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

T. Hakioǧlu*, Ege Özgün, Mehmet Günay

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


An 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.

Original languageEnglish
Pages (from-to)10-14
Number of pages5
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Publication statusPublished - Aug 2014
Externally publishedYes


  • Double quantum well
  • Exciton condensation
  • Semiconductor


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