TY - JOUR

T1 - Orbital Contributions to the Electron g Factor in Semiconductor Nanowires

AU - Winkler, Georg W.

AU - Varjas, Daniel

AU - Skolasinski, Rafal

AU - Soluyanov, Alexey A.

AU - Troyer, Matthias

AU - Wimmer, Michael

PY - 2017/7/21

Y1 - 2017/7/21

N2 - Recent experiments on Majorana fermions in semiconductor nanowires [S. M. Albrecht, A. P. Higginbotham, M. Madsen, F. Kuemmeth, T. S. Jespersen, J. Nygard, P. Krogstrup, and C. M. Marcus, Nature (London) 531, 206 (2016)] revealed a surprisingly large electronic Lande g factor, several times larger than the bulk value-contrary to the expectation that confinement reduces the g factor. Here we assess the role of orbital contributions to the electron g factor in nanowires and quantum dots. We show that an L . S coupling in higher subbands leads to an enhancement of the g factor of an order of magnitude or more for small effective mass semiconductors. We validate our theoretical finding with simulations of InAs and InSb, showing that the effect persists even if cylindrical symmetry is broken. A huge anisotropy of the enhanced g factors under magnetic field rotation allows for a straightforward experimental test of this theory.

AB - Recent experiments on Majorana fermions in semiconductor nanowires [S. M. Albrecht, A. P. Higginbotham, M. Madsen, F. Kuemmeth, T. S. Jespersen, J. Nygard, P. Krogstrup, and C. M. Marcus, Nature (London) 531, 206 (2016)] revealed a surprisingly large electronic Lande g factor, several times larger than the bulk value-contrary to the expectation that confinement reduces the g factor. Here we assess the role of orbital contributions to the electron g factor in nanowires and quantum dots. We show that an L . S coupling in higher subbands leads to an enhancement of the g factor of an order of magnitude or more for small effective mass semiconductors. We validate our theoretical finding with simulations of InAs and InSb, showing that the effect persists even if cylindrical symmetry is broken. A huge anisotropy of the enhanced g factors under magnetic field rotation allows for a straightforward experimental test of this theory.

KW - INITIO MOLECULAR-DYNAMICS

KW - TOTAL-ENERGY CALCULATIONS

KW - AUGMENTED-WAVE METHOD

KW - DOT BAND-STRUCTURE

KW - QUANTUM-WELLS

KW - INSB NANOWIRE

KW - SUPERCONDUCTOR NANOWIRES

KW - MAJORANA FERMIONS

KW - CARBON NANOTUBES

KW - ANGULAR-MOMENTUM

U2 - 10.1103/PhysRevLett.119.037701

DO - 10.1103/PhysRevLett.119.037701

M3 - статья

VL - 119

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 3

M1 - 037701

ER -