In this paper, we present a novel route to manipulate the spontaneous valley coherence in two-dimensional valleytronic materials interfaced with other layered materials hosting anisotropic polaritonic modes. We propose two implementations - one, using anisotropic plasmons in phosphorene and another with hyperbolic phonon polaritons in α-MoO3. In particular, we show the electrostatic tunability of the spontaneous valley coherence achieving robust valley coherence values in the near-infrared wavelengths at room temperature. The tunability of this valley coherence shown in these heterostructures would enable the realization of active valleytronic quantum circuitry.
Bibliographical noteFunding Information:
A.K. acknowledges funding from the Department of Science and Technology Grants No. SB/S2/RJN-110/2017, No. ECR/2018/001485, and No. DST/NM/NS-2018/49. We thank K. Khaliji for helpful discussions.
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