An analysis of the spin-dependent electron transport in open quantum systems by using many-electron scattering eigenstates
| Project/Area Number |
23740301
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Mathematical physics/Fundamental condensed matter physics
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| Research Institution | Kanagawa University (2012-2013)
Kanagawa Institute of Technology (2011) |
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Principal Investigator |
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| Project Period (FY) |
2011 – 2013
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2013: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2012: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2011: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | 量子ドット / 量子輸送 / 開放量子系 / 散乱状態 / 厳密解 / 共鳴状態 / 電流電圧特性 / 負性微分伝導度 / 多体束縛状態 / 量子干渉 / 非平衡定常状態 |
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| Research Abstract |
We investigate the transport properties and the resonant phenomena in open quantum-dot systems by constructing exact many-electron scattering eigenstates. First, we study a parallel-coupled double quantum-dot system and obtain the exact two-electron scattering eigenstates. We find that, as a result of the Coulomb interactions, two-body bound states appear in the scattering states. We also find that the two-body bound states are interpreted as pairs of the resonant states and the anti-resonant states. Next, we study the electron transport in the systems described by the interacting resonant-level models. By using an extension of the Landauer formula, we calculate the average electric current for the system under bias voltages in the first order of the interaction parameters. We observe the suppression of the electric current for large bias voltages, i.e., negative differential conductance, and the restoration of the suppressed electric current due to the asymmetry of the systems.
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Report
(4 results)
Research Products
(25 results)
