TY - JOUR
T1 - Current-Driven to Thermally Driven Multistep Phase Transition of Charge Density Wave Order in 1T-TaS2
AU - Yang, Qianyi
AU - Shi, Wu
AU - Zhong, Zhipeng
AU - Li, Xiang
AU - Li, Yan
AU - Meng, Xiangjian
AU - Wang, Jianlu
AU - Chu, Junhao
AU - Huang, Hai
N1 - Publisher Copyright:
© 2024 American Chemical Society.
PY - 2024/12/25
Y1 - 2024/12/25
N2 - Two-dimensional 1T-TaS2 is renowned for its exotic physical properties including superconductivity, Mott physics, flat-band electronics, and charge density wave (CDW) orders. In particular, the CDW phase transitions (PTs) in 1T-TaS2 attracted extensive research interest, showing prominent potential in electronic devices. However, mechanisms underlying electrically driven PTs remain elusive. Here, we systematically studied the evolution of multistep PTs during the I-V sweep in 1T-TaS2. Comprehensive investigations, covering variations in temperature, pulsed voltage duration, and light illumination, reveal that the underlying PT mechanism shifts from current-driven to thermally driven with increasing current. Initially, the current-driven PT step occurs at a constant current density, independent of the temperature. Subsequently, thermally driven PT steps manifest at a constant conductivity highly sensitive to the thermal effect. These transitions are strongly associated with the metastable CDW electronic structures and their response to carrier injection and thermal variations. Our findings reconcile long-standing debates regarding the electrically driven CDW PTs in 1T-TaS2.
AB - Two-dimensional 1T-TaS2 is renowned for its exotic physical properties including superconductivity, Mott physics, flat-band electronics, and charge density wave (CDW) orders. In particular, the CDW phase transitions (PTs) in 1T-TaS2 attracted extensive research interest, showing prominent potential in electronic devices. However, mechanisms underlying electrically driven PTs remain elusive. Here, we systematically studied the evolution of multistep PTs during the I-V sweep in 1T-TaS2. Comprehensive investigations, covering variations in temperature, pulsed voltage duration, and light illumination, reveal that the underlying PT mechanism shifts from current-driven to thermally driven with increasing current. Initially, the current-driven PT step occurs at a constant current density, independent of the temperature. Subsequently, thermally driven PT steps manifest at a constant conductivity highly sensitive to the thermal effect. These transitions are strongly associated with the metastable CDW electronic structures and their response to carrier injection and thermal variations. Our findings reconcile long-standing debates regarding the electrically driven CDW PTs in 1T-TaS2.
KW - 1T-TaS
KW - Charge density wave
KW - Electrically driven phase transition
KW - Light-induced phase transition
UR - https://www.scopus.com/pages/publications/85212058777
U2 - 10.1021/acs.nanolett.4c05302
DO - 10.1021/acs.nanolett.4c05302
M3 - 文章
C2 - 39665786
AN - SCOPUS:85212058777
SN - 1530-6984
VL - 24
SP - 16417
EP - 16425
JO - Nano Letters
JF - Nano Letters
IS - 51
ER -