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• W3188397330 abstract "Two-dimensional (2D) valleytronic materials, exhibiting valley-contrasting physics, are both fundamentally intriguing and practically appealing to be used in nanoscale devices. In this work, through first-principles calculations and model analysis, we identify single-layer ${mathrm{Cr}}_{2}{mathrm{Se}}_{3}$ as a promising 2D valleytronic semiconductor. We reveal that single-layer ${mathrm{Cr}}_{2}{mathrm{Se}}_{3}$ is a ferromagnetic semiconductor and harbors valley features. In contrast to most previously reported similar systems suffering from a natural in-plane magnetization, it favors the robust out-of-plane magnetization. This, combined with the broken inversion symmetry and strong spin-orbit coupling strength, renders that a sizable valley polarization occurs spontaneously in single-layer ${mathrm{Cr}}_{2}{mathrm{Se}}_{3}$, thus facilitating the observation of intriguing anomalous valley Hall effect. More remarkably, by employing strain and ferroelectric substrate, the on-off switching of the valley polarization is realized in single-layer ${mathrm{Cr}}_{2}{mathrm{Se}}_{3}$. The underlying physics is discussed in detail. Our work provides a tantalizing candidate for realizing and manipulating the valley and spin physics." @default.
• W3188397330 created "2021-08-16" @default.
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• W3188397330 date "2021-08-05" @default.
• W3188397330 modified "2023-10-18" @default.
• W3188397330 title "Two-dimensional valleytronic semiconductor with spontaneous spin and valley polarization in single-layer <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>Cr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>" @default.
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• W3188397330 doi "https://doi.org/10.1103/physrevb.104.075105" @default.
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