Quantum Criticality in Twisted Transition Metal Dichalcogenides
Augusto Ghiotto,En-Min Shih,Giancarlo S. S. G. Pereira,Daniel Rhodes,Bumho Kim,Jiawei Zang,Andrew J. Millis,Kenji Watanabe,Takashi Taniguchi,James Hone,Lei Wang,Lei Wang,Cory Dean,Abhay Pasupathy,Abhay Pasupathy +14 more
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In this article, the gate-driven metal-insulator transitions and the metallic phase in twisted WSe$_2$ near half filling of the first moir\'e subband are characterized.Abstract:
In moir\'e heterostructures, gate-tunable insulating phases driven by electronic correlations have been recently discovered. Here, we use transport measurements to characterize the gate-driven metal-insulator transitions and the metallic phase in twisted WSe$_2$ near half filling of the first moir\'e subband. We find that the metal-insulator transition as a function of both density and displacement field is continuous. At the metal-insulator boundary, the resistivity displays strange metal behaviour at low temperature with dissipation comparable to the Planckian limit. Further into the metallic phase, Fermi-liquid behaviour is recovered at low temperature which evolves into a quantum critical fan at intermediate temperatures before eventually reaching an anomalous saturated regime near room temperature. An analysis of the residual resistivity indicates the presence of strong quantum fluctuations in the insulating phase. These results establish twisted WSe$_2$ as a new platform to study doping and bandwidth controlled metal-insulator quantum phase transitions on the triangular lattice.read more
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