Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session M47: Superconducting Qubits: Metal Films I
8:00 AM–11:00 AM,
Wednesday, March 6, 2024
Room: 200CD
Sponsoring
Units:
DQI DCMP DMP
Chair: Anthony McFadden, University of California, Santa Barbara
Abstract: M47.00002 : Single-crystal aluminum superconducting ultra-thin films grown on GaAs(111)A with low twin ratios and the impact on microwave properties
8:12 AM–8:24 AM
Presenter:
Hsien-Wen Wan
(Graduate Institute of Applied Physics and Department of Physics, National Taiwan University)
Authors:
Hsien-Wen Wan
(Graduate Institute of Applied Physics and Department of Physics, National Taiwan University)
Yi-Ting Cheng
(Department of Physics, National Tsing Hua University)
Chao-Kai Cheng
(Graduate Institute of Applied Physics and Department of Physics, National Taiwan University)
Jui-Min Chia
(Department of Physics, National Tsing Hua University)
Chien-Ting Wu
(Taiwan Semiconductor Research Institute)
Chia-Hung Hsu
(National Synchrotron Radiation Research Center)
Sheng-Shiuan Yeh
(International College of Semiconductor Technology, National Yang Ming Chiao Tung University)
Yen-Hsiang Lin
(Department of Physics, National Tsing Hua University)
Jueinai Kwo
(Department of Physics, National Tsing Hua University)
Minghwei Hong
(Graduate Institute of Applied Physics and Department of Physics, National Taiwan University)
Synchrotron radiation X-ray diffraction scans on the Al films with thickness from 1.5 to 20 nm exhibited clear Pendellösung fringes. The full width at half maximum (FWHM) of θ-rocking curves of the Al films is 0.018°-0.027°. The in-plane scans revealed that the Al(111) films have low twin ratios, and the FWHM of in-plane Al(111̅) peaks is very low of 0.76°-1.88°. The surface morphology characterized by atomic force microscopy is smooth and exhibits terrace steps. The scanning transmission electron microscopy images have revealed the atomically sharp Al/GaAs interface. These nm-thick Al films exhibited high residual resistance ratios from 1.11 to 4.46, indicating the high quality of Al films with low twin ratios. Microstrip resonators were fabricated using these ultra-thin Al films to measure the internal quality factors. Such single-crystal Al is a potential candidate for building high-coherence superconducting quantum circuits.
The support from the Natl. Sci. Technol. Council in Taiwan through NSTC 112-2119-M-007-009 is acknowledged.
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