McArdle G, Davies R, Lerner I V, Yurkevich I V
School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, United Kingdom.
School of Informatics and Digital Engineering, Aston University, Birmingham B4 7ET, United Kingdom.
J Phys Condens Matter. 2023 Aug 29;35(47). doi: 10.1088/1361-648X/acede0.
We investigate the Coulomb blockade in quantum dots asymmetrically coupled to the leads for an arbitrary voltage bias focusing on the regime where electrons do not thermalise during their dwell time in the dot. By solving the quantum kinetic equation, we show that the current-voltage characteristics are crucially dependent on the ratio of the Fermi energy to charging energy on the dot. In the standard regime when the Fermi energy is large, there is a Coulomb staircase which is practically the same as in the thermalised regime. In the opposite case of the large charging energy, we identify a new regime in which only one step is left in the staircase, and we anticipate experimental confirmation of this finding.
我们研究了在任意电压偏置下，量子点与引线不对称耦合时的库仑阻塞现象，重点关注电子在量子点停留期间不发生热化的情况。通过求解量子动力学方程，我们表明电流 - 电压特性关键取决于量子点上费米能量与充电能量的比值。在费米能量较大的标准情况下，存在一个库仑阶梯，实际上与热化情况下的库仑阶梯相同。在充电能量较大的相反情况下，我们确定了一个新的区域，其中库仑阶梯中只剩下一级，我们期待这一发现能得到实验证实。
