Giant, Level-Dependent g Factors in InSb Nanowire Quantum Dots

被引：230

作者：

Nilsson, Henrik A. ^{[1
]}

Caroff, Philippe ^{[1
]}

Thelander, Claes ^{[1
]}

Larsson, Marcus ^{[1
]}

Wagner, Jakob B. ^{[2
]}

Wernersson, Lars-Erik ^{[1
]}

Samuelson, Lars ^{[1
]}

Xu, H. Q. ^{[1
]}

机构：

[1] Lund Univ, Div Solid State Phys, S-22100 Lund, Sweden

[2] Lund Univ, Div Polymer & Mat Chem nCHREM, S-22100 Lund, Sweden

来源：

NANO LETTERS | 2009年 / 9卷 / 09期

基金：

瑞典研究理事会;

关键词：

SPECTROSCOPY; SPINTRONICS; SPINS;

D O I：

10.1021/nl901333a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report on magnetotransport measurements on InSb nanowire quantum dots. The measurements show that the quantum levels of the InSb quantum dots have giant g factors, with absolute values up to similar to 70, the largest value ever reported for semiconductor quantum dots. We also observe that the values of these g factors are quantum level dependent and can differ strongly between different quantum levels. The presence of giant g factors indicates that considerable contributions from the orbital motion of electrons are preserved in the measured InSb nanowire quantum dots, while the level-to-level fluctuations arise from spin-orbit interaction. We have deduced a value of Delta(so) = 280 mu eV for the strength of spin-orbit interaction from an avoided level crossing between the ground state and first excited state of an InSb nanowire quantum dot with a fixed number of electrons.

引用

页码：3151 / 3156

页数：6

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