Ground-state energy and spin in disordered quantum dots

被引：27

作者：

Hirose, K

Wingreen, NS

机构：

[1] NEC Corp Ltd, Fundamental Res Labs, Tsukuba, Ibaraki 3058501, Japan

[2] NEC Res Inst, Princeton, NJ 08540 USA

来源：

PHYSICAL REVIEW B | 2002年 / 65卷 / 19期

关键词：

D O I：

10.1103/PhysRevB.65.193305

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the ground-state energy and spin of disordered quantum dots using spin-density-functional theory. Fluctuations of addition energies (Coulomb-blockade peak spacings) do not scale with average addition energy but remain proportional to level spacing. With increasing interaction strength, the even-odd alternation of addition energies disappears, and the probability of nonminimal spin increases, but never exceeds 50%. Within a two-orbital model, we show that the off-diagonal Coulomb matrix elements help stabilize a ground state of minimal spin.

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收藏

页码：1933051 / 1933054

页数：4

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