Controlled Coherent Coupling in a Quantum Dot Molecule Revealed by Ultrafast Four-Wave Mixing Spectroscopy

Abstract

Semiconductor quantum dot molecules are considered as promising candidates for quantum technological applications due to their wide tunability of optical properties and coverage of different energy scales associated with charge and spin physics. While previous works have studied the tunnel-coupling of the different excitonic charge complexes shared by the two quantum dots by conventional optical spectroscopy, we here report on the first demonstration of a coherently controlled inter-dot tunnel-coupling focusing on the quantum coherence of the optically active trion transitions. We employ ultrafast four-wave mixing spectroscopy to resonantly generate a quantum coherence in one trion complex, transfer it to and probe it in another trion configuration. With the help of theoretical modelling on different levels of complexity we give an instructive explanation of the underlying coupling mechanism and dynamical processes.

References in corpus (12)

• Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule
• Ultrafast optical control of entanglement between two quantum dot spins
• Importance of second-order piezoelectric effects in zincblende semiconductors
• Electrically tunable g-factors in quantum dot molecular spin states
• Deterministically Fabricated Solid-State Quantum-Light Sources
• Origin of non-linear piezoelectricity in III-V semiconductors: Internal strain and bond ionicity from hybrid-functional density functional theory
• Exciton lifetime and emission polarization dispersion in strongly in-plane asymmetric nanostructures
• Acoustic Phonon Sideband Dynamics During Polaron Formation in a Single Quantum Dot
• Quantum dot molecule devices with optical control of charge status and electronic control of coupling
• Coherent dynamics of a single Mn-doped quantum dot revealed by four-wave mixing spectroscopy
• Influence of local fields on the dynamics of four-wave mixing signals from 2D semiconductor systems
• Inter-band Coulomb coupling in narrow gap semiconductor nanocrystals: $\mathbf{k}\cdot \mathbf{p}$ theory

Cited by in corpus (2)

• Fundamentals of heterodyne wave mixing spectroscopy: a tutorial
• Layer-Dependent Spin Properties of Charge Carriers in Vertically Coupled Telecom Quantum Dots