Inversion-symmetry protected chiral hinge states in stacks of doped quantum Hall layers

Sander H. Kooi; Guido Van Miert; Carmine Ortix

doi:10.1103/PhysRevB.98.245102

Inversion-symmetry protected chiral hinge states in stacks of doped quantum Hall layers

Sander H. Kooi
, Guido Van Miert
, Carmine Ortix

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

We prove the existence of higher-order topological insulators with protected chiral hinge modes in quasi-two-dimensional systems made out of coupled layers stacked in an inversion-symmetric manner. In particular, we show that a homogeneous external magnetic field slightly tilted away from the stacking direction drives alternating p- and n-doped honeycomb sheets into a higher-order topological phase, characterized by a nontrivial three-dimensional Z2 invariant. We identify graphene, silicene, and phosphorene multilayers as potential material platforms for the experimental detection of this second-order topological insulating phase.

Original language	English
Article number	245102
Number of pages	5
Journal	Physical Review B
Volume	98
Issue number	24
DOIs	https://doi.org/10.1103/PhysRevB.98.245102
Publication status	Published - 3 Dec 2018

Funding

C.O. acknowledges support from a VIDI Grant (Project 680-47-543) financed by the Netherlands Organization for Scientific Research (NWO). This work is part of the research programme of the Foundation for Fundamental Research on Matter (FOM), which is part of the Netherlands Organization for Scientific Research (NWO). S.K. acknowledges support from a NWO-Graduate Program grant.

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title = "Inversion-symmetry protected chiral hinge states in stacks of doped quantum Hall layers",

abstract = "We prove the existence of higher-order topological insulators with protected chiral hinge modes in quasi-two-dimensional systems made out of coupled layers stacked in an inversion-symmetric manner. In particular, we show that a homogeneous external magnetic field slightly tilted away from the stacking direction drives alternating p- and n-doped honeycomb sheets into a higher-order topological phase, characterized by a nontrivial three-dimensional Z2 invariant. We identify graphene, silicene, and phosphorene multilayers as potential material platforms for the experimental detection of this second-order topological insulating phase.",

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AB - We prove the existence of higher-order topological insulators with protected chiral hinge modes in quasi-two-dimensional systems made out of coupled layers stacked in an inversion-symmetric manner. In particular, we show that a homogeneous external magnetic field slightly tilted away from the stacking direction drives alternating p- and n-doped honeycomb sheets into a higher-order topological phase, characterized by a nontrivial three-dimensional Z2 invariant. We identify graphene, silicene, and phosphorene multilayers as potential material platforms for the experimental detection of this second-order topological insulating phase.

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Inversion-symmetry protected chiral hinge states in stacks of doped quantum Hall layers

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