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arXiv 2103.16586cond-mat.str-elcond-mat.mes-hallcond-mat.mtrl-sci
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二维电子零场Wigner结晶跃迁附近的竞争关联态

Competing correlated states around the zero field Wigner crystallization transition of electrons in two-dimensions

Joseph Falson, Inti Sodemann, Brian Skinner, Daniela Tabrea, Yusuke Kozuka, Atsushi Tsukazaki, Masashi Kawasaki, Klaus von Klitzing, Jurgen H Smet

摘要:

电子系统中的动能和库仑相互作用之间的竞争可以导致复杂的多体基态与竞争的超导,电荷密度波和磁序。在这里,我们研究了一个强相互作用的氧化锌为基础的高迁移率的二维电子系统,显示了可调的金属-绝缘体转变的低温相。通过对电子输运对温度、载流子密度、面内和垂直磁场以及电压偏置的依赖性的全面分析,我们为存在具有不同程度自旋极化的竞争相关金属态和绝缘态提供了证据。我们的系统具有前所未有的水平的协议与国家的最先进的量子蒙特卡罗相图的理想的jeltron模型,包括魏格纳结晶过渡的相互作用参数$r_s\sim 30$的值和一个纯粹的Stoner过渡的情况下。面内场依赖性的运输揭示了一个新的低温状态与部分自旋极化分离的自旋非极化金属和维格纳晶体,我们检查对可能的理论方案,如反铁磁晶体,库仑诱导的微乳液,和无序驱动的水坑形成。

英文摘要:

The competition between kinetic energy and Coulomb interactions in electronic systems can lead to complex many-body ground states with competing superconducting, charge density wave, and magnetic orders. Here we study the low temperature phases of a strongly interacting zinc-oxide-based high mobility two dimensional electron system that displays a tunable metal-insulator transition. Through a comprehensive analysis of the dependence of electronic transport on temperature, carrier density, in-plane and perpendicular magnetic fields, and voltage bias, we provide evidence for the existence of competing correlated metallic and insulating states with varying degrees of spin polarization. Our system features an unprecedented level of agreement with the state-of-the-art Quantum Monte Carlo phase diagram of the ideal jellium model, including a Wigner crystallization transition at a value of the interaction parameter $r_s\sim 30$ and the absence of a pure Stoner transition. In-plane field dependence of transport reveals a new low temperature state with partial spin polarization separating the spin unpolarized metal and the Wigner crystal, which we examine against possible theoretical scenarios such as an anti-ferromagnetic crystal, Coulomb induced micro-emulsions, and disorder driven puddle formation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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