Heavy-hole states in germanium hut wires

Watzinger, Hannes and Kloeffel, Christoph and Vukušić, Lada and Rossell, Marta D and Sessi, Violetta and Kukučka, Josip and Kirchschlager, Raimund and Lausecker, Elisabeth and Truhlar, Alisha and Glaser, Martin and Rastelli, Armando and Fuhrer, Andreas and Loss, Daniel and Katsaros, Georgios (2016) Heavy-hole states in germanium hut wires. Nano Letters, 16 (11). 6879 -68785. ISSN 15306992

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Official URL: http://dx.doi.org/10.1021/acs.nanolett.6b02715

Abstract

Hole spins have gained considerable interest in the past few years due to their potential for fast electrically controlled qubits. Here, we study holes confined in Ge hut wires, a so-far unexplored type of nanostructure. Low-temperature magnetotransport measurements reveal a large anisotropy between the in-plane and out-of-plane g-factors of up to 18. Numerical simulations verify that this large anisotropy originates from a confined wave function of heavy-hole character. A light-hole admixture of less than 1% is estimated for the states of lowest energy, leading to a surprisingly large reduction of the out-of-plane g-factors compared with those for pure heavy holes. Given this tiny light-hole contribution, the spin lifetimes are expected to be very long, even in isotopically nonpurified samples.

Item Type: Article
DOI: 10.1021/acs.nanolett.6b02715
Uncontrolled Keywords: quantum dot, Germanium, g-factor, heavy hole, Luttinger−Kohn Hamiltonian
Subjects: 500 Science > 530 Physics > 539 Modern physics
Research Group: Katsaros Group
SWORD Depositor: Sword Import User
Depositing User: Sword Import User
Date Deposited: 10 Nov 2016 08:17
Last Modified: 27 Sep 2018 15:04
URI: https://repository.ist.ac.at/id/eprint/664

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