title: Heavy-Hole States in Germanium Hut Wires.
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.
authors.affiliation: Institute of Science and Technology Austria , Am Campus 1, 3400 Klosterneuburg, Austria.|Institute of Semiconductor and Solid State Physics, Johannes Kepler University , Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: Hannes
authors.initials: H
authors.lastname: Watzinger
authors.affiliation: Department of Physics, University of Basel , Klingelbergstrasse 82, 4056 Basel, Switzerland.
authors.forename: Christoph
authors.initials: C
authors.lastname: Kloeffel
authors.affiliation: Institute of Science and Technology Austria , Am Campus 1, 3400 Klosterneuburg, Austria.|Institute of Semiconductor and Solid State Physics, Johannes Kepler University , Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: Lada
authors.initials: L
authors.lastname: Vukušić
authors.affiliation: Electron Microscopy Center, Empa, Swiss Federal Laboratories for Materials Science and Technology , Überlandstrasse 129, 8600 Dübendorf, Switzerland.|IBM Research Zürich , CH-8803 Rüschlikon, Switzerland.
authors.forename: Marta D
authors.initials: MD
authors.lastname: Rossell
authors.affiliation: Chair for Nanoelectronic Materials, Technical University Dresden , 01062 Dresden, Germany.
authors.forename: Violetta
authors.initials: V
authors.lastname: Sessi
authors.affiliation: Institute of Science and Technology Austria , Am Campus 1, 3400 Klosterneuburg, Austria.|Institute of Semiconductor and Solid State Physics, Johannes Kepler University , Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: Josip
authors.initials: J
authors.lastname: Kukučka
authors.affiliation: Institute of Science and Technology Austria , Am Campus 1, 3400 Klosterneuburg, Austria.|Institute of Semiconductor and Solid State Physics, Johannes Kepler University , Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: Raimund
authors.initials: R
authors.lastname: Kirchschlager
authors.affiliation: Institute of Science and Technology Austria , Am Campus 1, 3400 Klosterneuburg, Austria.|Institute of Semiconductor and Solid State Physics, Johannes Kepler University , Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Lausecker
authors.affiliation: Institute of Science and Technology Austria , Am Campus 1, 3400 Klosterneuburg, Austria.|Institute of Semiconductor and Solid State Physics, Johannes Kepler University , Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: Alisha
authors.initials: A
authors.lastname: Truhlar
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University , Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: Martin
authors.initials: M
authors.lastname: Glaser
authors.affiliation: Institute of Semiconductor and Solid State Physics, Johannes Kepler University , Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: Armando
authors.initials: A
authors.lastname: Rastelli
authors.affiliation: IBM Research Zürich , CH-8803 Rüschlikon, Switzerland.
authors.forename: Andreas
authors.initials: A
authors.lastname: Fuhrer
authors.affiliation: Department of Physics, University of Basel , Klingelbergstrasse 82, 4056 Basel, Switzerland.
authors.forename: Daniel
authors.initials: D
authors.lastname: Loss
authors.affiliation: Institute of Science and Technology Austria , Am Campus 1, 3400 Klosterneuburg, Austria.|Institute of Semiconductor and Solid State Physics, Johannes Kepler University , Altenbergerstrasse 69, 4040 Linz, Austria.
authors.forename: Georgios
authors.initials: G
authors.lastname: Katsaros
keywords: Germanium; Luttinger−Kohn Hamiltonian; g-factor; heavy hole; quantum dot