scholarly journals Effect of dimensionality and spin-orbit coupling on charge-density-wave transition in 2H-TaSe2

2012 ◽  
Vol 86 (10) ◽  
Author(s):  
Yizhi Ge ◽  
Amy Y. Liu
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit

scholarly journals Pressure induced superconductivity bordering a charge-density-wave state in NbTe4 with strong spin-orbit coupling

2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Xiaojun Yang ◽  
Yonghui Zhou ◽  
Mengmeng Wang ◽  
Hua Bai ◽  
Xuliang Chen ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Orbit Coupling ◽  
Spin Orbit Coupling ◽  
Spin Orbit ◽  
Wave State ◽  
A Charge ◽  
Strong Spin

scholarly journals A charge density wave-like instability in a doped spin–orbit-assisted weak Mott insulator

2017 ◽  
Vol 16 (2) ◽  
pp. 200-203 ◽  
Author(s):  
H. Chu ◽  
L. Zhao ◽  
A. de la Torre ◽  
T. Hogan ◽  
S. D. Wilson ◽  
...  
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Density Wave ◽  
Mott Insulator ◽  
Spin Orbit ◽  
A Charge

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.

Incommensurate modulated phases of the NbxTa1-xTe4 charge density wave system

1992 ◽  
Vol 50 (1) ◽  
pp. 58-59
Author(s):  
S. Ritchie ◽  
J. C. Bennett ◽  
A. Prodan ◽  
F.W. Boswell ◽  
J.M. Corbett
Keyword(s):  
Charge Density ◽  
Charge Density Wave ◽  
Direct Evidence ◽  
Density Wave ◽  
Wave System ◽  
Modulated Phases ◽  
Metal Atoms ◽  
Incommensurate Modulation ◽  
End Members ◽  
Modulation Wave Vector

A continuous sequence of compounds having composition NbxTa1-xTe4; 0 ≤ x ≤ 1 have been studied by electron diffraction and microscopy. Previous studies have shown that the end members of the series, TaTε4 and NbTε4 possess a quasi-one-dimensional character and exhibit charge density wave (CDW) distortions. In these compounds, the subcell structure is tetragonal with axes (a × a × c) and consists of the metal atoms (Nb or Ta) centered within an extended antiprismatic cage of Te atoms. At room temperature, TaTε4 has a commensurate modulation structure with a 2a × 2a × 3c unit cell. In NbTε4, an incommensurate modulation with × ∼ 16c axes is observed. Preliminary studies of the mixed compounds NbxTα1-xTε4 showed a discontinuous jump of the modulation wave vector commensurate to incommensurate when the Nb dopant concentration x, exceeded x ≃ 0.3, In this paper, the nature of the compositional dependence of is studied in greater detail and evidence is presented for a stepwise variation of . This constitutes the first direct evidence for a Devil's staircase in CDW materials.

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