2012 Fiscal Year Final Research Report
Theory on band-gap control and correlation effects in semiconductors
Project/Area Number |
21740231
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Single-year Grants |
Research Field |
Condensed matter physics I
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Research Institution | Osaka University |
Principal Investigator |
ASANO Kenichi 大阪大学, 大学院・理学研究科, 准教授 (10379274)
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Project Period (FY) |
2009 – 2012
|
Keywords | 半導体 / 電子正孔系 / Dirac 電子系 |
Research Abstract |
In decreasing the bandgap of the direct semiconductor, the nonparabolicity of the energy band is enhanced, and the Dirac electron system with linear dispersion is realized at zero band gap. Further making the bandgap negative, one could obtain the semimetallc electron-hole systems. We study the effect of correlation in these Dirac and semimetallic electron-hole systems. We particularly clarified the following five issues; (1) cyclotron resonance on grapheme under strong magnetic field (2) novel pair condensations in electron-hole bilayers with density unbalance (3) biexcitons and trions in semiconducting carbon nanotubes (4) global phase diagrams of low-dimensional electron-hole systems (5) Designing of Dirac points in energy band.
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