Spin textures, screening and excitations in dirty quantum Hall ferromagnets
We study quantum Hall ferromagnets in the presence of a random electrostatic impurity potential. Describing these systems with a classical non-linear sigma model and using analytical estimates supported by results from numerical simulations, we examine the nature of the ground state as a function of...
| Main Authors: | , , |
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| Format: | Journal article |
| Language: | English |
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2001
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| _version_ | 1826303704925470720 |
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| author | Rapsch, S Chalker, J Lee, D |
| author_facet | Rapsch, S Chalker, J Lee, D |
| author_sort | Rapsch, S |
| collection | OXFORD |
| description | We study quantum Hall ferromagnets in the presence of a random electrostatic impurity potential. Describing these systems with a classical non-linear sigma model and using analytical estimates supported by results from numerical simulations, we examine the nature of the ground state as a function of disorder strength, $\Delta$, and deviation, $\delta \nu$, of the average Landau level filling factor from unity. Screening of an impurity potential requires distortions of the spin configuration, and in the absence of Zeeman coupling there is a disorder-driven, zero-temperature phase transition from a ferromagnet at small $\Delta$ and $|\delta \nu|$ to a spin glass at larger $\Delta$ or $|\delta \nu|$. We examine ground-state response functions and excitations. |
| first_indexed | 2024-03-07T06:06:46Z |
| format | Journal article |
| id | oxford-uuid:ee1eb1f7-5113-40e5-b608-c6e3add8f15f |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T06:06:46Z |
| publishDate | 2001 |
| record_format | dspace |
| spelling | oxford-uuid:ee1eb1f7-5113-40e5-b608-c6e3add8f15f2022-03-27T11:30:19ZSpin textures, screening and excitations in dirty quantum Hall ferromagnetsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ee1eb1f7-5113-40e5-b608-c6e3add8f15fEnglishSymplectic Elements at Oxford2001Rapsch, SChalker, JLee, DWe study quantum Hall ferromagnets in the presence of a random electrostatic impurity potential. Describing these systems with a classical non-linear sigma model and using analytical estimates supported by results from numerical simulations, we examine the nature of the ground state as a function of disorder strength, $\Delta$, and deviation, $\delta \nu$, of the average Landau level filling factor from unity. Screening of an impurity potential requires distortions of the spin configuration, and in the absence of Zeeman coupling there is a disorder-driven, zero-temperature phase transition from a ferromagnet at small $\Delta$ and $|\delta \nu|$ to a spin glass at larger $\Delta$ or $|\delta \nu|$. We examine ground-state response functions and excitations. |
| spellingShingle | Rapsch, S Chalker, J Lee, D Spin textures, screening and excitations in dirty quantum Hall ferromagnets |
| title | Spin textures, screening and excitations in dirty quantum Hall
ferromagnets |
| title_full | Spin textures, screening and excitations in dirty quantum Hall
ferromagnets |
| title_fullStr | Spin textures, screening and excitations in dirty quantum Hall
ferromagnets |
| title_full_unstemmed | Spin textures, screening and excitations in dirty quantum Hall
ferromagnets |
| title_short | Spin textures, screening and excitations in dirty quantum Hall
ferromagnets |
| title_sort | spin textures screening and excitations in dirty quantum hall ferromagnets |
| work_keys_str_mv | AT rapschs spintexturesscreeningandexcitationsindirtyquantumhallferromagnets AT chalkerj spintexturesscreeningandexcitationsindirtyquantumhallferromagnets AT leed spintexturesscreeningandexcitationsindirtyquantumhallferromagnets |