Electron Transport in Semiconductor Nanostructures
Electron Transport in Semiconductor Nanostructures
批准号:
9802242
负责人:
Robert Westervelt
金额:
$27.0万
依托单位:
依托单位国家:
美国
项目类别:
Continuing Grant
财政年份:
1998
资助国家:
美国
项目状态:
已结题
起止时间:
1998-08-15 至 2001-07-31
中文摘要
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英文摘要
w:\awards\awards96\*.doc 9802242 Westervelt This experimental research project investigates the behavior of electrons in tunnel-coupled quantum dots. In an apt analogy, such systems can be regarded as artificial molecules, the individual dots being considered as atoms. The fundamental characteristics of electrons in these systems; how electrons are shared between dots, the energy of shared electron states, and how electrons move through coupled dot circuits; are of interest. Specific measurements include Coulomb blockade spectroscopy of small tunnel-coupled dots (less than 100 electrons per dot); Coulomb blockade spectroscopy of tunnel-coupled dots in the quantum Hall regime; transport through single quantum dots with partially open leads, predicted to show interesting many body effects; and transport through open electron wave resonators. Dot samples are made at Harvard using electron beam lithography on GaAs/AlGaAs wafers grown via molecular beam epitaxy at Univ. California Santa Barbara. This research program is interdisciplinary in nature and involves one or more graduate students, who receive excellent training in preparation for careers in industry, government laboratories or academia. %%% This experimental research project investigates the behavior of electrons in semiconductor quantum dots coupled by quantum- mechanical electron tunneling. In an apt analogy, such systems can be regarded as artificial molecules, the individual dots being considered as atoms. The "quantum dot" is a small region in the surface of a GaAs/AlGaAs wafer, similar to those used in advanced microelectronic devices. A two-dimensional electron gas is produced just below the surface of the entire wafer, and then miniature electrodes are deposited using electron beam lithography which can isolate a tiny region containing as few as 100 electrons, called a qu antum dot. The fundamental characteristics of electrons in these systems; how electrons are shared between dots, the energy of shared electron states, and how electrons move through coupled dot circuits, are of interest. Specific measurements include Coulomb blockade spectroscopy of small tunnel-coupled dots (less than 100 electrons per dot); Coulomb blockade spectroscopy of tunnel-coupled dots in the quantum Hall regime; transport through single quantum dots with partially open leads, predicted to show interesting many body effects; and transport through open electron wave resonators. Dot samples are made at Harvard using electron beam lithography on GaAs/AlGaAs wafers grown via molecular beam epitaxy at Univ. California Santa Barbara. The research is relevant to future electronics in which devices will approach the size of large molecules. At this size scale quantum mechanics is important even at room temperature. Quantum phenomena offer new approaches to computation ranging from ultra dense single-electron memories to quantum computers projected to give an exponential increase in speed. The research here addresses the fundamental characteristics of quantum mechanical electron states and electron transport in tunnel-coupled semiconductor nanostructures as a first step toward these possible applications. This research program is interdisciplinary in nature and involves one or more graduate students, who receive excellent training in preparation for careers in industry, government laboratories or academia. ***
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NNCI: Center for Nanoscale Systems (CNS)
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批准号:2025158
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项目类别:Cooperative Agreement
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资助金额:$500.0万
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财政年份:2020
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负责人:Robert Westervelt
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依托单位:
NSF Nanoscale Science and Engineering (NSE) 2018 Grantees Conference, at Westin Alexandria Hotel, Alexandria, VA, on December 6-7, 2018
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批准号:1842567
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项目类别:Standard Grant
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资助金额:$10.0万
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财政年份:2018
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负责人:Robert Westervelt
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依托单位:
NNCI: The Center for Nanoscale System (CNS) at Harvard University
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批准号:1541959
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项目类别:Cooperative Agreement
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资助金额:$500.0万
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财政年份:2015
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负责人:Robert Westervelt
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依托单位:
Center for Integrated Quantum Materials
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批准号:1231319
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项目类别:Cooperative Agreement
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资助金额:$1997.2万
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财政年份:2013
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负责人:Robert Westervelt
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依托单位:
Imaging Electron States in Nanostructures
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批准号:1105341
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项目类别:Continuing Grant
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资助金额:$40.5万
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财政年份:2011
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负责人:Robert Westervelt
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依托单位:
Science of Nanoscale Systems and their Device Applications NSEC
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批准号:0646094
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项目类别:Cooperative Agreement
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资助金额:$1290.8万
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财政年份:2006
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负责人:Robert Westervelt
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依托单位:
Science of Nanoscale Systems and their Device Applications NSEC
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批准号:0117795
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项目类别:Cooperative Agreement
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资助金额:$0.0万
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财政年份:2001
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负责人:Robert Westervelt
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依托单位:
Molecular Electronics
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批准号:9871810
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项目类别:Continuing Grant
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资助金额:$45.0万
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财政年份:1998
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负责人:Robert Westervelt
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依托单位:
Materials Research Science and Engineering Center
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批准号:9809363
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项目类别:Cooperative Agreement
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资助金额:$1054.0万
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财政年份:1998
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负责人:Robert Westervelt
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依托单位:
Electron Transport in Quantum Dots
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批准号:9501438
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项目类别:Continuing Grant
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资助金额:$22.5万
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财政年份:1995
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负责人:Robert Westervelt
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依托单位:
Electronic Transport in Graded Gallium Arsenide/Aluminum Gallium Arsenide Heterostructures
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批准号:9119386
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项目类别:Continuing Grant
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资助金额:$18.0万
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财政年份:1992
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负责人:Robert Westervelt
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依托单位:
Electronic Transport in Parabolic Wells
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批准号:8817309
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项目类别:Continuing Grant
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资助金额:$14.9万
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财政年份:1989
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负责人:Robert Westervelt
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依托单位:
Nonclassical Electronic and Optical Transport Phenomena (Materials Research)
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批准号:8508733
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项目类别:Continuing Grant
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资助金额:$24.05万
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财政年份:1985
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负责人:Robert Westervelt
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依托单位:
Electronic Conduction and Localization in Ultra-Thin Free-Standing Wires (Materials Research)
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批准号:8121563
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项目类别:Continuing Grant
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资助金额:$18.93万
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财政年份:1982
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负责人:Robert Westervelt
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依托单位:
国内基金
海外基金
Toward a general theory of intermittent aeolian and fluvial nonsuspended sediment transport
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批准号:--
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项目类别:--
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资助金额:55万元
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批准年份:2022
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负责人:Thomas Pahtz
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依托单位:
Intraflagellar Transport运输纤毛蛋白的分子机理
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批准号:31371354
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项目类别:面上项目
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资助金额:90.0万元
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批准年份:2013
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负责人:黄开耀
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依托单位:
苜蓿根瘤菌(S.meliloti)四碳二羧酸转运系统 (Dicarboxylate transport system, Dct系统)跨膜信号转导机理
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批准号:30870030
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项目类别:面上项目
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资助金额:30.0万元
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批准年份:2008
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负责人:文津
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依托单位: