Journal
PHYSICAL REVIEW B
Volume 99, Issue 24, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.99.245106
Keywords
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Funding
- Ministry of Science and Technology (Taiwan) [107-2917-I-564-009]
- Spanish Ministerio de Economia y Competitividad (MINECO) [FIS2014-55987-P, FIS2017-82804-P]
- Taiwan's National Center of Theoretical Sciences
- DOE Basic Energy Sciences [DE-FG02-02ER45958]
- U.S. Department of Energy (DOE) [DE-FG02-02ER45958] Funding Source: U.S. Department of Energy (DOE)
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In addition to spin, electrons in many Dirac materials possess an additional pseudospin degree of freedom known as valley. In materials where the spin and valley degrees of freedom are weakly coupled, they can be both excited and controlled independently. In this work, we study a model describing the interplay of the spin and valley Hall effects in such two-dimensional materials. We demonstrate the emergence of an additional longitudinal neutral current that is both spin and valley polarized. The additional neutral current allows to control the spin density by tuning the magnitude of the valley Hall effect. In addition, the interplay of the two effects can suppress the Hanle oscillation, that is, the oscillation of the nonlocal resistance of a Hall bar device with in-plane magnetic field. The latter observation provides a possible explanation for the absence of the Hanle oscillation in a number of recent experiments. Our work also opens the possibility to engineer the conversion between the valley and spin degrees of freedom in two-dimensional materials.
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