Competing correlated states around the zero-field Wigner crystallization transition of electrons in two dimensions
Competing correlated states around the zero-field Wigner crystallization transition of electrons in two dimensions
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DOI：
10.1038/s41563-021-01166-1
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发表时间：
2021-12-23
期刊：
影响因子：
41.2
通讯作者：
Smet, J. H.
中科院分区：
文献类型：
--
作者：
Falson, J.;Sodemann, I.;Smet, J. H.
电子系统中动能和库仑相互作用之间的竞争导致了具有竞争阶数的复杂多体基态。在这里，我们提出了基于氧化锌的二维电子系统作为一个高迁移率的系统来研究强相互作用电子的低温相。对电子输运的分析提供了不同程度的自旋极化下竞争相关的金属态和绝缘态的证据。一些特征与量子蒙特卡罗模拟结果具有定量相似性，包括从顺磁性费米液体到维格纳晶体的过渡点和没有斯通纳跃迁。在非常低的温度下，我们解决了电子在相变中的非单调自旋极化，指向电子的低自旋相，以及在传统金属输运范式中难以理解的两个数量级的正磁电阻。这项工作建立了氧化锌作为研究二维强相关电子的平台。基于氧化锌的二维电子系统被证明是高迁移率的系统，能够研究强相互作用电子的低温相。
The competition between kinetic energy and Coulomb interactions in electronic systems leads to complex many-body ground states with competing orders. Here we present zinc oxide-based two-dimensional electron systems as a high-mobility system to study the low-temperature phases of strongly interacting electrons. An analysis of the electronic transport provides evidence for competing correlated metallic and insulating states with varying degrees of spin polarization. Some features bear quantitative resemblance to quantum Monte Carlo simulation results, including the transition point from the paramagnetic Fermi liquid to Wigner crystal and the absence of a Stoner transition. At very low temperatures, we resolve a non-monotonic spin polarizability of electrons across the phase transition, pointing towards a low spin phase of electrons, and a two-order-of-magnitude positive magnetoresistance that is challenging to understand within traditional metallic transport paradigms. This work establishes zinc oxide as a platform for studying strongly correlated electrons in two dimensions.Zinc oxide-based two-dimensional electron systems are demonstrated to be high-mobility systems that enable the study of low-temperature phases of strongly interacting electrons.