[2] This work was supported by the STC Center for Integrated Quantum Materials, NSF Grant No. DMR-1231319. This work was performed in part at the Center for Nanoscale Systems (CNS), a member of the National Nanotechnology Infrastructure Network (NNIN), which is supported by the National Science Foundation under NSF award no. ECS-0335765. CNS is part of Harvard University. C.B. acknowledges postdoctoral fellowships through the
Belgian American Educational Foundation (BAEF) as well as
Wallonie-Bruxelles International (Excellence grant WBI.WORLD) foundations.
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