Valley-dependent tunneling through electrostatically created quantum dots in heterostructures of graphene with hexagonal boron nitride

Belayadi, Adel; Vasilopoulos, P.; Abbout, Adel

doi:10.1103/physrevb.108.085419

Cited by 4 publications

(2 citation statements)

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“…Such features (but with electron confinement) have been observed in graphene with gate-defined quantum dots [37,38]. The incident electrons are trapped without internal reflections that occur when they are confined inside the QDs [27,28]. In our case, the confinement occurs outside them, between the left and right QDs, and results from the vanishing of the inter-dot hopping when we vary D LR .…”

Section: Valley-hall Signals and Valley Quasi-bound States In Aqdssupporting

confidence: 61%

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Gate-Tunable Asymmetric Quantum Dots in Graphene-Based Heterostructures: Pure Valley Polarization and Confinement

Belayadi,

Vasilopoulos

2024

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We explore the possibility of attaining valley-dependent tunnelling and confinement using proximity-induced spin-orbit couplings (SOCs) in graphene-based heterostructures. We consider gate-tunable asymmetric quantum dots (AQDs) on graphene heterostructures and exhibiting a C3v and/or C6v symmetry. By employing a tight-binding model, we explicitly reveal a pure valley confinement and valley signal in AQDs by streaming the valley local density, leading to valley-charge separation in real space. The confinement of the valley quasi-bound states is sensitive to the locally induced SOCs and to the spatial distribution of the induced AQDs; it is also robust against on-site disorder. The adopted process of attaining a pure valley-Hall conductivity and confinement with zero charge currents is expected to provide more options towards valley-dependent electron optics.

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Section: Valley-hall Signals and Valley Quasi-bound States In Aqdssupporting

confidence: 61%

“…Recent advances in achieving quantum confinement in graphene-based systems have opened new paths to lifting the valley degeneracy, using graphene quantum dots (GQDs) and the induced effects by electrostatic potentials and magnetic or pseudo-magnetic fields in nanobubble QDs [9,[27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%