Effect of magnetic field on intersubband polaritons in a quantum well: Strong to weak coupling conversion

TL;DR

This paper theoretically explores how a magnetic field influences intersubband polaritons in an asymmetric quantum well, demonstrating a transition from strong to weak coupling regimes, enabling magnetic control of polaritonic devices.

Contribution

It introduces a theoretical model showing magnetic field-induced switching of polariton coupling regimes in quantum wells, a novel method for controlling polaritonic systems.

Findings

Magnetic field causes diamagnetic shift of electron subbands.

Increased broadening of optical lines under magnetic field.

Magnetic field can switch polariton coupling from strong to weak.

Abstract

We investigate theoretically the effect of a magnetic field on intersubband polaritons in an asymmetric quantum well placed inside an optical resonator. It is demonstrated that the field-induced diamagnetic shift of electron subbands in the well increases the broadening of optical lines corresponding to intersubband electron transitions. As a consequence, the magnetic field can switch the polariton system from the regime of strong light-matter coupling to the regime of weak one. This effect paves a way to the effective control of polaritonic devices with a magnetic field.