Equilibration of integer quantum Hall edge states
We study equilibration of quantum Hall edge states at integer filling factors, motivated by experiments involving point contacts at finite bias. Idealising the experimental situation and extending the notion of a quantum quench, we consider time evolution from an initial non-equilibrium state in a t...
| Main Authors: | , |
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| Formato: | Journal article |
| Idioma: | English |
| Publicado em: |
2010
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| _version_ | 1826267660997885952 |
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| author | Kovrizhin, D Chalker, J |
| author_facet | Kovrizhin, D Chalker, J |
| author_sort | Kovrizhin, D |
| collection | OXFORD |
| description | We study equilibration of quantum Hall edge states at integer filling factors, motivated by experiments involving point contacts at finite bias. Idealising the experimental situation and extending the notion of a quantum quench, we consider time evolution from an initial non-equilibrium state in a translationally invariant system. We show that electron interactions bring the system into a steady state at long times. Strikingly, this state is not a thermal one: its properties depend on the full functional form of the initial electron distribution, and not simply on the initial energy density. Further, we demonstrate that measurements of the tunneling density of states at long times can yield either an over-estimate or an under-estimate of the energy density, depending on details of the analysis, and discuss this finding in connection with an apparent energy loss observed experimentally. More specifically, we treat several separate cases: for filling factor \nu=1 we discuss relaxation due to finite-range or Coulomb interactions between electrons in the same channel, and for filling factor \nu=2 we examine relaxation due to contact interactions between electrons in different channels. In both instances we calculate analytically the long-time asymptotics of the single-particle correlation function. These results are supported by an exact solution at arbitrary time for the problem of relaxation at \nu=2 from an initial state in which the two channels have electron distributions that are both thermal but with unequal temperatures, for which we also examine the tunneling density of states. |
| first_indexed | 2024-03-06T20:57:35Z |
| format | Journal article |
| id | oxford-uuid:39c7dcc1-029e-4d83-bb3a-cc876a28ea9d |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:57:35Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | oxford-uuid:39c7dcc1-029e-4d83-bb3a-cc876a28ea9d2022-03-26T13:57:35ZEquilibration of integer quantum Hall edge statesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:39c7dcc1-029e-4d83-bb3a-cc876a28ea9dEnglishSymplectic Elements at Oxford2010Kovrizhin, DChalker, JWe study equilibration of quantum Hall edge states at integer filling factors, motivated by experiments involving point contacts at finite bias. Idealising the experimental situation and extending the notion of a quantum quench, we consider time evolution from an initial non-equilibrium state in a translationally invariant system. We show that electron interactions bring the system into a steady state at long times. Strikingly, this state is not a thermal one: its properties depend on the full functional form of the initial electron distribution, and not simply on the initial energy density. Further, we demonstrate that measurements of the tunneling density of states at long times can yield either an over-estimate or an under-estimate of the energy density, depending on details of the analysis, and discuss this finding in connection with an apparent energy loss observed experimentally. More specifically, we treat several separate cases: for filling factor \nu=1 we discuss relaxation due to finite-range or Coulomb interactions between electrons in the same channel, and for filling factor \nu=2 we examine relaxation due to contact interactions between electrons in different channels. In both instances we calculate analytically the long-time asymptotics of the single-particle correlation function. These results are supported by an exact solution at arbitrary time for the problem of relaxation at \nu=2 from an initial state in which the two channels have electron distributions that are both thermal but with unequal temperatures, for which we also examine the tunneling density of states. |
| spellingShingle | Kovrizhin, D Chalker, J Equilibration of integer quantum Hall edge states |
| title | Equilibration of integer quantum Hall edge states |
| title_full | Equilibration of integer quantum Hall edge states |
| title_fullStr | Equilibration of integer quantum Hall edge states |
| title_full_unstemmed | Equilibration of integer quantum Hall edge states |
| title_short | Equilibration of integer quantum Hall edge states |
| title_sort | equilibration of integer quantum hall edge states |
| work_keys_str_mv | AT kovrizhind equilibrationofintegerquantumhalledgestates AT chalkerj equilibrationofintegerquantumhalledgestates |