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Carrier wave-packet transport under the influence of charged quantum dot in small-area resonant tunneling diodes
KTH, School of Biotechnology (BIO), Theoretical Chemistry.
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2008 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 93, no 13, p. 132108-Article in journal (Refereed) Published
Abstract [en]

 It was shown experimentally that charging InAs quantum dots (QDs) embedded in a small-area GaAs/AlAs double-barrier resonant tunneling diode (RTD) effectively modified the carrier transport properties of the RTD. By adopting and comparing the one-dimensional plane-wave and three-dimensional (3D) wave-packet transport theories we show that the electron transports in the QDRTD device are in the form of 3D wave packets, which are strongly affected by the 3D long-range Coulomb potential induced by charged InAs QDs. This explains well experimental data and indicates that the 3D wave-packet transport model is more appropriate for the QDRTD device.

Place, publisher, year, edition, pages
2008. Vol. 93, no 13, p. 132108-
Keywords [en]
Civil aviation, Electric fields, Electron tube diodes, Frequency dividing circuits, Indium arsenide, Optical waveguides, Quantum chemistry, Quantum electronics, Resonant tunneling, Semiconducting indium, Semiconductor diodes, Statistical mechanics, Temperature measuring instruments, Three dimensional, Transport properties, Tunnel diodes, Tunneling (excavation)
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-9340DOI: 10.1063/1.2993339ISI: 000259794100050Scopus ID: 2-s2.0-53349095305OAI: oai:DiVA.org:kth-9340DiVA, id: diva2:113533
Note

QC 20100902. Uppdaterad från In press till Published (20100902)

Available from: 2008-10-21 Created: 2008-10-21 Last updated: 2022-06-27Bibliographically approved
In thesis
1. Experimental and theoretical study of quantum dot resonant tunneling diodes for single photon detection
Open this publication in new window or tab >>Experimental and theoretical study of quantum dot resonant tunneling diodes for single photon detection
2008 (English)Licentiate thesis, comprehensive summary (Other scientific)
Abstract [en]

Single photon detection has a broad application in the medical, telecommunication, as well as in infrared imaging fields. In this thesis I present my work in studying quantum dot (QD) resonant tunneling diodes (RTD) for single photon detection. The device was processed in the form of a free-standing small-area air bridge. A detailed series of experimental and theoretical characterizations have been performed to understand the electrical properties of the RTDs (without embedding any QDs) and QD-embedded RTDs (QDRTDs). It has been shown that external series and parallel resistances shift the resonant current peak to higher voltage, create the bistability effect observed in I-V characteristics, and reduce the peak-to-valley ratio. For the QDRTD device, three-dimensional wave packet carrier transport simulations show strong influence of the long-range Coulomb potential induced by the hole captured by the embedded InAs QDs, thus demonstrating the fundamental principle of single photon detection.

 

Two works are planned for the continuation of the graduate study after Lic examination. The optical response of the QDRTD will be experimentally and theoretically characterized in order to optimize the quantum efficiency for single photon detection. I will then concentrate on processing a one-dimensional photodetector array aiming at practical biotechnology applications.

Place, publisher, year, edition, pages
Stockholm: KTH, 2008. p. 36
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-9342 (URN)978-91-7415-117-6 (ISBN)
Presentation
2008-10-15, FA31, AlabaNova, Roslagsbacken 21, Stockholm, 13:00 (English)
Supervisors
Note
QC 20101111Available from: 2008-10-21 Created: 2008-10-21 Last updated: 2022-06-27Bibliographically approved

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Fu, Ying

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