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Diamagnetism of microcavity polaritons induced by spin-dependent polariton–polariton interactions

Authors
Journal
Physics Letters A
0375-9601
Publisher
Elsevier
Publication Date
Volume
376
Issue
45
Identifiers
DOI: 10.1016/j.physleta.2012.08.042
Keywords
  • Condensed Matter
Disciplines
  • Physics

Abstract

Abstract Diamagnetism of condensed microcavity polaritons in a vertically applied magnetic field is theoretically studied by using the density of free energy of polaritons. The magnetic dependence of polariton–polariton interactions and spin polarization degree of polaritons are derived, and are used to show the diamagnetic behavior of the polariton spin polarization, which is discussed for GaAs-based microcavities. We show that for strong magnetic field the spin polarization of the polaritons is paramagnetic as usual, while around positive exciton–photon detuning and special Rabi splitting, the spin polarization of the polaritons could be diamagnetic. In addition, weak magnetic field and high polariton density are beneficial to observe the polariton diamagnetism.

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