scholarly journals Quantum spin Hall insulator with a large bandgap, Dirac fermions, and bilayer graphene analog

2018 ◽  
Vol 4 (4) ◽  
pp. eaap7529 ◽  
Author(s):  
Sergey S. Krishtopenko ◽  
Frédéric Teppe
Keyword(s):  
Bilayer Graphene ◽  
Quantum Spin ◽  
Dirac Fermions ◽  
Quantum Spin Hall

scholarly journals Band topology and the quantum spin Hall effect in bilayer graphene

2011 ◽  
Vol 151 (16) ◽  
pp. 1075-1083 ◽  
Author(s):  
E. Prada ◽  
P. San-Jose ◽  
L. Brey ◽  
H.A. Fertig
Keyword(s):  
Hall Effect ◽  
Bilayer Graphene ◽  
Quantum Spin ◽  
Spin Hall Effect ◽  
Quantum Spin Hall Effect ◽  
Quantum Spin Hall

scholarly journals Topological flat band, Dirac fermions and quantum spin Hall phase in 2D Archimedean lattices

2019 ◽  
Vol 21 (40) ◽  
pp. 22344-22350 ◽  
Author(s):  
F. Crasto de Lima ◽  
Gerson J. Ferreira ◽  
R. H. Miwa
Keyword(s):  
Electronic Structure ◽  
Electronic Properties ◽  
Quantum Spin ◽  
Flat Band ◽  
Type I ◽  
Topological Phases ◽  
Dirac Fermions ◽  
Flat Bands ◽  
Quantum Spin Hall

We've constructed a guide to the electronic properties and topological phases of Archimedean lattices. Within these lattices, a rich electronic structure emerges forming type-I and II Dirac fermions, topological flat bands and high-degeneracy points.

scholarly journals Deconfinement of Mott localized electrons into topological and spin–orbit-coupled Dirac fermions

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
José M. Pizarro ◽  
Severino Adler ◽  
Karim Zantout ◽  
Thomas Mertz ◽  
Paolo Barone ◽  
...  
Keyword(s):  
Phase Transition ◽  
Tricritical Point ◽  
Density Wave ◽  
Wave Pattern ◽  
Quantum Spin ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Dirac Fermions ◽  
Spin Orbit ◽  
Quantum Spin Hall

Abstract The interplay of electronic correlations, spin–orbit coupling and topology holds promise for the realization of exotic states of quantum matter. Models of strongly interacting electrons on honeycomb lattices have revealed rich phase diagrams featuring unconventional quantum states including chiral superconductivity and correlated quantum spin Hall insulators intertwining with complex magnetic order. Material realizations of these electronic states are, however, scarce or inexistent. In this work, we propose and show that stacking 1T-TaSe2 into bilayers can deconfine electrons from a deep Mott insulating state in the monolayer to a system of correlated Dirac fermions subject to sizable spin–orbit coupling in the bilayer. 1T-TaSe2 develops a Star-of-David charge density wave pattern in each layer. When the Star-of-David centers belonging to two adyacent layers are stacked in a honeycomb pattern, the system realizes a generalized Kane–Mele–Hubbard model in a regime where Dirac semimetallic states are subject to significant Mott–Hubbard interactions and spin–orbit coupling. At charge neutrality, the system is close to a quantum phase transition between a quantum spin Hall and an antiferromagnetic insulator. We identify a perpendicular electric field and the twisting angle as two knobs to control topology and spin–orbit coupling in the system. Their combination can drive it across hitherto unexplored grounds of correlated electron physics, including a quantum tricritical point and an exotic first-order topological phase transition.

scholarly journals Quantum spin Hall effect in twisted bilayer graphene

2D Materials ◽  
2017 ◽  
Vol 4 (2) ◽  
pp. 025027 ◽  
Author(s):  
F Finocchiaro ◽  
F Guinea ◽  
P San-Jose
Keyword(s):  
Hall Effect ◽  
Bilayer Graphene ◽  
Quantum Spin ◽  
Spin Hall Effect ◽  
Quantum Spin Hall Effect ◽  
Twisted Bilayer Graphene ◽  
Quantum Spin Hall

scholarly journals Design and realization of topological Dirac fermions on a triangular lattice

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Maximilian Bauernfeind ◽  
Jonas Erhardt ◽  
Philipp Eck ◽  
Pardeep K. Thakur ◽  
Judith Gabel ◽  
...  
Keyword(s):  
Triangular Lattice ◽  
Quantum Spin ◽  
Spin Orbit Coupling ◽  
Dirac Fermions ◽  
Spin Orbit ◽  
Hexagonal Symmetry ◽  
Tunneling Microscopy ◽  
Heavy Atoms ◽  
Strong Spin ◽  
Quantum Spin Hall

AbstractLarge-gap quantum spin Hall insulators are promising materials for room-temperature applications based on Dirac fermions. Key to engineer the topologically non-trivial band ordering and sizable band gaps is strong spin-orbit interaction. Following Kane and Mele’s original suggestion, one approach is to synthesize monolayers of heavy atoms with honeycomb coordination accommodated on templates with hexagonal symmetry. Yet, in the majority of cases, this recipe leads to triangular lattices, typically hosting metals or trivial insulators. Here, we conceive and realize “indenene”, a triangular monolayer of indium on SiC exhibiting non-trivial valley physics driven by local spin-orbit coupling, which prevails over inversion-symmetry breaking terms. By means of tunneling microscopy of the 2D bulk we identify the quantum spin Hall phase of this triangular lattice and unveil how a hidden honeycomb connectivity emerges from interference patterns in Bloch px ± ipy-derived wave functions.

A New Type of Large‐Gap Quantum Spin Hall Insulator Material ZrSe 5

2021 ◽  
Author(s):  
Xing Wang ◽  
Wenhui Wan ◽  
Yanfeng Ge ◽  
Jun Li ◽  
Yong Liu
Keyword(s):  
Quantum Spin ◽  
New Type ◽  
Quantum Spin Hall

scholarly journals Doping-Induced Quantum Spin Hall Insulator to Superconductor Transition

2021 ◽  
Vol 126 (20) ◽  
Author(s):  
Zhenjiu Wang ◽  
Yuhai Liu ◽  
Toshihiro Sato ◽  
Martin Hohenadler ◽  
Chong Wang ◽  
...  
Keyword(s):  
Quantum Spin ◽  
Quantum Spin Hall
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