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Crystal valley Hall effect
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DOI：10.1103/PhysRevB.111.094411.png)
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摘要
En 中文
Time-reversal symmetry is thought to be a necessary condition for realizing the valley Hall effect. However, if time-reversal symmetry is broken, whether the valley Hall effect can be realized has not been explored. In this paper, based on symmetry analysis and first-principles electronic structure calculations, we demonstrate that the valley Hall effect without time-reversal symmetry can be realized in two-dimensional altermagnetic materials Fe2WSe4 and Fe2WS4. Due to crystal symmetry being required, the valley Hall effect without timereversal symmetry is termed the crystal valley Hall effect. In addition, under uniaxial strain, both monolayer Fe2WSe4 and Fe2WS4 can realize the piezomagnetic effect. Under biaxial compressive stress, both monolayer Fe2WSe4 and Fe2WS4 will transform from the altermagnetic semiconductor phase to the bipolarized topological Weyl semimetal phase. Our paper not only provides another direction for exploring the valley Hall effect but also provides a good platform for exploring altermagnetic semiconductors and altermagnetic topological phase transitions.
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