TY - JOUR

T1 - Edge states in a two-dimensional nonsymmorphic semimetal

AU - Matveeva, P. G.

AU - Aristov, D. N.

AU - Meidan, D.

AU - Gutman, D. B.

PY - 2019/2/6

Y1 - 2019/2/6

N2 - Dirac materials have unique transport properties, partly due to the presence of surface states. A new type of two-dimensional Dirac material, protected by nonsymmorphic symmetries, was recently proposed by S. M. Young and C. L. Kane [Phys. Rev. Lett. 115, 126803 (2015)10.1103/PhysRevLett.115.126803]. By breaking of time-reversal or inversion symmetry one can split the Dirac cones into Weyl nodes. The latter are characterized by local Chern numbers, which makes them two-dimensional analogs of Weyl semimetals. We find that the formation of the Weyl nodes is accompanied by an emergence of one-dimensional surface states, similar to Fermi arcs in Weyl semimetals and edge states in two-dimensional graphene. We explore these states for a quasi-one-dimensional nonsymmorphic ribbon. The type and strength of applied deformation control the location and Weyl nodes and their composition. This determines the properties of emerging edge states. The sensitivity of these edge states to the external deformations makes nonsymmorphic materials potentially useful as a new type of electromechanical sensor.

AB - Dirac materials have unique transport properties, partly due to the presence of surface states. A new type of two-dimensional Dirac material, protected by nonsymmorphic symmetries, was recently proposed by S. M. Young and C. L. Kane [Phys. Rev. Lett. 115, 126803 (2015)10.1103/PhysRevLett.115.126803]. By breaking of time-reversal or inversion symmetry one can split the Dirac cones into Weyl nodes. The latter are characterized by local Chern numbers, which makes them two-dimensional analogs of Weyl semimetals. We find that the formation of the Weyl nodes is accompanied by an emergence of one-dimensional surface states, similar to Fermi arcs in Weyl semimetals and edge states in two-dimensional graphene. We explore these states for a quasi-one-dimensional nonsymmorphic ribbon. The type and strength of applied deformation control the location and Weyl nodes and their composition. This determines the properties of emerging edge states. The sensitivity of these edge states to the external deformations makes nonsymmorphic materials potentially useful as a new type of electromechanical sensor.

KW - Surface states

KW - Chern numbers

KW - Deformation control

KW - Dirac cones

KW - Electro-mechanical sensors

KW - FERMI ARCS

KW - Inversion symmetry

KW - Quasi-one dimensional

KW - Time reversal

KW - Deformation

UR - http://www.scopus.com/inward/record.url?scp=85061373908&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.99.075409

DO - 10.1103/PhysRevB.99.075409

M3 - Article

AN - SCOPUS:85061373908

VL - 99

JO - Physical Review B-Condensed Matter

JF - Physical Review B-Condensed Matter

SN - 1098-0121

IS - 7

M1 - 075409

ER -