Influence of magnetic quantum confined Stark effect on the spin lifetime of indirect excitons

Abstract

We report on the unusual and counter-intuitive behaviour of spin lifetime of excitons in coupled semiconductor quantum wells (CQWs) in the presence of in-plane magnetic field. Instead of conventional acceleration of spin relaxation due to the Larmor precession of electron and hole spins we observe a strong increase of the spin relaxation time at low magnetic fields followed by saturation and decrease at higher fields. We argue that this non-monotonic spin relaxation dynamics is a fingerprint of the magnetic quantum confined Stark effect. In the presence of electric field along the CQW growth axis, an applied magnetic field efficiently suppresses the exciton spin coherence, due to inhomogeneous broadening of the $g$-factor distribution.

9 pages, 4 figures

References in corpus (4)

• Spin coherence of a two-dimensional electron gas induced by resonant excitation of trions and excitons in CdTe/(Cd,Mg)Te quantum wells
• Spin transfer and coherence in coupled quantum wells
• Nonlinear optical spectroscopy of indirect excitons in biased coupled quantum wells
• Coherent transport and manipulation of spins in indirect exciton nanostructures

Cited by in corpus (4)

• Anomalous Exciton Hall Effect
• Transition from spin-orbit to hyperfine dominated spin relaxation in a cold fluid of dipolar excitons
• Tunable effective masses of magneto-excitons in two-dimensional materials
• Overflow of a dipolar exciton trap at high magnetic fields