Valley-selective Landau-Zener oscillations in semi-Dirac p − n junctions
We study transport across p-n junctions of gapped two-dimensional semi-Dirac materials: nodal semimetals whose energy bands disperse quadratically and linearly along distinct crystal axes. The resulting electronic properties - relevant to materials such as TiO2/VO2 multilayers and α-(BEDT-TTF)2I3 sa...
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| Format: | Journal article |
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American Physical Society
2017
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| _version_ | 1797093765393940480 |
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| author | Saha, K Nandkishore, R Parameswaran, S |
| author_facet | Saha, K Nandkishore, R Parameswaran, S |
| author_sort | Saha, K |
| collection | OXFORD |
| description | We study transport across p-n junctions of gapped two-dimensional semi-Dirac materials: nodal semimetals whose energy bands disperse quadratically and linearly along distinct crystal axes. The resulting electronic properties - relevant to materials such as TiO2/VO2 multilayers and α-(BEDT-TTF)2I3 salts - continuously interpolate between those of mono- and bilayer graphene as a function of propagation angle. We demonstrate that tunneling across the junction depends on the orientation of the tunnel barrier relative to the crystalline axes, leading to strongly nonmonotonic current-voltage characteristics, including negative differential conductance in some regimes. In multivalley systems, these features provide a natural route to engineering valley-selective transport. |
| first_indexed | 2024-03-07T04:04:58Z |
| format | Journal article |
| id | oxford-uuid:c5d5006e-a2c8-4100-82f6-6f09ca15af6e |
| institution | University of Oxford |
| last_indexed | 2024-03-07T04:04:58Z |
| publishDate | 2017 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:c5d5006e-a2c8-4100-82f6-6f09ca15af6e2022-03-27T06:33:56ZValley-selective Landau-Zener oscillations in semi-Dirac p − n junctionsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c5d5006e-a2c8-4100-82f6-6f09ca15af6eSymplectic Elements at OxfordAmerican Physical Society2017Saha, KNandkishore, RParameswaran, SWe study transport across p-n junctions of gapped two-dimensional semi-Dirac materials: nodal semimetals whose energy bands disperse quadratically and linearly along distinct crystal axes. The resulting electronic properties - relevant to materials such as TiO2/VO2 multilayers and α-(BEDT-TTF)2I3 salts - continuously interpolate between those of mono- and bilayer graphene as a function of propagation angle. We demonstrate that tunneling across the junction depends on the orientation of the tunnel barrier relative to the crystalline axes, leading to strongly nonmonotonic current-voltage characteristics, including negative differential conductance in some regimes. In multivalley systems, these features provide a natural route to engineering valley-selective transport. |
| spellingShingle | Saha, K Nandkishore, R Parameswaran, S Valley-selective Landau-Zener oscillations in semi-Dirac p − n junctions |
| title | Valley-selective Landau-Zener oscillations in semi-Dirac p − n junctions |
| title_full | Valley-selective Landau-Zener oscillations in semi-Dirac p − n junctions |
| title_fullStr | Valley-selective Landau-Zener oscillations in semi-Dirac p − n junctions |
| title_full_unstemmed | Valley-selective Landau-Zener oscillations in semi-Dirac p − n junctions |
| title_short | Valley-selective Landau-Zener oscillations in semi-Dirac p − n junctions |
| title_sort | valley selective landau zener oscillations in semi dirac p n junctions |
| work_keys_str_mv | AT sahak valleyselectivelandauzeneroscillationsinsemidiracpnjunctions AT nandkishorer valleyselectivelandauzeneroscillationsinsemidiracpnjunctions AT parameswarans valleyselectivelandauzeneroscillationsinsemidiracpnjunctions |