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

Henrik A Nilsson, Philippe Caroff, Claes Thelander, Marcus Larsson, Jakob Birkedal Wagner, Lars-Erik Wernersson, Lars Samuelson, H. Q Xu

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

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.
Original languageEnglish
JournalNano Letters
Volume9
Issue number9
Pages (from-to)3151-3156
ISSN1530-6984
DOIs
Publication statusPublished - 2009
Externally publishedYes

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