Abstract
Using density functional theory calculations, we investigate the origin of the insulating phase and metal-insulator transition (MIT) in octahedral tantalum disulfide (1T-TaS2), a layered van der Waals material with a prominent two-dimensional (2D) charge density wave (CDW) order. We show that the MIT is driven not by the 2D order itself, but by the vertical ordering of the 2D CDWs or the 3D CDW order. We identify two exceptionally stable 3D CDW configurations; one is insulating and the other is metallic. The competition and mixing of the two CDW configurations account for many mysterious features of the MIT in 1T-TaS2, including the pressure- and doping-induced transitions and the hysteresis behavior. The present results emphasize that interlayer electronic ordering can play an important role in electronic phase transitions in layered materials.
| Original language | English |
|---|---|
| Article number | 106404 |
| Journal | Physical Review Letters |
| Volume | 122 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2019 Mar 14 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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Origin of the Insulating Phase and First-Order Metal-Insulator Transition in 1T-TaS2. / Lee, Sung Hoon; Goh, Jung Suk; Cho, Doohee.
In: Physical Review Letters, Vol. 122, No. 10, 106404, 14.03.2019.Research output: Contribution to journal › Article
TY - JOUR
T1 - Origin of the Insulating Phase and First-Order Metal-Insulator Transition in 1T-TaS2
AU - Lee, Sung Hoon
AU - Goh, Jung Suk
AU - Cho, Doohee
PY - 2019/3/14
Y1 - 2019/3/14
N2 - Using density functional theory calculations, we investigate the origin of the insulating phase and metal-insulator transition (MIT) in octahedral tantalum disulfide (1T-TaS2), a layered van der Waals material with a prominent two-dimensional (2D) charge density wave (CDW) order. We show that the MIT is driven not by the 2D order itself, but by the vertical ordering of the 2D CDWs or the 3D CDW order. We identify two exceptionally stable 3D CDW configurations; one is insulating and the other is metallic. The competition and mixing of the two CDW configurations account for many mysterious features of the MIT in 1T-TaS2, including the pressure- and doping-induced transitions and the hysteresis behavior. The present results emphasize that interlayer electronic ordering can play an important role in electronic phase transitions in layered materials.
AB - Using density functional theory calculations, we investigate the origin of the insulating phase and metal-insulator transition (MIT) in octahedral tantalum disulfide (1T-TaS2), a layered van der Waals material with a prominent two-dimensional (2D) charge density wave (CDW) order. We show that the MIT is driven not by the 2D order itself, but by the vertical ordering of the 2D CDWs or the 3D CDW order. We identify two exceptionally stable 3D CDW configurations; one is insulating and the other is metallic. The competition and mixing of the two CDW configurations account for many mysterious features of the MIT in 1T-TaS2, including the pressure- and doping-induced transitions and the hysteresis behavior. The present results emphasize that interlayer electronic ordering can play an important role in electronic phase transitions in layered materials.
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U2 - 10.1103/PhysRevLett.122.106404
DO - 10.1103/PhysRevLett.122.106404
M3 - Article
C2 - 30932651
AN - SCOPUS:85062986239
VL - 122
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 10
M1 - 106404
ER -