Polaritonic Feshbach Resonance

Abstract

A Feshbach resonance occurs when the energy of two interacting free particles comes to resonance with a molecular bound state. When approaching this resonance, dramatic changes in the interaction strength between the particles occur. Feshbach resonances have been an essential tool to control the atom interactions, which can even be switched from repulsive to attractive [1-4]. Thanks to Feshbach resonances many effects in ultracold atomic gases could be explored [5, 6]. Here we demonstrate a Feshbach resonance based on polariton spinor interactions that characterize the fundamental interaction process in polariton quantum systems. We show the clear enhancement of attractive interactions and the prompt change to repulsive interaction by tuning the energy of two polaritons with anti-parallel spins across the biexciton bound state energy. A mean field two-channel model quantitatively reproduces the experimental results. This observation paves the way for a new tool to tune the polariton interactions and to move forward into quantum correlated polariton physics.

supplementary material included. available at http://www.nature.com/nphys/journal/v10/n7/full/nphys2999.html

References in corpus (4)

• Many-Body Physics with Ultracold Gases
• Observation of Superfluidity of Polaritons in Semiconductor Microcavities
• Quantised Vortices in an Exciton-Polariton Fluid
• Tuning the scattering length with an optically induced Feshbach resonance

Cited by in corpus (14)

• Topological Photonics
• Exact steady state of a Kerr resonator with one- and two-photon driving and dissipation: Controllable Wigner-function multimodality and dissipative phase transitions
• Spontaneous spin bifurcations and ferromagnetic phase transitions in a spinor exciton-polariton condensate
• Multidimensional Coherent Spectroscopy of a Semiconductor Microcavity
• Spin-polarized lasing in a highly photoexcited semiconductor microcavity
• Hyperbolic Bloch equations: atom-cluster kinetics of an interacting Bose gas
• Controlling the optical spin Hall effect with light
• Coherent and incoherent aspects of polariton dynamics in semiconductor microcavities
• Many-body effects of a two-dimensional electron gas on trion-polaritons
• Excitation picture of an interacting Bose gas
• Spinor Stochastic Resonance
• Voltage control of the spin-dependent interaction constants of Dipolaritons and its application to Optical Parametric Oscillator
• Miscible-Immiscible Transition and Nonequilibrium Scaling in Two-Component Driven Open Condensate Wires
• Probing the collective excitations of a spinor polariton fluid