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Multiple topological states in iron-based superconductors
Peng Zhang, Zhijun Wang, Xianxin Wu +24
Topological insulators and semimetals as well as unconventional iron-based superconductors have attracted major recent attention in condensed matter physics. Previously, however, l…
Van Hove singularities, chemical pressure and phonons: an angle-resolved photoemission study of KFeAs and CsFeAs
P. Richard, A. van Roekeghem, X. Shi +6
We report an angle-resolved photoemission spectroscopy (ARPES) study of KFeAs and CsFeAs, revealing the existence of a van Hove singularity affecting the electronic…
Continuous doping of a cuprate surface: new insights from in-situ ARPES
Y. G. Zhong, J. Y. Guan, X. Shi +10
The cuprate superconductors distinguish themselves from the conventional superconductors in that a small variation in the carrier doping can significantly change the superconductin…
Observation of a nodal chain with Dirac surface states in TiB2
C. -J. Yi, B. Q. Lv, Q. S. Wu +13
Topological nodal-line semimetals (TNLSMs) are characterized by symmetry-protected band crossings extending along one-dimensional lines in momentum space. The nodal lines exhibit a…
Experimental observation of bulk nodal lines and electronic surface states in ZrB
Rui Lou, Pengjie Guo, Man Li +14
Topological nodal-line semimetals are characterized by the line-contact bulk band crossings and the topological surface states. Breaking certain protecting symmetry turns this syst…
Trivial topological phase of CaAgP and the topological nodal-line transition in CaAg(P1-xAsx)
N. Xu, Y. T. Qian, Q. S. Wu +14
By performing angle-resolved photoemission spectroscopy and first-principles calculations, we address the topological phase of CaAgP and investigate the topological phase transitio…