Robust ground state and artificial gauge in DQW exciton condensates under weak magnetic field

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dc.citation.epage14en_US
dc.citation.spage10en_US
dc.citation.volumeNumber62en_US
dc.contributor.authorHakioǧlu, Tuğrulen_US
dc.contributor.authorÖzgün, Egeen_US
dc.contributor.authorGünay, Mehmeten_US
dc.date.accessioned2016-02-08T11:01:45Z
dc.date.available2016-02-08T11:01:45Z
dc.date.issued2014en_US
dc.departmentDepartment of Physicsen_US
dc.description.abstractAn exciton condensate is a vast playground in studying a number of symmetries that are of high interest in the recent developments in topological condensed matter physics. In double quantum wells (DQWs) they pose highly nonconventional properties due to the pairing of non-identical fermions with a spin dependent order parameter. Here, we demonstrate a new feature in these systems: the robustness of the ground state to weak external magnetic field and the appearance of the artificial spinor gauge fields beyond a critical field strength where negative energy pair-breaking quasi particle excitations, i.e. de-excitation pockets (DX-pockets), are created in certain k regions. The DX-pockets are the Kramers symmetry broken analogs of the negative energy pockets examined in the 1960s by Sarma. They respect a disk or a shell-topology in k-space or a mixture between them depending on the magnetic field strength and the electron-hole density mismatch. The Berry connection between the artificial spinor gauge field and the TKNN number is made. This field describes a collection of pure spin vortices in real space when the magnetic field has only inplane components.en_US
dc.identifier.doi10.1016/j.physe.2014.01.025en_US
dc.identifier.eissn1873-1759
dc.identifier.issn1873-1759
dc.identifier.urihttp://hdl.handle.net/11693/26573
dc.language.isoEnglishen_US
dc.publisherElsevier B.V.en_US
dc.relation.isversionofhttp://dx.doi.org/10.1016/j.physe.2014.01.025en_US
dc.source.titlePhysica E : Low-Dimensional Systems and Nanostructuresen_US
dc.subjectDouble quantum wellen_US
dc.subjectExciton condensationen_US
dc.subjectSemiconductoren_US
dc.titleRobust ground state and artificial gauge in DQW exciton condensates under weak magnetic fielden_US
dc.typeArticleen_US
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