单层石墨烯中ŒΩ = 0 量子霍尔铁磁体的消失体热流

IF 17.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
R. Delagrange, M. Garg, G. Le Breton, A. Zhang, Q. Dong, Y. Jin, K. Watanabe, T. Taniguchi, P. Roulleau, O. Maillet, P. Roche, F. D. Parmentier
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引用次数: 0

摘要

未掺杂的石墨烯是一种无间隙半导体;然而,当将其置于高垂直磁场下并冷却至低温时,石墨烯会出现绝缘状态。这种状态被称为ŒΩ'Äâ='Äâ0,是由于电子相互作用和n'Äâ='Äâ0朗道水平形成的平带中的四重自旋和谷退性之间的相互作用造成的。ŒΩ'Äâ='Äâ0基态的性质,包括其自旋和谷极化,仍在争论之中。在这里,我们观察到ŒΩ'Äâ='Äâ0 时单层的体热传输消失了,这与预期的基态相矛盾,基态即使在很低的温度下也有有限的热传导。我们的研究结果强调了进一步研究ŒΩ'Äâ='Äâ0性质的必要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Vanishing bulk heat flow in the ν = 0 quantum Hall ferromagnet in monolayer graphene

Vanishing bulk heat flow in the ν = 0 quantum Hall ferromagnet in monolayer graphene

Vanishing bulk heat flow in the ν = 0 quantum Hall ferromagnet in monolayer graphene
Undoped graphene is a gapless semiconductor; however, when placed under a high perpendicular magnetic field and cooled to low temperature, it develops an insulating state. This state, dubbed ν = 0, is due to the interplay between electronic interactions and the four-fold spin and valley degeneracies in the flat band formed by the n = 0 Landau level. The nature of the ground state of ν = 0, including its spin and valley polarization, is still under debate. Here we observe vanishing bulk thermal transport in monolayer at ν = 0, in contradiction with the expected ground state, which is predicted to have finite thermal conductance even at very low temperature. Our results highlight the need for further investigations on the nature of ν = 0. Charge-neutral graphene in the quantum Hall regime is known to be an insulator. Now thermal transport measurements show that it also does not conduct heat. This sheds light on the nature of the ground state in this regime.
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来源期刊
Nature Physics
Nature Physics 物理-物理:综合
CiteScore
30.40
自引率
2.00%
发文量
349
审稿时长
4-8 weeks
期刊介绍: Nature Physics is dedicated to publishing top-tier original research in physics with a fair and rigorous review process. It provides high visibility and access to a broad readership, maintaining high standards in copy editing and production, ensuring rapid publication, and maintaining independence from academic societies and other vested interests. The journal presents two main research paper formats: Letters and Articles. Alongside primary research, Nature Physics serves as a central source for valuable information within the physics community through Review Articles, News & Views, Research Highlights covering crucial developments across the physics literature, Commentaries, Book Reviews, and Correspondence.
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