We acknowledge the financial support of the NSF through Grants DMR 1507844, DMR 1531373, and ECCS 1509706 and also the financial support of the Australian Research Council and the European Research Council (Grant No. 716471, ACrossWire). The Australian National Fabrication Facility (ACT Node) is acknowledged for access to the growth facility used in this work. The Australian Microscopy and Microanalysis Research Facility is acknowledged for access to the electron microscopes used in this work.
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