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Signatures of superconductivity and pseudogap formation in non-equilibrium nodal quasiparticles revealed by ultrafast angle-resolved photoemission
Wentao Zhang, Christopher L. Smallwood, Chris Jozwiak +5
We use time- and angle-resolved photoemission to measure the nodal non-equilibrium electronic states in various dopings of BiSrCaCuO. We find that the initial p…
Can deeply underdoped superconducting cuprates be topological superconductors?
Yuan-Ming Lu, Tao Xiang, Dung-Hai Lee
The nodal superconducting gap is a hallmark of the cuprate high T superconductors. Surprisingly recent angle-resolved photoemission spectroscopy of deeply underdo…
Gapped symmetric edges of symmetry protected topological phases
Yuan-Ming Lu, Dung-Hai Lee
Symmetry protected topological (SPT) phases are gapped quantum phases which host symmetry-protected gapless edge excitations. On the other hand, the edge states can be gapped by sp…
Bulk-Defect Correspondence in Particle-Hole Symmetric Insulators and Semimetals
Fernando de Juan, Andreas Rüegg, Dung-Hai Lee
Lattices with a basis can host crystallographic defects which share the same topological charge (e.g.~the Burgers vector of a dislocation) but differ in their microscopic…
Enhanced low-energy magnetic excitations via suppression of the itinerancy in Fe0.98-zCuzTe0.5Se0.5
Jinsheng Wen, Shichao Li, Zhijun Xu +12
We have performed resistivity and inelastic neutron scattering measurements on three samples of Fe0.98-zCuzTe0.5Se0.5 with z = 0, 0.02, and 0.1. It is found that with increasing Cu…
Fermiology, Orbital Order, Orbital Fluctuation and Cooper Pairing in Iron-based Superconductors
Fan Yang, Fa Wang, Dung-Hai Lee
We address two important issues that arise in recent studies of iron-based superconductivity. (1) Why are the T_c of A_xFe_{2-y}Se_2 and the single unit cell FeSe on SrTiO so h…
Photoelectron spin-flipping and texture manipulation in a topological insulator
Chris Jozwiak, Cheol-Hwan Park, Kenneth Gotlieb +8
Recently discovered materials called three-dimensional topological insulators constitute examples of symmetry protected topological states in the absence of applied magnetic fields…
Critical theories of phase transition between symmetry protected topological states and their relation to the gapless boundary theories
Xie Chen, Fa Wang, Yuan-Ming Lu +1
Symmetry protected topological states (SPTs) have the same symmetry and the phase transition between them are beyond Landau's symmetry breaking formalism. In this paper we study (1…