Dispersive drumhead states in nodal-line semimetal junctions
We consider a smooth interface between a topological nodal-line semimetal and a topologically trivial insulator (e.g., the vacuum) or another semimetal with a nodal ring of different radius. Using a low-energy effective Hamiltonian including only the two crossing bands, we show that these junctions...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2024-02-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.6.013193 |
| _version_ | 1797210264483921920 |
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| author | Francesco Buccheri Reinhold Egger Alessandro De Martino |
| author_facet | Francesco Buccheri Reinhold Egger Alessandro De Martino |
| author_sort | Francesco Buccheri |
| collection | DOAJ |
| description | We consider a smooth interface between a topological nodal-line semimetal and a topologically trivial insulator (e.g., the vacuum) or another semimetal with a nodal ring of different radius. Using a low-energy effective Hamiltonian including only the two crossing bands, we show that these junctions accommodate a two-dimensional zero-energy level and a set of two-dimensional dispersive bands, corresponding to states localized at the interface. We characterize the spectrum, identifying the parameter ranges in which these states are present, and highlight the role of the nodal radius and the smoothness of the interface. We also suggest material-independent ways to detect and identify these states, using optical conductivity and infrared absorption spectroscopy in magnetic field. |
| first_indexed | 2024-04-24T10:07:50Z |
| format | Article |
| id | doaj.art-cdf3db7a435b4e5d9fb2329eb2fc69d6 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:07:50Z |
| publishDate | 2024-02-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-cdf3db7a435b4e5d9fb2329eb2fc69d62024-04-12T17:39:26ZengAmerican Physical SocietyPhysical Review Research2643-15642024-02-016101319310.1103/PhysRevResearch.6.013193Dispersive drumhead states in nodal-line semimetal junctionsFrancesco BuccheriReinhold EggerAlessandro De MartinoWe consider a smooth interface between a topological nodal-line semimetal and a topologically trivial insulator (e.g., the vacuum) or another semimetal with a nodal ring of different radius. Using a low-energy effective Hamiltonian including only the two crossing bands, we show that these junctions accommodate a two-dimensional zero-energy level and a set of two-dimensional dispersive bands, corresponding to states localized at the interface. We characterize the spectrum, identifying the parameter ranges in which these states are present, and highlight the role of the nodal radius and the smoothness of the interface. We also suggest material-independent ways to detect and identify these states, using optical conductivity and infrared absorption spectroscopy in magnetic field.http://doi.org/10.1103/PhysRevResearch.6.013193 |
| spellingShingle | Francesco Buccheri Reinhold Egger Alessandro De Martino Dispersive drumhead states in nodal-line semimetal junctions Physical Review Research |
| title | Dispersive drumhead states in nodal-line semimetal junctions |
| title_full | Dispersive drumhead states in nodal-line semimetal junctions |
| title_fullStr | Dispersive drumhead states in nodal-line semimetal junctions |
| title_full_unstemmed | Dispersive drumhead states in nodal-line semimetal junctions |
| title_short | Dispersive drumhead states in nodal-line semimetal junctions |
| title_sort | dispersive drumhead states in nodal line semimetal junctions |
| url | http://doi.org/10.1103/PhysRevResearch.6.013193 |
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