The study of unconventional superconducting materials remains an active frontier of condensed matter physics. Exotic superconductivity, such as high TC, topological, and heavy-fermion superconductors, often rely on phase sensitive measurements to determine the underlying pairing and/or the nature of novel excitations. In this talk I will detail the use of Josephson effect to detect novel properties of two multiband superconducting systems: NbSe2  and SnTe . Focus will primarily be given modification of conventional Josephson effects due to the loss of time reversal symmetry found to exist in proximity-induced Josephson junctions of SnTe nanowires . These works open new routes to exploration of multiband effects in superconductors and have important implications for topological states in superconducting materials.
 S. Tran, J. Sell and J. R. Williams, “Dynamical Josephson Effects in NbSe2”, arXiv:1903.00453 (2019).
 C. J. Trimble et al., “Josephson Detection of Time Reversal Symmetry Broken Superconductivity in SnTe Nanowires”, arXiv:1907.04199 (2019).
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James Williams received his B.S. in 2002 from Santa Clara University and his Ph.D. in 2009 from Harvard University. His area of research is experimental condensed matter physics. Specifically, he specializes in understanding why certain one and two-dimensional materials (e.g. topological insulators, graphene) depart from normal conductivity provided by free electrons.