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Classification of Critical Points in Energy Bands Based on Topology, Scaling and Symmetry
Noah F. Q. Yuan, Liang Fu
A critical point of the energy dispersion is the momentum where electron velocity vanishes. At the corresponding energy, the density of states (DOS) exhibits non-analyticity such a…
Moiré quantum chemistry: charge transfer in transition metal dichalcogenide superlattices
Yang Zhang, Noah F. Q. Yuan, Liang Fu
Transition metal dichalcogenide (TMD) bilayers have recently emerged as a robust and tunable moiré system for studying and designing correlated electron physics. In this work, by c…
Josephson Detection of Time Reversal Symmetry Broken Superconductivity in SnTe Nanowires
C. J. Trimble, M. T. Wei, N. F. Q. Yuan +8
Exotic superconductors, such as high T, topological, and heavy-fermion superconductors, require phase sensitive measurements to determine the underlying pairing. Here we invest…
Observation of multiple types of topological fermions in PdBiSe
B. Q. Lv, Z. -L. Feng, J. -Z. Zhao +12
Topological semimetals with different types of band crossings provide a rich platform to realize novel fermionic excitations, known as topological fermions. In particular, some fer…
Enhanced Superconductivity in Monolayer -MoTe with Tilted Ising Spin Texture
Daniel Rhodes, Noah F. Yuan, Younghun Jung +13
Crystalline two-dimensional (2D) superconductors with low carrier density are an exciting new class of materials in which superconductivity coexists with strong interactions, the e…
Designing Flat Band by Strain
Zhen Bi, Noah F. Q. Yuan, Liang Fu
We study the effects of heterostrain on moiré bands in twisted bilayer graphene and bilayer transition metal dichalcogenide (TMD) systems. For bilayer graphene with twist angle nea…
Magic of high order van Hove singularity
Noah F. Q. Yuan, Hiroki Isobe, Liang Fu
We introduce a new type of van Hove singularity in two dimensions, where a saddle point in momentum space is changed from second-order to high-order. Correspondingly, the density o…