Tunable valley splitting and anomalous valley Hall effect in VTe₂/Ga₂S₃ heterostructures

Abstract

The modulation of valley splitting is not only of fundamental interest but also crucial to valleytronics. Generally, valley splitting stems from spin-orbit coupling and the absence of time-reversal symmetry which...

Tunable valley-selective circular polarization in vdW multilayers consisting of inversion-symmetric monolayers

“…16 Our prior work demonstrated that valley carriers with different spins can distribute in different layers by reversing the ferroelectric polarization of the substrate in the VTe 2 /Ga 2 S 3 heterostructure. 17 Meanwhile, the layer Hall effect with electrons from the top and bottom (btm) layers spontaneously deflecting in opposite directions was also observed in 2D topological axion antiferromagnet MnBi 2 Te 4 . 18 Additionally, valley polarization can also be realized via the valley selective circular dichroism effect where only the electrons in the K (K′) valley are excited by left- (right-) polarized light, 2,6,19 as demonstrated in many 2D materials without T , such as transition metal dichalcogenides (TMDs).…”

Recent progress on valley polarization and valley-polarized topological states in two-dimensional materials

“…[65] The details of the valley-polarized QAHE will be discussed in the next section. In recent years, there have been many works to realize the electrical control of valley DOF by forming heterostructures between multiferroic materials and other materials, [28,[66][67][68][69][70][71] such as AgBiP 2 S 6 /CrBr 3 vdW heterostructures with ferromagnetism, ferroelectricity and valley behavior. At the minimum of the conduction band located at the +K/ − K point, a spin splitting of 423.1 meV occurs.…”

Reversible nonvolatile control of the anomalous valley Hall effect in two-dimensional multiferroic materials based on GdGe2

“…22 Realizing the nonvolatile electric field control of the AVH effect is of great significance for designing nonvolatile memory and switching devices using the valley degree of freedom. 23 A van der Waals heterostructure [24][25][26][27] allows integrating materials with distinct properties. Constructing a heterostructure is a simple and easy way to couple FE and ferrovalley, through which the AVH effect can be controlled via applying an a State Key Laboratory of Solidification Processing, Center for Advanced Lubrication electrical field.…”

“…A van der Waals heterostructure 24–27 allows integrating materials with distinct properties. Constructing a heterostructure is a simple and easy way to couple FE and ferrovalley, through which the AVH effect can be controlled via applying an electrical field.…”