2015
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