Capacitance spectroscopy in quantum dots: Addition spectra and decrease of tunneling rates.
Capacitance spectroscopy in quantum dots: Addition spectra and decrease of tunneling rates.
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量子点中的电容光谱：加法光谱和隧道速率的降低。
DOI：
10.1103/physrevb.50.5760
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
Tejedor
中科院分区：
文献类型：
--
作者：
Palacios;Martín;Chiappe;Louis;Tejedor
对量子点单电子电容谱进行了理论研究。精确的对角化和无限制的Hartree-Fock近似已被用来阐明一些未解决的问题。得到了最多15个电子的加合谱，并与实验进行了比较。我们显示的证据来理解的行为方面的单电子隧穿率的下降！→ 0光谱权重函数。单电子电容谱（SECS）[1，2]是量子点（QD）电子结构实验知识的一个突破。Ashoori和同事[1，2]已经能够确定将电子从0到50逐个引入QD所需的能量。电子通过垂直栅极偏压隧穿到QD中，并改变器件的电容。作为一个电极中费米能量EF的函数的电容的测量示出了一组离散的几乎相等间隔的不同强度的峰。当EF = ε（N）= E0（N）− E0（N − 1）时出现峰值，其中E0（N）是QD中N个电子的基态（GS）能量。通过这种方式，
A theoretical study of single electron capacitance spectroscopy in quantum dots is presented. Exact diagonalizations and the unrestricted Hartree-Fock approximation have been used to shed light over some of the unresolved aspects. The addition spectra of up to 15 electrons is obtained and compared with the experiment. We show evidence for understanding the decrease of the single electron tunneling rates in terms of the behavior of the ! → 0 spectral weight function. Single electron capacitance spectroscopy (SECS) [1,2] has been a breakthrough in the experimental knowledge of the electronic structure of a quantum dot (QD). Ashoori and co-workers [1,2] have been able to determine the energies required to introduce electrons one by one, from 0 to 50, into a QD. The electrons tunnel into the QD by means of a vertical gate bias, and change the capacitance of the device. The measurement of that capacitance as a function of the Fermi energy EF in one electrode shows a discrete set of almost equally spaced peaks of different intensities. A peak appears whenever EF = � (N) = E0(N) − E0(N − 1), with E0(N) being the ground state (GS) energy of N electrons in the QD. In this way,