Related papers: Identification of soft modes in amorphous Al$_{2}$O$

Identification of soft modes in amorphous Al$_{2}$O$_{3}$ via first-principles

URL: http://arxiv.org/abs/2502.14823v1
Date: Thu, 20 Feb 2025 18:43:24 GMT
Title: Identification of soft modes in amorphous Al$_{2}$O$_{3}$ via first-principles
Authors: Alexander C. Tyner, Joshuah T. Heath, Thue Christian Thann, Vincent P. Michal, Peter Krogstrup, Mark Kamper Svendsen, Alexander V. Balatsky,
Abstract summary: Amorphous Al$_2$O$_3$ is a fundamental component of modern superconducting qubits. We perform a first-principles study of amorphous Al$_2$O$_3$ and identify low-energy modes in the electronic and phonon spectra as a possible origin for TLSs.
Score: 69.65384453064829
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Abstract: Amorphous Al$_{2}$O$_{3}$ is a fundamental component of modern superconducting qubits. While amphorphous oxides offer distinct advantages, such as directional isotropy and a consistent bulk electronic gap, in realistic systems these compounds support two-level systems (TLSs) which couple to the qubit, expediting decoherence. In this work, we perform a first-principles study of amorphous Al$_{2}$O$_{3}$ and identify low-energy modes in the electronic and phonon spectra as a possible origin for TLSs.

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