Theoretical study of fermi arc plasmons in Weyl semimetals

Weyl semimetal is a type of crystals which host emergent quasiparticles that behave like Weyl fermions. In Weyl semimetals, the conduction band and the valence band cross at a single point in reciprocal space called the Weyl point. Quasiparticles near this point can be described by the Weyl equation...

Full description

Saved in:
Bibliographic Details
Main Author: Xiong, Ying
Other Authors: Chong Yidong
Format: Final Year Project
Language:English
Published: 2018
Subjects:
Online Access:http://hdl.handle.net/10356/74135
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-74135
record_format dspace
spelling sg-ntu-dr.10356-741352023-02-28T23:18:27Z Theoretical study of fermi arc plasmons in Weyl semimetals Xiong, Ying Chong Yidong Song Justin School of Physical and Mathematical Sciences DRNTU::Science::Physics::Atomic physics::Solid state physics Weyl semimetal is a type of crystals which host emergent quasiparticles that behave like Weyl fermions. In Weyl semimetals, the conduction band and the valence band cross at a single point in reciprocal space called the Weyl point. Quasiparticles near this point can be described by the Weyl equation. The Weyl points have an intrinsic chirality and are topologically protected. On the exposed surface of Weyl semimetals, there exist exotic surface states which form an open segment (the Fermi arc) joining a pair of Weyl points with opposite chirality which are gapped in bulk. In this report, we show that the Fermi arc states give rise to unusual properties of surface plasmon dispersion, including non-reciprocality and broken time-reversal symmetry. As a result of the hybridization of conventional surface plasmon modes with collective modes associated to Fermi arc states, the Fermi arc plasmon (FAP) dispersion splits into three branches of solutions. At large wave vectors, the dispersion features open hyperbolic iso-frequency contours, which allows for tightly collimated beams of FAPs propagating in two specific directions with a broad bandwidth. This phenomenon may serve as a signature of Fermi arcs and can be used to detect and probe new Weyl semimetals. Furthermore, the intrinsic hyperbolic modes make Weyl semimetals promising candidates for high resolution subwavelength imaging with hyperlenses. Bachelor of Science in Physics 2018-04-29T13:21:44Z 2018-04-29T13:21:44Z 2018 Final Year Project (FYP) http://hdl.handle.net/10356/74135 en 35 p. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic DRNTU::Science::Physics::Atomic physics::Solid state physics
spellingShingle DRNTU::Science::Physics::Atomic physics::Solid state physics
Xiong, Ying
Theoretical study of fermi arc plasmons in Weyl semimetals
description Weyl semimetal is a type of crystals which host emergent quasiparticles that behave like Weyl fermions. In Weyl semimetals, the conduction band and the valence band cross at a single point in reciprocal space called the Weyl point. Quasiparticles near this point can be described by the Weyl equation. The Weyl points have an intrinsic chirality and are topologically protected. On the exposed surface of Weyl semimetals, there exist exotic surface states which form an open segment (the Fermi arc) joining a pair of Weyl points with opposite chirality which are gapped in bulk. In this report, we show that the Fermi arc states give rise to unusual properties of surface plasmon dispersion, including non-reciprocality and broken time-reversal symmetry. As a result of the hybridization of conventional surface plasmon modes with collective modes associated to Fermi arc states, the Fermi arc plasmon (FAP) dispersion splits into three branches of solutions. At large wave vectors, the dispersion features open hyperbolic iso-frequency contours, which allows for tightly collimated beams of FAPs propagating in two specific directions with a broad bandwidth. This phenomenon may serve as a signature of Fermi arcs and can be used to detect and probe new Weyl semimetals. Furthermore, the intrinsic hyperbolic modes make Weyl semimetals promising candidates for high resolution subwavelength imaging with hyperlenses.
author2 Chong Yidong
author_facet Chong Yidong
Xiong, Ying
format Final Year Project
author Xiong, Ying
author_sort Xiong, Ying
title Theoretical study of fermi arc plasmons in Weyl semimetals
title_short Theoretical study of fermi arc plasmons in Weyl semimetals
title_full Theoretical study of fermi arc plasmons in Weyl semimetals
title_fullStr Theoretical study of fermi arc plasmons in Weyl semimetals
title_full_unstemmed Theoretical study of fermi arc plasmons in Weyl semimetals
title_sort theoretical study of fermi arc plasmons in weyl semimetals
publishDate 2018
url http://hdl.handle.net/10356/74135
_version_ 1759857725487972352