Magnetic stability of oxygen defects on the SiO2 surface

Journal Article · Tue Feb 21 00:00:00 EST 2017 · AIP Advances

DOI:https://doi.org/10.1063/1.4977194· OSTI ID:1349365

Adelstein, Nicole ^[1]; Lee, Donghwa  ^[1]; DuBois, Jonathan L. ^[1]; Ray, Keith G. ^[1]; Varley, Joel B. ^[1]; Lordi, Vincenzo ^[1]

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1. Lawrence Livermore National Laboratory, Livermore, California 94550, USA and San Francisco State University, San Francisco, California 94132, USA

The magnetic stability of E' centers and the peroxy radical on the surface of α-quartz is investigated with first-principles calculations to understand their role in magnetic flux noise in superconducting qubits (SQs) and superconducting quantum interference devices (SQUIDs) fabricated on amorphous silica substrates. Paramagnetic E' centers are common in both stoichiometric and oxygen deficient silica and quartz, and we calculate that they are more common on the surface than the bulk. However, we find the surface defects are magnetically stable in their paramagnetic ground state and thus will not contribute to 1/f noise through fluctuation at millikelvin temperatures.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC52-07NA28344; 12-ERD-020; 15-ERD-051; AC52-07NA27344
• OSTI ID: 1349365
• Alternate ID(s): OSTI ID: 1395303; OSTI ID: 1420520; OSTI ID: 1810678
• Report Number(s): LLNL-JRNL-645056; AAIDBI; 10.1063/1.4977194
• Journal Information: AIP Advances, Journal Name: AIP Advances Vol. 7 Journal Issue: 2; ISSN 2158-3226
• Publisher: American Institute of Physics
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Silica
Crystal defects
Excited states
Valence bands
Dangling bonds