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  • Title: Fast Hole Tunneling Times in Germanium Hut Wires Probed by Single-Shot Reflectometry.
    Author: Vukušić L, Kukučka J, Watzinger H, Katsaros G.
    Journal: Nano Lett; 2017 Sep 13; 17(9):5706-5710. PubMed ID: 28795821.
    Abstract:
    Heavy holes confined in quantum dots are predicted to be promising candidates for the realization of spin qubits with long coherence times. Here we focus on such heavy-hole states confined in germanium hut wires. By tuning the growth density of the latter we can realize a T-like structure between two neighboring wires. Such a structure allows the realization of a charge sensor, which is electrostatically and tunnel coupled to a quantum dot, with charge-transfer signals as high as 0.3 e. By integrating the T-like structure into a radiofrequency reflectometry setup, single-shot measurements allowing the extraction of hole tunneling times are performed. The extracted tunneling times of less than 10 μs are attributed to the small effective mass of Ge heavy-hole states and pave the way toward projective spin readout measurements.
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