This Letter was published online on 27 July 2016 with an omission in the Acknowledgment section. The first sentence of the Acknowledgment section should read “The first-principles calculations performed for this Letter were supported by the Department of Energy Grant No. DE-SC0016239.” The Acknowledgment section has been corrected as of 29 May 2020. The Acknowledgments are incomplete in the printed version of the journal.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)