scholarly journals Experimental observation of optical Weyl points and Fermi arc-like surface states

2017 ◽  
Vol 13 (6) ◽  
pp. 611-617 ◽  
Author(s):  
Jiho Noh ◽  
Sheng Huang ◽  
Daniel Leykam ◽  
Y. D. Chong ◽  
Kevin P. Chen ◽  
...  
Keyword(s):  
Experimental Observation ◽  
Surface States ◽  
Fermi Arc

scholarly journals Experimental observation of drumhead surface states in SrAs3

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
M. Mofazzel Hosen ◽  
Gyanendra Dhakal ◽  
Baokai Wang ◽  
Narayan Poudel ◽  
Klauss Dimitri ◽  
...  
Keyword(s):  
Experimental Observation ◽  
Surface States

scholarly journals Experimental Observation of Acoustic Weyl Points and Topological Surface States

2018 ◽  
Vol 10 (1) ◽  
Author(s):  
Hao Ge ◽  
Xu Ni ◽  
Yuan Tian ◽  
Samit Kumar Gupta ◽  
Ming-Hui Lu ◽  
...  
Keyword(s):  
Experimental Observation ◽  
Surface States ◽  
Topological Surface

scholarly journals Topological semimetal and Fermi-arc surface states in the electronic structure of pyrochlore iridates

2011 ◽  
Vol 83 (20) ◽  
Author(s):  
Xiangang Wan ◽  
Ari M. Turner ◽  
Ashvin Vishwanath ◽  
Sergey Y. Savrasov
Keyword(s):  
Electronic Structure ◽  
Surface States ◽  
Fermi Arc ◽  
Topological Semimetal

scholarly journals Intrinsic coupling between spatially-separated surface Fermi-arcs in Weyl orbit quantum Hall states

2020 ◽  
Author(s):  
Shinichi Nishihaya ◽  
Masaki Uchida ◽  
Yusuke Nakazawa ◽  
Markus Kriener ◽  
Yasujiro Taguchi ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
Recent Observation ◽  
Quantum Hall ◽  
Three Dimensional ◽  
Surface States ◽  
Back Gate ◽  
Fermi Arc ◽  
Quantum Hall States ◽  
Topological Semimetals ◽  
Hall States

Abstract Topological semimetals hosting bulk Weyl points and surface Fermi-arc states are expected to realize unconventional Weyl orbits, which interconnect two surface Fermi-arc states on opposite sample surfaces under magnetic fields. While the presence of Weyl orbits has been proposed to play a vital role in recent observation of quantum Hall effect even in three-dimensional topological semimetals, actual spatial distribution of the quantized surface transport has been experimentally elusive. Here, we demonstrate intrinsic coupling between two spatially-separated surface states in the Weyl orbits by measuring a dual-gate device of a Dirac semimetal film. Independent scans of top- and back-gate voltages reveal concomitant modulation of doubly-degenerate quantum Hall states, which is not possible in conventional surface orbits as in topological insulators. Our results evidencing the unique spatial distribution of Weyl orbits provide new opportunities for controlling the novel quantized transport by various means such as external fields and interface engineering.

scholarly journals Nontrivial superconductivity in topological MoTe2−xSx crystals

2018 ◽  
Vol 115 (38) ◽  
pp. 9503-9508 ◽  
Author(s):  
Yanan Li ◽  
Qiangqiang Gu ◽  
Chen Chen ◽  
Jun Zhang ◽  
Qin Liu ◽  
...  
Keyword(s):  
Surface States ◽  
Sample Surface ◽  
Scanning Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Fermi Arc ◽  
Topological Features ◽  
Fermi Arcs ◽  
Unique Material ◽  
Pairing Model

Topological Weyl semimetals (TWSs) with pairs of Weyl points and topologically protected Fermi arc states have broadened the classification of topological phases and provide superior platform for study of topological superconductivity. Here we report the nontrivial superconductivity and topological features of sulfur-doped Td-phase MoTe2 with enhanced Tc compared with type-II TWS MoTe2. It is found that Td-phase S-doped MoTe2 (MoTe2−xSx, x ∼ 0.2) is a two-band s-wave bulk superconductor (∼0.13 meV and 0.26 meV), where the superconducting behavior can be explained by the s+− pairing model. Further, measurements of the quasi-particle interference (QPI) patterns and a comparison with band-structure calculations reveal the existence of Fermi arcs in MoTe2−xSx. More interestingly, a relatively large superconducting gap (∼1.7 meV) is detected by scanning tunneling spectroscopy on the sample surface, showing a hint of topological nontrivial superconductivity based on the pairing of Fermi arc surface states. Our work demonstrates that the Td-phase MoTe2−xSx is not only a promising topological superconductor candidate but also a unique material for study of s+− superconductivity.

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