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Document Type

Commentary

Publication Date

1-5-2016

Notes/Citation Information

Published in Physical Review Letters, v. 116, issue 1, 019101, p. 1-2.

© 2016 American Physical Society

The copyright holder has granted permission for posting the article here.

Digital Object Identifier (DOI)

https://doi.org/10.1103/PhysRevLett.116.019101

Funding Information

We acknowledge support from the U.S. Department of Energy under Contracts No. DE-AC02-76SF00515 and No. DE-FG02-96ER40989.

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Physics Commons

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