title: Giant, level-dependent g factors in InSb nanowire quantum dots.
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 approximately 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 mueV 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.
authors.affiliation: Division of Solid State Physics, Lund University, S-22100 Lund, Sweden.
authors.forename: Henrik A
authors.initials: HA
authors.lastname: Nilsson
authors.forename: Philippe
authors.initials: P
authors.lastname: Caroff
authors.forename: Claes
authors.initials: C
authors.lastname: Thelander
authors.forename: Marcus
authors.initials: M
authors.lastname: Larsson
authors.forename: Jakob B
authors.initials: JB
authors.lastname: Wagner
authors.forename: Lars-Erik
authors.initials: LE
authors.lastname: Wernersson
authors.forename: Lars
authors.initials: L
authors.lastname: Samuelson
authors.forename: H Q
authors.initials: HQ
authors.lastname: Xu
mesh_terms: D000965:Antimony / Q000737:chemistry*; D004583:Electrons; D007204:Indium / Q000737:chemistry*; D008422:Materials Testing; D036103:Nanotechnology; D053770:Nanowires / Q000737:chemistry*; D010316:Particle Size; D045663:Quantum Dots; D011789:Quantum Theory; D012666:Semiconductors; D012825:Silicon / Q000737:chemistry; D013499:Surface Properties
chemical_list: D007204:Indium; D000965:Antimony; D012825:Silicon