Hidden Physical Effects in Non-centrosymmetric Crystals

Abstract

Symmetry forbidden effects in crystals may emerge in a local environment that breaks the symmetries. Yet these hidden physical effects were only discussed in centrosymmetric crystals. Here we propose that hidden physical effects can be generalized to almost all crystallographic symmetric groups and hence reveal their universality and diversity. We systematically discuss certain symmetries in crystals that may induce hidden spin polarization (HSP), hidden berry curvature and hidden valley polarization, with a focus on a specific pattern of HSP whose winding directions of the in-plane spin vectors are the same for adjacent bands, dubbed anomalous HSP. Such an unprecedented spin pattern arises from relatively weak spin-dependent inter-sector interaction and is demonstrated in mirror-symmetric InSe by first-principles calculations. Unique electric field-dependent splitting into specific spatial polarization pattern may serve as an experimental signature of anomalous HSP. Our results reveal abundant hidden physical effects beyond centrosymmetric crystals and provide new platforms to discuss them for emergent physical effects and future applications.

References in corpus (5)

• Valley polarization in MoS2 monolayers by optical pumping
• Valley Dependent Optoelectronics from Inversion Symmetry Breaking
• Selective probing of hidden spin-polarized states in inversion-symmetric bulk MoS2
• Uncovering and tailoring hidden Rashba spin-orbit splitting in centrosymmetric crystals
• Intrinsic circular polarization in centrosymmetric stacks of transition-metal dichalcogenides

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• Layered Opposite Rashba Spin-Orbit Coupling in Bilayer Graphene: Loss of Spin Chirality, Symmetry Breaking and Topological Transition
• Investigation of the intrinsic hidden spin texture and spin-state segregation in centrosymmetric monolayer dichalcogenide: effectiveness of the electric-field approach
• Moiré Topology in Twisted Structures with Noncollinear Spin-Orbit Coupling