本文選題：量子點(diǎn) + 能斯特效應(yīng)��； 參考：《物理學(xué)報(bào)》2017年09期

【摘要】：基于非平衡態(tài)格林函數(shù)方法,理論研究了與四個(gè)電極耦合的雙量子點(diǎn)系統(tǒng)中的自旋和電荷能斯特效應(yīng),考慮了不同電極的磁動(dòng)量結(jié)構(gòu)和量子點(diǎn)內(nèi)以及量子點(diǎn)間電子的庫(kù)侖相互作用對(duì)熱電效應(yīng)的影響.結(jié)果表明鐵磁端口中的磁化方向能夠有效地調(diào)節(jié)能斯特效應(yīng):當(dāng)電極1和電極3中的磁化方向反平行排列時(shí),通過施加橫向的溫度梯度,系統(tǒng)中將會(huì)出現(xiàn)純的自旋能斯特效應(yīng);當(dāng)電極4從普通金屬端口轉(zhuǎn)變?yōu)殍F磁金屬端口時(shí),將同時(shí)觀測(cè)到電荷和自旋能斯特效應(yīng).研究發(fā)現(xiàn),能斯特效應(yīng)對(duì)于鐵磁電極極化強(qiáng)度的依賴程度較弱,但對(duì)庫(kù)侖排斥作用十分敏感.在量子點(diǎn)內(nèi)和點(diǎn)間庫(kù)侖排斥作用的影響下,自旋及電荷能斯特系數(shù)有望提高兩個(gè)數(shù)量級(jí).
[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(xué)新能源學(xué)院;首都師范大學(xué)初等教育學(xué)院;清華大學(xué)物理系;量子物質(zhì)科學(xué)協(xié)同創(chuàng)新中心;
【基金】：國(guó)家自然科學(xué)基金(批準(zhǔn)號(hào):11547209,11604021,11574173) 遼寧省博士科研啟動(dòng)基金指導(dǎo)計(jì)劃(批準(zhǔn)號(hào):201601352) 低維量子物理國(guó)家重點(diǎn)實(shí)驗(yàn)室開放課題(批準(zhǔn)號(hào):KF201613) 北京市教育委員會(huì)科技計(jì)劃一般項(xiàng)目(批準(zhǔn)號(hào):KM201410028021)資助的課題~~
【分類號(hào)】：O471.1
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本文編號(hào)：1969409