arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2303.01447cond-mat.str-elcond-mat.mes-hallcond-mat.mtrl-sci
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过渡金属二硫族化合物4 Hb- TaS2的一级量子相变

First Order Quantum Phase Transition in the Hybrid Metal-Mott Insulator Transition Metal Dichalcogenide 4Hb-TaS2

Abhay Kumar Nayak, Aviram Steinbok, Yotam Roet, Jayhun Koo, Irena Feldman, Avior Almoalem, Amit Kanigel, Binghai Yan, Achim Rosch, Nurit Avraham, Haim Beidenkopf

摘要:

将不同的相关和拓扑非平凡的物质电子相耦合在一起可以潜在地诱导新的电子有序和它们之间的相变。过渡金属二硫属化物化合物是探索这种混合体系的基础。它们拥有各种奇异的电子相,它们的范德华性质使它们能够通过剥离和堆叠或化学计量生长来混合,从而诱导新的相关复合物。在这里,我们研究的化合物4 Hb-TaS $_2$,交织的莫特绝缘状态的1 T-TaS $_2$和假定的自旋液体,它的主机与金属状态的2 H-TaS $_2$和低温超导相,它拥有。我们揭示了一个热力学相图,主机之间的一个相关的近藤集群状态和一个平带状态,近藤集群成为耗尽的一阶量子相变。我们表明,这种本征过渡可以诱导由电场和温度,以及通过操纵的层间耦合与探针尖,从而允许可逆的近藤集群和平带状态之间的切换。这种相变表现为整个电子光谱的不连续变化,并伴有滞后和低频噪声。我们发现相变线的形状是由两个电子态的局域可压缩性和熵决定的。我们的研究结果设置这样的异质结构作为一个令人兴奋的平台,系统的调查和操作的莫特金属过渡和强相关的阶段和量子相变。

英文摘要:

Coupling together distinct correlated and topologically non-trivial electronic phases of matter can potentially induce novel electronic orders and phase transitions among them. Transition metal dichalcogenide compounds serve as a bedrock for exploration of such hybrid systems. They host a variety of exotic electronic phases and their Van der Waals nature enables to admix them, either by exfoliation and stacking or by stoichiometric growth, and thereby induce novel correlated complexes. Here we investigate the compound 4Hb-TaS$_2$ that interleaves the Mott-insulating state of 1T-TaS$_2$ and the putative spin liquid it hosts together with the metallic state of 2H-TaS$_2$ and the low temperature superconducting phase it harbors. We reveal a thermodynamic phase diagram that hosts a first order quantum phase transition between a correlated Kondo cluster state and a flat band state in which the Kondo cluster becomes depleted. We demonstrate that this intrinsic transition can be induced by an electric field and temperature as well as by manipulation of the interlayer coupling with the probe tip, hence allowing to reversibly toggle between the Kondo cluster and the flat band states. The phase transition is manifested by a discontinuous change of the complete electronic spectrum accompanied by hysteresis and low frequency noise. We find that the shape of the transition line in the phase diagram is determined by the local compressibility and the entropy of the two electronic states. Our findings set such heterogeneous structures as an exciting platform for systematic investigation and manipulation of Mott-metal transitions and strongly correlated phases and quantum phase transitions therein.

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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