Fluctuation-induced giant magnetoresistance in charge-neutral graphene
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866917358840315904 |
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| author | Levchenko, A. Kirkinis, E. Andreev, A. V. |
| author_facet | Levchenko, A. Kirkinis, E. Andreev, A. V. |
| contents | The Johnson-Nyquist noise associated with the intrinsic conductivity of the electron liquid, induces fluctuations of the electron density in charge-neutral graphene devices. In the presence of external electric and magnetic fields, the fluctuations of charge density and electric current induce a fluctuating hydrodynamic flow. We show that the resulting advection of charge produces a fluctuation contribution to the macroscopic conductivity of the system, $σ_{\mathrm{fl}}$, and develop a quantitative theory of $σ_{\mathrm{fl}}$. At zero magnetic field, $σ_{\mathrm{fl}}$ diverges logarithmically with the system size and becomes rapidly suppressed at relatively small fields. This results in giant magnetoresistance of the system. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_09988 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fluctuation-induced giant magnetoresistance in charge-neutral graphene Levchenko, A. Kirkinis, E. Andreev, A. V. Mesoscale and Nanoscale Physics Fluid Dynamics The Johnson-Nyquist noise associated with the intrinsic conductivity of the electron liquid, induces fluctuations of the electron density in charge-neutral graphene devices. In the presence of external electric and magnetic fields, the fluctuations of charge density and electric current induce a fluctuating hydrodynamic flow. We show that the resulting advection of charge produces a fluctuation contribution to the macroscopic conductivity of the system, $σ_{\mathrm{fl}}$, and develop a quantitative theory of $σ_{\mathrm{fl}}$. At zero magnetic field, $σ_{\mathrm{fl}}$ diverges logarithmically with the system size and becomes rapidly suppressed at relatively small fields. This results in giant magnetoresistance of the system. |
| title | Fluctuation-induced giant magnetoresistance in charge-neutral graphene |
| topic | Mesoscale and Nanoscale Physics Fluid Dynamics |
| url | https://arxiv.org/abs/2512.09988 |