1. Department of Mechanical Engineering and Materials Science Yale University New Haven CT 06511 USA
2. Energy Sciences Institute Yale West Campus Yale University West Haven CT 06525 USA
3. Department of Materials Science and Engineering and Materials Research Laboratory University of Illinois Urbana‐Champaign IL 61801 USA
4. Center for Research on Interface Structures and Phenomena Yale University New Haven CT 06511 USA
5. Department of Physics Yale University New Haven CT 06511 USA