Zobrazeno 1 - 10
of 62
pro vyhledávání: '"J. Urayama"'
Autor:
Jasprit Singh, Kyoungsik Kim, Zong-Kwei Wu, Theodore B. Norris, Pallab Bhattacharya, J. Urayama
Publikováno v:
Journal of Physics D: Applied Physics. 38:2077-2087
We have used two- and three-pulse femtosecond differential transmission spectroscopy to study the dependence of quantum dot carrier dynamics on temperature. At low temperatures and densities, the rates for relaxation between the quantum dot confined
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::942cd71a2514e767d9b362ae06377cdb
https://doi.org/10.1088/0022-3727/38/13/003
https://doi.org/10.1088/0022-3727/38/13/003
Autor:
P. K. Bhattacharya, Theodore B. Norris, S. Pradhan, Zong-Kwei Wu, J. Urayama, Kyoungsik Kim, S. Ghosh, Jasprit Singh
Publikováno v:
IEEE Journal of Quantum Electronics. 39:952-962
We have performed pump-probe differential transmission spectroscopy (DTS) measurements on In/sub 0.4/Ga/sub 0.6/As-GaAs-AlGaAs heterostructures, which show that at room temperature, injected electrons preferentially occupy the excited states in the d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b8db7e009396f7ff91392084ded1559
https://doi.org/10.1109/jqe.2003.814374
https://doi.org/10.1109/jqe.2003.814374
Publikováno v:
Physica B: Condensed Matter. :74-80
Time-resolved measurements of self-assembled In 0.4 Ga 0.6 As quantum dots indicate a phonon bottleneck between the electronic levels. The bottleneck becomes observable in a capture experiment, where fast relaxation processes are removed at low carri
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f2ceabf4ec25c70097556581f31b91eb
https://doi.org/10.1016/s0921-4526(02)00428-3
https://doi.org/10.1016/s0921-4526(02)00428-3
Publikováno v:
Physical Review Letters. 86:4930-4933
Time-resolved differential transmission measurements of self-assembled ${\mathrm{In}}_{0.4}{\mathrm{Ga}}_{0.6}\mathrm{As}$ quantum dots clearly indicate a phonon bottleneck between the $n\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}2$ and $n\ph
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d8e9c51f523ed75a072b70f4230dcea4
https://doi.org/10.1103/physrevlett.86.4930
https://doi.org/10.1103/physrevlett.86.4930
Autor:
Kori J. Urayama
Publikováno v:
Asian Survey. 40:599-621
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eb448e4c85179f9342a31afaf755a95d
https://doi.org/10.1525/as.2000.40.4.01p0089h
https://doi.org/10.1525/as.2000.40.4.01p0089h
Autor:
J. Urayama, A. Ghosh, S.B. Dutta, C. H. Holbrow, J.A. Behr, Gerald Gwinner, G.D. Sprouse, Luis A. Orozco, F. Xu, S.B. Cahn
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 351:256-260
We have tested and developed an ion beam apparatus for transporting alkali atoms made in heavy-ion reactions. Stopped recoils diffuse out of a hot thick target, are surface ionized, and extracted into a low-energy ion beam with efficiencies of approx
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::15e1442a098c572fefa7f96c36d4ad2c
https://doi.org/10.1016/0168-9002(94)91351-x
https://doi.org/10.1016/0168-9002(94)91351-x
Autor:
Theodore B. Norris, Kyoungsik Kim, J. Urayama, Jamie Phillips, Jasprit Singh, P. Bhattacharya
Publikováno v:
Applied Physics Letters. 81:670-672
Using a femtosecond three-pulse pump-probe technique, we investigated spectral hole-burning and gain recovery dynamics in self-organized In(Ga)As quantum dots. The spectral hole dynamics are qualitatively different from those observed in quantum well
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f0836bd8aaae2d657f4e832c6e68aa6
https://doi.org/10.1063/1.1493665
https://doi.org/10.1063/1.1493665
Publikováno v:
Applied Physics Letters. 80:2162-2164
We measured the transient temperature-dependent carrier population in the confined states of self-assembled In0.4Ga0.6As quantum dots as well as those of the surrounding wetting layer and barrier region using differential transmission spectroscopy. R
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::80f52e5fb44564715e57c44072fe2325
https://doi.org/10.1063/1.1462860
https://doi.org/10.1063/1.1462860
Publikováno v:
Applied Physics Letters. 76:2394-2396
Ultrafast differential transmission spectroscopy with a resonant pump reveals evidence of electronic tunneling among the excited levels of vertically aligned In0.4Ga0.6As self-organized quantum dots. This evidence of tunneling is observed as a rapid
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9aa6396a66b7bf06303683539f0d8139
https://doi.org/10.1063/1.126356
https://doi.org/10.1063/1.126356
Publikováno v:
Summaries of Papers Presented at the Lasers and Electro-Optics. CLEO '02. Technical Diges.
Summary form only given. In this paper we report the small-signal modulation characteristics of quantum dot lasers wherein electrons are injected into the quantum dots by phonon assisted tunneling. The quantum dot laser heterostructure is grown by mo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::351b8f50fc50a7d01b944bb62a98a53e
https://doi.org/10.1109/cleo.2002.1034301
https://doi.org/10.1109/cleo.2002.1034301