Fast hole tunneling times in germanium hut wires probed by single-shot reflectometry

article Fast hole tunneling times in germanium hut wires probed by single-shot reflectometry published yes Lada Vukusic author 31E9F056-F248-11E8-B48F-1D18A9856A870000-0003-2424-8636 Josip Kukucka author 3F5D8856-F248-11E8-B48F-1D18A9856A87 Hannes Watzinger author 35DF8E50-F248-11E8-B48F-1D18A9856A87 Georgios Katsaros author 38DB5788-F248-11E8-B48F-1D18A9856A870000-0001-8342-202X GeKa department Towards Spin qubits and Majorana fermions in Germanium self assembled hut-wires project 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. https://research-explorer.ista.ac.at/download/840/4951/IST-2017-865-v1+1_acs.nanolett.7b02627.pdf application/pdfno American Chemical Society2017 eng Nano Letters 1530-6984 00041104350007810.1021/acs.nanolett.7b02627 1795706 - 5710 https://research-explorer.ista.ac.at/record/7977 https://research-explorer.ista.ac.at/record/7996 https://research-explorer.ista.ac.at/record/69 Vukušić, Lada, Josip Kukucka, Hannes Watzinger, and Georgios Katsaros. “Fast Hole Tunneling Times in Germanium Hut Wires Probed by Single-Shot Reflectometry.” Nano Letters. American Chemical Society, 2017. <a href="https://doi.org/10.1021/acs.nanolett.7b02627">https://doi.org/10.1021/acs.nanolett.7b02627</a>. Vukušić L, Kukucka J, Watzinger H, Katsaros G. Fast hole tunneling times in germanium hut wires probed by single-shot reflectometry. Nano Letters. 2017;17(9):5706-5710. doi:<a href="https://doi.org/10.1021/acs.nanolett.7b02627">10.1021/acs.nanolett.7b02627</a> L. Vukušić, J. Kukucka, H. Watzinger, G. Katsaros, Nano Letters 17 (2017) 5706–5710. Vukušić L, Kukucka J, Watzinger H, Katsaros G. 2017. Fast hole tunneling times in germanium hut wires probed by single-shot reflectometry. Nano Letters. 17(9), 5706–5710. Vukušić, Lada, et al. “Fast Hole Tunneling Times in Germanium Hut Wires Probed by Single-Shot Reflectometry.” Nano Letters, vol. 17, no. 9, American Chemical Society, 2017, pp. 5706–10, doi:<a href="https://doi.org/10.1021/acs.nanolett.7b02627">10.1021/acs.nanolett.7b02627</a>. Vukušić, L., Kukucka, J., Watzinger, H., & Katsaros, G. (2017). Fast hole tunneling times in germanium hut wires probed by single-shot reflectometry. Nano Letters. American Chemical Society. <a href="https://doi.org/10.1021/acs.nanolett.7b02627">https://doi.org/10.1021/acs.nanolett.7b02627</a> L. Vukušić, J. Kukucka, H. Watzinger, and G. Katsaros, “Fast hole tunneling times in germanium hut wires probed by single-shot reflectometry,” Nano Letters, vol. 17, no. 9. American Chemical Society, pp. 5706–5710, 2017. 8402018-12-11T11:48:47Z2025-07-10T11:57:05Z