Zong Qi Jun, Wang Haolin, Zhang Qi, Cheng Xinle, He Yangchen, Xu Qiaoling, Fischer Ammon, Watanabe Kenji, Taniguchi Takashi, Rhodes Daniel A, Xian Lede, Kennes Dante M, Rubio Angel, Yu Geliang, Wang Lei
National Laboratory of Solid-State Microstructures, School of Physics and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China.
School of Advanced Materials and Nanotechnology, Xidian University, Xi'an, China.
Nat Commun. 2025 Apr 30;16(1):4058. doi: 10.1038/s41467-025-59365-2.
Electrons can form an ordered solid crystal phase ascribed to the interplay between Coulomb repulsion and kinetic energy. Tuning these energy scales can drive a phase transition from electron solid to liquid, i.e., melting of Wigner crystal. Generalized Wigner crystals (GWCs) pinned to moiré superlattices have been reported by optical and scanning-probe-based methods. Using transport measurements to investigate GWCs is vital to a complete characterization, however, still poses a significant challenge due to difficulties in making reliable electrical contacts. Here, we report the electrical transport detection of GWCs at fractional fillings ν = 2/5, 1/2, 3/5, 2/3, 8/9, 10/9, and 4/3 in twisted bilayer MoSe. We further observe that these GWCs undergo continuous quantum melting transitions to liquid phases by tuning doping density, magnetic and displacement fields, manifested by quantum critical scaling behaviors. Our findings establish twisted bilayer MoSe as a novel system to study strongly correlated states of matter and their quantum phase transitions.
电子可以形成一种有序的固体晶体相，这归因于库仑排斥力和动能之间的相互作用。调节这些能量尺度可以驱动从电子固体到液体的相变，即维格纳晶体的熔化。通过基于光学和扫描探针的方法，已经报道了固定在莫尔超晶格上的广义维格纳晶体（GWC）。然而，使用输运测量来研究GWC对于完整表征至关重要，但由于难以制作可靠的电接触，这仍然是一个重大挑战。在这里，我们报告了在扭曲双层MoSe中分数填充ν = 2/5、1/2、3/5、2/3、8/9、10/9和4/3时GWC的电输运检测。我们进一步观察到，通过调节掺杂密度、磁场和位移场，这些GWC经历连续的量子熔化转变为液相，表现为量子临界标度行为。我们的发现将扭曲双层MoSe确立为研究强关联物质状态及其量子相变的新型系统。
