• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >Continuous Mott transition in semiconductor moire superlattices
【24h】

Continuous Mott transition in semiconductor moire superlattices

机译：半导体莫尔斯超级图中的连续卷发转换

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The evolution of a Landau Fermi liquid into a non-magnetic Mott insulator with increasing electronic interactions is one of the most puzzling quantum phase transitions in physics(1-6). The vicinity of the transition is believed to host exotic states of matter such as quantum spin liquids(4-7), exciton condensates(8) and unconventional superconductivity(1). Semiconductor moire materials realize a highly controllable Hubbard model simulator on a triangular lattice(9-22), providing a unique opportunity to drive a metal-insulator transition (MIT) via continuous tuning of the electronic interactions. Here, by electrically tuning the effective interaction strength in MoTe2/WSe2 moire superlattices, we observe a continuous MIT at a fixed filling of one electron per unit cell. The existence of quantum criticality is supported by the scaling collapse of the resistance, a continuously vanishing charge gap as the critical point is approached from the insulating side, and a diverging quasiparticle effective mass from the metallic side. We also observe a smooth evolution of the magnetic susceptibility across the MIT and no evidence of long-range magnetic order down to similar to 5% of the Curie-Weiss temperature. This signals an abundance of low-energy spinful excitations on the insulating side that is further corroborated by the Pomeranchuk effect observed on the metallic side. Our results are consistent with the universal critical theory of a continuous Mott transition in two dimensions(4,23).The interaction strength in moire superlattices is tuned to drive a continuous metal-to-insulator transition at a fixed electron density.
机译：Landau Fermi液体进入非磁性Mott绝缘体的升高，以增加电子相互作用是物理学（1-6）中最令人费解的量子相变之一。据信，过渡附近寄出异端物质状态，例如量子旋液（4-7），激子缩合物（8）和非传统超导（1）。半导体莫尔材料在三角形格子（9-22）上实现了一种高度可控的Hubbard模型模拟器，提供了通过连续调整电子交互来驱动金属绝缘体过渡（MIT）的独特机会。这里，通过在Mote2 / WSE2 Moire超晶格中电调节有效的相互作用强度，我们在每单位细胞的固定填充中观察连续的MIT。通过电阻的缩放塌陷来支持量子临界性的存在，从绝缘侧接近临界点的连续消失的电荷间隙，以及来自金属侧的发散Quasiparticle有效质量。我们还观察到整个麻省理工学院的磁化率的平滑演变，并且没有远程磁秩序的证据，以与居里 - 卫生温度的5％相似。这表示通过在金属侧观察到的Pomeranchuk效应进一步证实的绝缘侧上的高能纺丝激发。我们的结果与两维的连续卷曲过渡的普遍临界理论一致（4,23）一致。调谐莫尔超晶格中的相互作用强度以驱动固定电子密度的连续金属到绝缘体过渡。

著录项

  • 来源
    《Nature》 |2021年第7876期|350-354|共5页
  • 作者

    Li Tingxin; Jiang Shengwei; Li Lizhong; Zhang Yang; Kang Kaifei; Zhu Jiacheng; Watanabe Kenji; Taniguchi Takashi; Chowdhury Debanjan; Fu Liang; Shan Jie; Mak Kin Fai;

  • 作者单位

    Cornell Univ Sch Appl & Engn Phys Ithaca NY 14853 USA;

    Cornell Univ Lab Atom & Solid State Phys Ithaca NY 14850 USA;

    Cornell Univ Sch Appl & Engn Phys Ithaca NY 14853 USA;

    MIT Dept Phys Cambridge MA 02139 USA;

    Cornell Univ Sch Appl & Engn Phys Ithaca NY 14853 USA;

    Cornell Univ Sch Appl & Engn Phys Ithaca NY 14853 USA;

    Natl Inst Mat Sci Tsukuba Ibaraki Japan;

    Natl Inst Mat Sci Tsukuba Ibaraki Japan;

    Cornell Univ Lab Atom & Solid State Phys Ithaca NY 14850 USA;

    MIT Dept Phys Cambridge MA 02139 USA;

    Cornell Univ Sch Appl & Engn Phys Ithaca NY 14853 USA|Cornell Univ Lab Atom & Solid State Phys Ithaca NY 14850 USA|Kavli Inst Cornell Nanoscale Sci Ithaca NY 14853 USA;

    Cornell Univ Sch Appl & Engn Phys Ithaca NY 14853 USA|Cornell Univ Lab Atom & Solid State Phys Ithaca NY 14850 USA|Kavli Inst Cornell Nanoscale Sci Ithaca NY 14853 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号