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Interaction effect on adiabatic pump of charge and spin in quantum dot
http://hdl.handle.net/2241/00133019
15e07537-f9d5-4cda-954b-07d7e73b88b8
名前 / ファイル | ライセンス | Actions | |
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item type | Journal Article(1) | |||||
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公開日 | 2016-01-12 | |||||
タイトル | ||||||
タイトル | Interaction effect on adiabatic pump of charge and spin in quantum dot | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
タイプ | journal article | |||||
著者 |
Nakajima, Satoshi
× Nakajima, Satoshi× Taguchi, Masahiko× Kubo, Toshihiro× Tokura, Yasuhiro |
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著者別名 |
都倉, 康弘
× 都倉, 康弘 |
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抄録 | ||||||
内容記述 | We investigate the pumped charge and spin at zero bias by a modulation of two control parameters using the full counting statistics with quantum master equation approach. First we study higher order effects of the pumping frequency in general Markov systems and show in this limit the equivalence between our approach and the real-time diagrammatic approach. An adiabatic modulation of the control parameters induces the Berry-Sinitsyn-Nemenman (BSN) phase. We show that the origin of the BSN phase is a nonadiabatic effect. The pumped charge (spin) is given by a summation of (i) a time integral of the instantaneous steady charge (spin) current and (ii) a geometric surface integral of the BSN curvature, which results from the BSN phase. In quantum dots (QDs) weakly coupled to two leads, we show that (i) is usually dominant if the thermodynamic parameters are modulated, although it is zero if the thermodynamic parameters are fixed to zero bias. To observe the spin effects, we consider collinear magnetic fields, which relate to spins through the Zeeman effect, with different amplitudes applying to the QDs and the leads. For interacting one level QD, we calculate analytically the pumped charge and spin by modulating the magnetic fields and the coupling strengths to the leads in the noninteracting and strong interacting limits. We show that the difference between these two limits appears through the instantaneous averages of the numbers of the electron with up and down spin in the QD. For the quantum pump by the modulation of the magnetic fields of the QD and one lead, the energy dependences of linewidth functions, which are usually neglected, are essential. | |||||
書誌情報 |
Physical review B 巻 92, 号 19, p. 195420, 発行日 2015-11 |
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ISSN | ||||||
収録物識別子 | 1098-0121 | |||||
書誌レコードID | ||||||
収録物識別子 | AA11187113 | |||||
DOI | ||||||
関連識別子 | ||||||
関連識別子 | 10.1103/PhysRevB.92.195420 | |||||
権利 | ||||||
権利情報 | ©2015 American Physical Society | |||||
著者版フラグ | ||||||
値 | publisher | |||||
出版者 | ||||||
出版者 | American Physical Society |