Persistent current distributions along a p-n junction in graphene in a magnetic field
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arXiv
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866912102837387264 |
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| author | Shizuya, K. |
| author_facet | Shizuya, K. |
| contents | A p-n junction, induced in graphene by gating, works to contrast the edge states of electrons and holes on each side of it. In a magnetic field those edge states carry two species of persistent current, which are intimately tied to the edge-mode spectra. We study how those persistent currents change along each side of the junction as the Fermi level is varied, with special emphasis on the electron-hole conjugation property of the Dirac electrons. A close look is made into the electromagnetic response of the valence band filled with negative-energy electrons, or the Dirac sea, which as a whole turns out to be electrically inactive while showing intrinsic orbital diamagnetism. Recently, in experiment, it became possible to observe local currents in planar samples by use of a nanoscale magnetometer. The p-n junctions in graphene and related atomic layers, via detection of associated microscopic currents, will be a useful platform for exploring many-body quantum phenomena. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_01367 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Persistent current distributions along a p-n junction in graphene in a magnetic field Shizuya, K. Mesoscale and Nanoscale Physics A p-n junction, induced in graphene by gating, works to contrast the edge states of electrons and holes on each side of it. In a magnetic field those edge states carry two species of persistent current, which are intimately tied to the edge-mode spectra. We study how those persistent currents change along each side of the junction as the Fermi level is varied, with special emphasis on the electron-hole conjugation property of the Dirac electrons. A close look is made into the electromagnetic response of the valence band filled with negative-energy electrons, or the Dirac sea, which as a whole turns out to be electrically inactive while showing intrinsic orbital diamagnetism. Recently, in experiment, it became possible to observe local currents in planar samples by use of a nanoscale magnetometer. The p-n junctions in graphene and related atomic layers, via detection of associated microscopic currents, will be a useful platform for exploring many-body quantum phenomena. |
| title | Persistent current distributions along a p-n junction in graphene in a magnetic field |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2411.01367 |