2013 Fiscal Year Final Research Report
Studies of photon creation and fluctuation emitted from quantum Hall electron systems via on-chip terahertz detection
| Project/Area Number |
24654085
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Single-year Grants |
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| Research Field |
Condensed matter physics I
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| Research Institution | Tokyo University of Agriculture and Technology |
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Principal Investigator |
IKUSHIMA Kenji 東京農工大学, 工学(系)研究科(研究院), 准教授 (20334302)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Keywords | 量子ホール効果 / 量子ドット / テラヘルツ |
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| Research Abstract |
The purpose of this work is to investigate mechanism of cyclotron emission due to electrons injected by quantum Hall edge states through integrated terahertz photon circuits in which quantum-dot single terahertz photon detectors are embedded. In this work, we found (1) THz photons are emitted from edge states with a clear onset voltage, where the electrochemical potential of the outer v=2 edge states is lower than that of the inner v=3 edge states (where v is Laudau level filling factor) and (2) the spin splitting is enhanced by a factor of about 20, comparing with that in bulk GaAs, because of the exchange interaction in the spin polarized edge states. These results strongly suggest the presence of spin-flip cyclotron emission requiring spin-orbit interaction. This indicates the possibility of transfer from spin states to photon states through coherent spin-polarized edge states, providing a new approach to quantum information devices.
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