10.1021/acs.nanolett.8b04805.s001
Ziying Wang
Ziying
Wang
Leiqiang Chu
Leiqiang
Chu
Linjun Li
Linjun
Li
Ming Yang
Ming
Yang
Junyong Wang
Junyong
Wang
Goki Eda
Goki
Eda
Kian Ping Loh
Kian Ping
Loh
Modulating Charge Density Wave Order in a 1T-TaS<sub>2</sub>/Black Phosphorus Heterostructure
American Chemical Society
2019
theory calculations show
BP
CDW orders
CDW phase transition temperature
charge transfer
Coulomb blockade model
domain walls
CDW phase transition
van der Waals heterostructure
180 K
CDW phase
conductance oscillations
quantum dot arrays
Scanning tunneling microscopy study
1 T-TaS 2
1 T-TaS 2 nanoflake
Modulating Charge Density Wave Order
electron states
CDW stabilities
2 D heterostructure
NC phase
4.5 K
transport measurements
tunnelling barriers
Unusual gate-dependent conductance oscillations
charge density wave
2019-04-01 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Modulating_Charge_Density_Wave_Order_in_a_1T-TaS_sub_2_sub_Black_Phosphorus_Heterostructure/7960823
Controllability
of collective electron states has been a long-sought
scientific and technological goal and promises development of new
devices. Herein, we investigate the tuning of charge density wave
(CDW) in 1T-TaS<sub>2</sub> via a two-dimensional (2D) van der Waals
heterostructure of 1T-TaS<sub>2</sub>/BP. Unusual gate-dependent conductance
oscillations were observed in 1T-TaS<sub>2</sub> nanoflake supported
on BP in transport measurements. Scanning tunneling microscopy study
shows that the nearly commensurate (NC) CDW phase survived to 4.5
K in this system, which is substantially lower than the NC to commensurate
CDW phase transition temperature of 180 K. A Coulomb blockade model
was invoked to explain the conductance oscillations, where the domain
walls and domains in NC phase serve as series of quantum dot arrays
and tunnelling barriers, respectively. Density functional theory calculations
show that a range of interfacial interactions, including strain and
charge transfer, influences the CDW stabilities. Our work sheds light
on tuning CDW orders via 2D heterostructure stacking and provides
new insights on the CDW phase transition and sliding mechanism.