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Quantum criticality in twisted transition metal dichalcogenides

Ghiotto, Augusto ; Shih, En-Min ; Pereira, Giancarlo S. S. G ; Rhodes, Daniel A ; Kim, Bumho ; Zang, Jiawei ; Millis, Andrew J ; Watanabe, Kenji ; Taniguchi, Takashi ; Hone, James C ; Wang, Lei ; Dean, Cory R ; Abhay N. Pasupathy

Nature (London), 2021-09, Vol.597 (7876), p.345-349 [Periódico revisado por pares]

London: Nature Publishing Group

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Título:
Quantum criticality in twisted transition metal dichalcogenides
Autor: Ghiotto, Augusto ; Shih, En-Min ; Pereira, Giancarlo S. S. G ; Rhodes, Daniel A ; Kim, Bumho ; Zang, Jiawei ; Millis, Andrew J ; Watanabe, Kenji ; Taniguchi, Takashi ; Hone, James C ; Wang, Lei ; Dean, Cory R ; Abhay N. Pasupathy
Assuntos: Bandwidths ; Chemical properties ; Chemical research ; Electrical resistivity ; Fermi liquids ; Heterostructures ; Insulators ; Low temperature ; Metal-insulator transition ; Metals ; Phase transitions ; Quantum theory ; Residual resistivity ; Room temperature ; Temperature ; Thermal properties ; Transition metal compounds
É parte de: Nature (London), 2021-09, Vol.597 (7876), p.345-349
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
Descrição: Near the boundary between ordered and disordered quantum phases, several experiments have demonstrated metallic behaviour that defies the Landau Fermi paradigm.sup.1-5. In moiré heterostructures, gate-tuneable insulating phases driven by electronic correlations have been recently discovered.sup.6-23. Here, we use transport measurements to characterize metal-insulator transitions (MITs) in twisted WSe.sub.2 near half filling of the first moiré subband. We find that the MIT as a function of both density and displacement field is continuous. At the metal-insulator boundary, the resistivity displays strange metal behaviour at low temperatures, with dissipation comparable to that at the Planckian limit. Further into the metallic phase, Fermi liquid behaviour is recovered at low temperature, and this 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.sub.2 as a new platform to study doping and bandwidth-controlled metal-insulator quantum phase transitions on the triangular lattice.
Editor: London: Nature Publishing Group
Idioma: Inglês

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Quantum criticality in twisted transition metal dichalcogenides

Ghiotto, Augusto ; Shih, En-Min ; Pereira, Giancarlo S. S. G ; Rhodes, Daniel A ; Kim, Bumho ; Zang, Jiawei ; Millis, Andrew J ; Watanabe, Kenji ; Taniguchi, Takashi ; Hone, James C ; Wang, Lei ; Dean, Cory R ; Abhay N. Pasupathy

London: Nature Publishing Group

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