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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	A charge-density-wave topological semimetal Wujun Shi , Benjamin J. Wieder , Holger L. Meyerheim , Yan Sun , Yang Zhang , Yiwei Li , Lei Shen , Yanpeng Qi , Lexian Yang , Jagannath Jena , Peter Werner , Klaus Koepernik , Stuart Parkin , Yulin Chen , Claudia Felser , B. Andrei Bernevig , Zhijun Wang Nature Physics 83 DOI: 10.1038/s41567-020-01104-z Show Abstract ▼ Abstract: Topological physics and strong electron–electron correlations in quantum materials are typically studied independently. However, there have been rapid recent developments in quantum materials in which topological phase transitions emerge when the single-particle band structure is modified by strong interactions. Here we demonstrate that the room-temperature phase of (TaSe4)2I is a Weyl semimetal with 24 pairs of Weyl nodes. Owing to its quasi-one-dimensional structure, (TaSe4)2I also hosts an established charge-density wave instability just below room temperature. We show that the charge-density wave in (TaSe4)2I couples the bulk Weyl points and opens a bandgap. The correlation-driven topological phase transition in (TaSe4)2I provides a route towards observing condensed-matter realizations of axion electrodynamics in the gapped regime, topological chiral response effects in the semimetallic phase, and represents an avenue for exploring the interplay of correlations and topology in a solid-state material.	Jan 2021
I05-ARPES	Topological Lifshitz transitions and Fermi arc manipulation in Weyl semimetal NbAs H. F. Yang , L. X. Yang , Z. K. Liu , Y. Sun , C. Chen , H. Peng , M. Schmidt , D. Prabhakaran , B. A. Bernevig , C. Felser , B. H. Yan , Y. L. Chen Nature Communications 10 DOI: 10.1038/s41467-019-11491-4 Diamond Proposal Number(s): [19310, 18005] Open Access Show Abstract ▼ Abstract: Surface Fermi arcs (SFAs), the unique open Fermi-surfaces (FSs) discovered recently in topological Weyl semimetals (TWSs), are unlike closed FSs in conventional materials and can give rise to many exotic phenomena, such as anomalous SFA-mediated quantum oscillations, chiral magnetic effects, three-dimensional quantum Hall effect, non-local voltage generation and anomalous electromagnetic wave transmission. Here, by using in-situ surface decoration, we demonstrate successful manipulation of the shape, size and even the connections of SFAs in a model TWS, NbAs, and observe their evolution that leads to an unusual topological Lifshitz transition not caused by the change of the carrier concentration. The phase transition teleports the SFAs between different parts of the surface Brillouin zone. Despite the dramatic surface evolution, the existence of SFAs is robust and each SFA remains tied to a pair of Weyl points of opposite chirality, as dictated by the bulk topology.	Aug 2019

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