Negative group delay of reflected Weyl quasiparticles
When an electron is incident from a Weyl material to an insulator and totally reflected, it suffers a reflection group delay and a reflection shift (Goos–Hänchen and/or Imbert–Fedorov shifts). We found the group delay is negative for half of the incident states. The negative group delay does not mea...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2021-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/ac3443 |
| _version_ | 1797750032082927616 |
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| author | Mou Yang Hai-Yan Li Rui-Qiang Wang |
| author_facet | Mou Yang Hai-Yan Li Rui-Qiang Wang |
| author_sort | Mou Yang |
| collection | DOAJ |
| description | When an electron is incident from a Weyl material to an insulator and totally reflected, it suffers a reflection group delay and a reflection shift (Goos–Hänchen and/or Imbert–Fedorov shifts). We found the group delay is negative for half of the incident states. The negative group delay does not mean the electron is bounced back before its injection, but is an effective acceleration of the electron near the interface induced by self-interference. The reflection shift orients circulating the points at which the surface-bulk state transition occurs. The reflection shift and the group delay cause velocity correction of the bound states in the Weyl material sandwiched by two insulators. The velocity correction features induced by the negative group delay were verified by a tight-binding calculation, in which the concept of group delay is not used. |
| first_indexed | 2024-03-12T16:27:56Z |
| format | Article |
| id | doaj.art-e133c11f6a1448a79c1f68a4de3ef6d8 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:27:56Z |
| publishDate | 2021-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-e133c11f6a1448a79c1f68a4de3ef6d82023-08-08T15:40:28ZengIOP PublishingNew Journal of Physics1367-26302021-01-01231111302410.1088/1367-2630/ac3443Negative group delay of reflected Weyl quasiparticlesMou Yang0https://orcid.org/0000-0002-3716-0652Hai-Yan Li1Rui-Qiang Wang2Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University , Guangzhou 510006, People’s Republic of ChinaGuangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University , Guangzhou 510006, People’s Republic of ChinaGuangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, School of Physics and Telecommunication Engineering, South China Normal University , Guangzhou 510006, People’s Republic of ChinaWhen an electron is incident from a Weyl material to an insulator and totally reflected, it suffers a reflection group delay and a reflection shift (Goos–Hänchen and/or Imbert–Fedorov shifts). We found the group delay is negative for half of the incident states. The negative group delay does not mean the electron is bounced back before its injection, but is an effective acceleration of the electron near the interface induced by self-interference. The reflection shift orients circulating the points at which the surface-bulk state transition occurs. The reflection shift and the group delay cause velocity correction of the bound states in the Weyl material sandwiched by two insulators. The velocity correction features induced by the negative group delay were verified by a tight-binding calculation, in which the concept of group delay is not used.https://doi.org/10.1088/1367-2630/ac3443Weyl semimetalquantum transportgroup delay |
| spellingShingle | Mou Yang Hai-Yan Li Rui-Qiang Wang Negative group delay of reflected Weyl quasiparticles New Journal of Physics Weyl semimetal quantum transport group delay |
| title | Negative group delay of reflected Weyl quasiparticles |
| title_full | Negative group delay of reflected Weyl quasiparticles |
| title_fullStr | Negative group delay of reflected Weyl quasiparticles |
| title_full_unstemmed | Negative group delay of reflected Weyl quasiparticles |
| title_short | Negative group delay of reflected Weyl quasiparticles |
| title_sort | negative group delay of reflected weyl quasiparticles |
| topic | Weyl semimetal quantum transport group delay |
| url | https://doi.org/10.1088/1367-2630/ac3443 |
| work_keys_str_mv | AT mouyang negativegroupdelayofreflectedweylquasiparticles AT haiyanli negativegroupdelayofreflectedweylquasiparticles AT ruiqiangwang negativegroupdelayofreflectedweylquasiparticles |