TY - JOUR AB - 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. AU - Watzinger, Hannes AU - Kloeffel, Christoph AU - Vukusic, Lada AU - Rossell, Marta AU - Sessi, Violetta AU - Kukucka, Josip AU - Kirchschlager, Raimund AU - Lausecker, Elisabeth AU - Truhlar, Alisha AU - Glaser, Martin AU - Rastelli, Armando AU - Fuhrer, Andreas AU - Loss, Daniel AU - Katsaros, Georgios ID - 1328 IS - 11 JF - Nano Letters TI - Heavy-hole states in germanium hut wires VL - 16 ER -