Theory of activated transport in bilayer quantum Hall systems.
We analyze the transport properties of bilayer quantum Hall systems at total filling factor nu=1 in drag geometries as a function of interlayer bias, in the limit where the disorder is sufficiently strong to unbind meron-antimeron pairs, the charged topological defects of the system. We compute the...
| Huvudupphovsmän: | , , , |
|---|---|
| Materialtyp: | Journal article |
| Språk: | English |
| Publicerad: |
2008
|
| _version_ | 1826289174316056576 |
|---|---|
| author | Roostaei, B Mullen, K Fertig, H Simon, S |
| author_facet | Roostaei, B Mullen, K Fertig, H Simon, S |
| author_sort | Roostaei, B |
| collection | OXFORD |
| description | We analyze the transport properties of bilayer quantum Hall systems at total filling factor nu=1 in drag geometries as a function of interlayer bias, in the limit where the disorder is sufficiently strong to unbind meron-antimeron pairs, the charged topological defects of the system. We compute the typical energy barrier for these objects to cross incompressible regions within the disordered system using a Hartree-Fock approach, and show how this leads to multiple activation energies when the system is biased. We then demonstrate using a bosonic Chern-Simons theory that in drag geometries current in a single layer directly leads to forces on only two of the four types of merons, inducing dissipation only in the drive layer. Dissipation in the drag layer results from interactions among the merons, resulting in very different temperature dependences for the drag and drive layers, in qualitative agreement with experiment. |
| first_indexed | 2024-03-07T02:24:52Z |
| format | Journal article |
| id | oxford-uuid:a54109fe-5f03-4550-9ad5-9f8ebdd0ac10 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T02:24:52Z |
| publishDate | 2008 |
| record_format | dspace |
| spelling | oxford-uuid:a54109fe-5f03-4550-9ad5-9f8ebdd0ac102022-03-27T02:39:11ZTheory of activated transport in bilayer quantum Hall systems.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:a54109fe-5f03-4550-9ad5-9f8ebdd0ac10EnglishSymplectic Elements at Oxford2008Roostaei, BMullen, KFertig, HSimon, SWe analyze the transport properties of bilayer quantum Hall systems at total filling factor nu=1 in drag geometries as a function of interlayer bias, in the limit where the disorder is sufficiently strong to unbind meron-antimeron pairs, the charged topological defects of the system. We compute the typical energy barrier for these objects to cross incompressible regions within the disordered system using a Hartree-Fock approach, and show how this leads to multiple activation energies when the system is biased. We then demonstrate using a bosonic Chern-Simons theory that in drag geometries current in a single layer directly leads to forces on only two of the four types of merons, inducing dissipation only in the drive layer. Dissipation in the drag layer results from interactions among the merons, resulting in very different temperature dependences for the drag and drive layers, in qualitative agreement with experiment. |
| spellingShingle | Roostaei, B Mullen, K Fertig, H Simon, S Theory of activated transport in bilayer quantum Hall systems. |
| title | Theory of activated transport in bilayer quantum Hall systems. |
| title_full | Theory of activated transport in bilayer quantum Hall systems. |
| title_fullStr | Theory of activated transport in bilayer quantum Hall systems. |
| title_full_unstemmed | Theory of activated transport in bilayer quantum Hall systems. |
| title_short | Theory of activated transport in bilayer quantum Hall systems. |
| title_sort | theory of activated transport in bilayer quantum hall systems |
| work_keys_str_mv | AT roostaeib theoryofactivatedtransportinbilayerquantumhallsystems AT mullenk theoryofactivatedtransportinbilayerquantumhallsystems AT fertigh theoryofactivatedtransportinbilayerquantumhallsystems AT simons theoryofactivatedtransportinbilayerquantumhallsystems |