本文選題：量子點 + 能斯特效應　； 參考：《物理學報》2017年09期

【摘要】：基于非平衡態(tài)格林函數方法,理論研究了與四個電極耦合的雙量子點系統(tǒng)中的自旋和電荷能斯特效應,考慮了不同電極的磁動量結構和量子點內以及量子點間電子的庫侖相互作用對熱電效應的影響.結果表明鐵磁端口中的磁化方向能夠有效地調節(jié)能斯特效應:當電極1和電極3中的磁化方向反平行排列時,通過施加橫向的溫度梯度,系統(tǒng)中將會出現純的自旋能斯特效應;當電極4從普通金屬端口轉變?yōu)殍F磁金屬端口時,將同時觀測到電荷和自旋能斯特效應.研究發(fā)現,能斯特效應對于鐵磁電極極化強度的依賴程度較弱,但對庫侖排斥作用十分敏感.在量子點內和點間庫侖排斥作用的影響下,自旋及電荷能斯特系數有望提高兩個數量級.
[Abstract]:Based on the Green's function method of nonequilibrium states, the spin and charge Nernst effects in a two-quantum dot system coupled with four electrodes are studied theoretically. The influence of the magnetic momentum structure of different electrodes and the Coulomb interaction of electrons in quantum dots and quantum dots on the thermoelectric effect is considered. The results show that the magnetization direction in the ferromagnetic port can effectively adjust the Nernst effect: when the magnetization direction in electrode 1 and electrode 3 is antiparallel, the pure spin Nernst effect will appear in the system by applying the transverse temperature gradient. When the electrode 4 changes from the ordinary metal port to the ferromagnetic metal port, both the charge and the spin Nernst effect will be observed at the same time. It is found that the Nernst effect is less dependent on the polarization intensity of ferromagnetic electrodes but sensitive to Coulomb repulsion. The spin and charge Nernst coefficients are expected to increase by two orders of magnitude under the influence of Coulomb repulsion in and between quantum dots.
【作者單位】： 渤海大學新能源學院;首都師范大學初等教育學院;清華大學物理系;量子物質科學協同創(chuàng)新中心;
【基金】：國家自然科學基金(批準號:11547209,11604021,11574173) 遼寧省博士科研啟動基金指導計劃(批準號:201601352) 低維量子物理國家重點實驗室開放課題(批準號:KF201613) 北京市教育委員會科技計劃一般項目(批準號:KM201410028021)資助的課題~~
【分類號】：O471.1
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本文編號：1969409