Tom'as A. Arias

collaborators

3 papers

cond-mat.supr-con2026

$Ab initio$ Identification of Hydrogen Tunneling as Two-Level Systems in Nb $_{2}$ O $_{5}$ and Ta $_{2}$ O $_{5}$

CristÃ³bal MÃ©ndez, TomÃ¡s A. Arias

Two-level systems (TLS) in native Nb and Ta oxides limit superconducting-qubit coherence and SRF-cavity quality factors in the microwave frequency range, yet their microscopic orig…

cond-mat.supr-con2026

$Ab initio$ Theory of Eliminating Surface Oxides of Superconductors with Noble-Metal Encapsulation

CristÃ³bal MÃ©ndez, Nathan Sitaraman, Matthias Liepe +1

Nanometer-scale surface chemistry limits the performance of SRF cavities and quantum circuits. We present an ab initio framework connecting DFT interfacial energetics with strong-c…

cond-mat.supr-con2025

A Computational Picture of Hydride Formation and Dissipation In Nb SRF Cavities

Aiden Harbick, Mark Transtrum, Nathan Sitaraman +2

Research linking surface hydrides to Q-disease, and the subsequent development of methods to eliminate surface hydrides, is one of the great successes of SRF cavity R&D. We use tim…

Ab initio Identification of Hydrogen Tunneling as Two-Level Systems in Nb2​O5​ and Ta2​O5​

Ab initio Theory of Eliminating Surface Oxides of Superconductors with Noble-Metal Encapsulation

A Computational Picture of Hydride Formation and Dissipation In Nb SRF Cavities

$Ab initio$ Identification of Hydrogen Tunneling as Two-Level Systems in Nb $_{2}$ O $_{5}$ and Ta $_{2}$ O $_{5}$

$Ab initio$ Theory of Eliminating Surface Oxides of Superconductors with Noble-Metal Encapsulation