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Quantum criticality in twisted transition metal dichalcogenides

机译：扭曲过渡金属二甲基甲基化物中的量子临界性

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摘要

Metal-to-insulator transitions are characterized in twisted WSe, revealing strange metal behaviour and quantum criticality at low temperatures.Near the boundary between ordered and disordered quantum phases, several experiments have demonstrated metallic behaviour that defies the Landau Fermi paradigm(1-5). In moire heterostructures, gate-tuneable insulating phases driven by electronic correlations have been recently discovered(6-23). Here, we use transport measurements to characterize metal-insulator transitions (MITs) in twisted WSe2 near half filling of the first moire 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 WSe2 as a new platform to study doping and bandwidth-controlled metal-insulator quantum phase transitions on the triangular lattice.
机译：金属到绝缘体过渡的特征在于扭曲的WSE，揭示了低温下的奇怪金属行为和量子临界性。有序和无序的量子阶段之间的边界，几个实验表明了定位Landau Fermi Paradigm的金属行为（1-5） 。在莫尔异质结构中，最近已经发现了由电子相关驱动的栅极可调的绝缘相（6-23）。在这里，我们使用运输测量来表征扭曲的WSE2中的金属绝缘体过渡（MITS），靠近第一莫尔潜艇的半填充。我们发现MIT作为两个密度和位移场的函数是连续的。在金属绝缘体边界处，电阻率在低温下显示奇怪的金属行为，耗散与普朗克极限相当。进一步进入金属相时，在低温下回收FERMI液体行为，并且这在中间温度下的量子临界风扇进入，之前最终在室温附近达到异常的饱和状态。对残留电阻率的分析表明绝缘阶段中存在强量子波动。这些结果将扭曲的WSE2建立为新平台，用于研究三角形格子上的掺杂和带宽控制的金属绝缘体量子转换。

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  • 来源
    《Nature》 |2021年第7876期|345-349|共5页
  • 作者

    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.; Pasupathy Abhay N.;

  • 作者单位

    Columbia Univ Dept Phys 538 W 120th St New York NY 10027 USA;

    Columbia Univ Dept Phys 538 W 120th St New York NY 10027 USA;

    Columbia Univ Dept Phys 538 W 120th St New York NY 10027 USA;

    Columbia Univ Dept Mech Engn New York NY 10027 USA;

    Columbia Univ Dept Mech Engn New York NY 10027 USA;

    Columbia Univ Dept Phys 538 W 120th St New York NY 10027 USA;

    Columbia Univ Dept Phys 538 W 120th St New York NY 10027 USA|Flatiron Inst Ctr Computat Quantum Phys New York NY USA;

    Natl Inst Mat Sci Tsukuba Ibaraki Japan;

    Natl Inst Mat Sci Tsukuba Ibaraki Japan;

    Columbia Univ Dept Mech Engn New York NY 10027 USA;

    Columbia Univ Dept Phys 538 W 120th St New York NY 10027 USA|Nanjing Univ Sch Phys Natl Lab Solid State Microstruct Nanjing Peoples R China;

    Columbia Univ Dept Phys 538 W 120th St New York NY 10027 USA;

    Columbia Univ Dept Phys 538 W 120th St New York NY 10027 USA|Brookhaven Natl Lab Condensed Matter Phys & Mat Sci Div Upton NY 11973 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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