2012 Fiscal Year Final Research Report
Opical manipulation excitonic matter phase
| Project Area | Optical science of dynamically correlated electrons in semiconductors |
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| Project/Area Number |
20104002
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
GONOKAMI Makoto 東京大学, 大学院・理学系研究科, 教授 (70161809)
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| Co-Investigator(Kenkyū-buntansha) |
NAKA Nobuko 京都大学, 理学研究科, 准教授 (10292830)
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| Project Period (FY) |
2008 – 2012
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| Keywords | 光物性 / 半導体物性 / 物性理論 / 材料化学 / 量子エレクトロニクス |
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| Research Abstract |
We investigated quantum degenerate matter phases of photo-generated electrons and holes in semiconductor materials and explored and developed techniques to control and manipulate such systems. Major achievements include the successful observation of the Bose-Einstein phase transition of excitons created and confined in a three-dimensional trap in a bulk direct-gap semiconductor. In an attempt to further stabilize the condensate phase, an ultracold quantum degenerate gas of excitons was then created by cooling it down with a dilution refrigerator. Also, we developed an excitation scheme for the cold electron-hole system in diamond, a wide-gap indirect semiconductor. It led to the discovery of the polyexciton bound state in the low temperature regime, formed as a result of the suppression of electron-hole droplet formation. Furthermore, a high-order photon correlation acquisition system using a streak camera was developed as a method to measure the photon statistics in an ultrafast timescale. Using this, we detected an oscillation, induced by the relaxation oscillation phenomena, of the second-order correlation function for a vertical cavity surface emitting laser in the vicinity of the laser threshold. Moreover, we explored a new method to control material excitations using waveform-shaped pulses. We focused particularly on the conservation of quasi-angular momentum in Raman-type processes in crystals possessing three-fold rotational symmetries. As a result, an unrestrained control of magnon spin states and THz polarizations was demonstrated by shaping optical pulses as vector waves and thus regulating temporal characteristics of their polarization states.
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Research Products
(36 results)
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[Remarks] 1. M. Kuwata-Gonokami: 2013 Fellow of Optical Society of America, Citation: For contributions to laser spectroscopy and photon science including nonlinear spectroscopy of semiconductors, high density phenomena, cold atoms and micro cavity structures., OSA
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[Remarks] 2. M. Kuwata-Gonokami: 2012 Fellow of American Physical Society, Division of Laser Science, Citation: For contributions to laser spectroscopy and photon science including nonlinear spectroscopy of semiconductors, high density phenomena, cold atoms and micro cavity structures., APS
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[Remarks] 3. 今井亮, 神田夏輝,鄭渚,小西邦昭,五神 真:第32回(2012年春季)応用物理学会講演奨励賞「非線形光学結晶を用いたテラヘルツベクトルビームの発生」
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[Remarks] 4. T. Higuchi received Young Investigator Award in Gordon Research Conference (Ultrafast Phenomena in Cooperative Systems 2012)
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[Remarks] 5. 吉岡孝高:平成23年度日本物理学会若手奨励賞受賞(領域5)(2011年11月)
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[Remarks] 6. 五神真:第14回 松尾学術賞「レーザー分光法による固体における光量子物理学の研究」2010年10月28日
