Perfect Coulomb drag in a dipolar excitonic insulator

IF 44.7 1区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES

Science Pub Date : 2025-04-17 DOI:10.1126/science.adl1829

Phuong X. Nguyen, Liguo Ma, Raghav Chaturvedi, Kenji Watanabe, Takashi Taniguchi, Jie Shan, Kin Fai Mak

引用次数: 0

Abstract

Excitonic insulators (EIs) are a solid-state prototype for bosonic phases of matter that can support charge-neutral exciton currents. However, demonstration of exciton transport in EIs is difficult. In this work, we show that the strong interlayer excitonic correlation at equal electron and hole densities in MoSe₂/WSe₂ double layers separated by a 2-nanometer barrier yields perfect Coulomb drag under zero magnetic field: A charge current in one layer induces an equal but opposite drag current in the other layer at low temperatures. The drag current ratio remains above 0.9 up to about 20 kelvin. As exciton density increases above the Mott density, the excitons dissociate into an electron-hole plasma abruptly, and only frictional drag is observed. Our experiment may lead to the realization of exciton circuitry and superfluidity.

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偶极激子绝缘体中的完美库仑阻力

激子绝缘体（ei）是物质玻色子相的固态原型，可以支持电荷中性的激子电流。然而，证明激子在ei中的输运是困难的。在这项工作中，我们表明，在由2纳米势垒隔开的MoSe 2 /WSe 2双层中，在等电子密度和空穴密度下，层间的强激子相关性在零磁场下产生完美的库仑阻力：在低温下，一层中的电荷电流在另一层中诱导出相等但相反的阻力电流。阻力电流比保持在0.9以上，直到20开尔文左右。当激子密度增加到莫特密度以上时，激子突然解离成电子空穴等离子体，只观察到摩擦阻力。我们的实验可能导致激子电路和超流体的实现。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science 综合性期刊-综合性期刊

CiteScore

61.10

自引率

0.90%

发文量

审稿时长

2.1 months

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