Probing the dark exciton states of a single quantum dot using photocurrent spectroscopy in magnetic fields

Abstract

We report on high-resolution photoluminescence (PL) and photocurrent (PC) spectroscopies of a single self-assembled InAs/GaAs quantum dot (QD) embedded in an n-i-Schottky device with an applied magnetic field in Faraday and Voigt geometries. The single-QD PC spectrum of neutral exciton (X${}^0$) is obtained by sweeping the bias-dependent X${}^0$ transition energy to achieve resonance with a fixed narrow-bandwidth laser through quantum-confined Stark effect. With a magnetic field applied in Faraday geometry, the diamagnetic effect and the Zeeman splitting of X${}^0$ are observed both in PL and PC spectra. When the magnetic field is applied in Voigt geometry, the mixture of bright and dark states results in an observation of dark exciton states, which are confirmed by the polarization-resolved PL and PC spectra.

13 pages, 4 figures

References in corpus (6)

• Magnetic-field-induced reduction of the exciton polarization splitting in InAs quantum dots
• Fast optical preparation, control and read-out of single quantum dot spin
• Electrically tunable g-factors in quantum dot molecular spin states
• Determinisitic Writing and Control of the Dark Exciton Spin using Short Single Optical Pulses
• Atomistic theory of dark excitons in self-assembled quantum dots of reduced symmetry
• Charge state control in single InAs/GaAs quantum dots by external electric and magnetic fields

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• Giant Photocurrent Enhancement by Coulomb Interaction in a Single Quantum Dot for Energy Harvesting
• Tuning the carrier tunneling in a single quantum dot with a magnetic field in Faraday geometry
• Asymmetric Chiral Coupling in a Topological Resonator