SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 64: Topology: Other Topics
TT 64.1: Vortrag
Freitag, 31. März 2023, 09:30–09:45, HSZ 201
Fermi arc reconstruction in synthetic photonic lattice — •Duy Hoang Minh Nguyen1, Chiara Devescovi1, Dung Xuan Nguyen2, Hai Son Nguyen3,4, and Dario Bercioux1,5 — 1Donostia International Physics Center, 20018 Donostia-San Sebastian, Spain — 2Center for Theoretical Physics of Complex Systems, Institute for Basic Science (IBS), Daejeon, 34126, Republic of Korea — 3Univ Lyon, Ecole Centrale de Lyon, CNRS, INSA Lyon, Universite Claude Bernard Lyon 1, CPE Lyon, CNRS, INL, UMR5270, Ecully 69130, France — 4Institut Universitaire de France (IUF), F-75231 Paris, France — 5IKERBASQUE, Basque Foundation for Science, Euskadi Plaza, 5, 48009 Bilbao, Spain
The chiral surface states of Weyl semimetals are known for having an open Fermi surface called Fermi arc. At the interface between two Weyl semimetals, these Fermi arcs are predicted to potentially deform into unique interface states. In this work, we numerically study a one-dimensional (1D) dielectric trilayer grating where the relative displacements between adjacent layers play the role of two synthetic momenta. The lattice is described by an effective Hamiltonian whose spectral properties coincide closely with rigorous electromagnetic simulations. Our trilayer system is a simple but versatile platform that emulates 3D crystals without time-reversal symmetry, including Weyl semimetal, nodal line semimetal, and 3D Chern insulator. It allows us to not only observe phenomena such as the phase transition between Weyl semimetal and Chern insulator but also confirm the Fermi arc reconstruction between two Weyl semimetals.
[1] arXiv:2211.07230