Anomalous temperature dependence of Coulomb oscillations at nearly degenerate levels

被引：18

作者：

Eto, M

机构：

[1] Department of Physics, Faculty of Science and Technology, Keio University, Yokohama 223, 3-14-1 Hiyoshi, Kohoku-ku

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1997年 / 66卷 / 08期

关键词：

quantum dot; Coulomb blockade; Coulomb oscillation; correlation effect; exact diagonalization;

D O I：

10.1143/JPSJ.66.2244

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Peak heights of the Coulomb oscillation are examined based on the exact-diagonal calculations of many-body states in a quantum dot, where the Coulomb interaction energy is comparable with the one-electron level spacings. At nearly degenerate levels, high-spin states appear: in accordance with recent experimental results [Tarucha et al.: Phys. Rev. Lett. 77 (1996) 3613], and some peaks of the conductance can increase with temperature. Two mechanisms are proposed for this anomalous temperature dependence. This phenomenon reflects a level spacing as small as one Kelvin and the total spin of the electronic states.

引用

页码：2244 / 2247

页数：4

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