Engineering and Manipulating Exciton Wave Packets

Abstract

When a semiconductor absorbs light, the resulting electron-hole superposition amounts to a uncontrolled quantum ripple that eventually degenerates into diffusion. If the conformation of these excitonic superpositions could be engineered, though, they would constitute a new means of transporting information and energy. We show that properly designed laser pulses can be used to create such excitonic wave packets. They can be formed with a prescribed speed, direction and spectral make-up that allows them to be selectively passed, rejected or even dissociated using superlattices. Their coherence also provides a handle for manipulation using active, external controls. Energy and information can be conveniently processed and subsequently removed at a distant site by reversing the original procedure to produce a stimulated emission. The ability to create, manage and remove structured excitons comprises the foundation for opto-excitonic circuits with application to a wide range of quantum information, energy and light-flow technologies. The paradigm is demonstrated using both Tight-Binding and Time-Domain Density Functional Theory simulations.

16 figures

References in corpus (20)

• Dephasing assisted transport: Quantum networks and biomolecules
• Real-space grids and the Octopus code as tools for the development of new simulation approaches for electronic systems
• Quantum Communication through Spin Chain Dynamics: an Introductory Overview
• The Propagation of Quantum Information Through a Spin System
• Long-Lived Electronic Coherence in Dissipative Exciton-Dynamics of Light-Harvesting Complexes
• Designing Frustrated Quantum Magnets with Laser-Dressed Rydberg Atoms
• High-performance solution of hierarchical equations of motions for studying energy-transfer in light-harvesting complexes
• Microscopy of a scalable superatom
• Drift mobility of long-living excitons in coupled GaAs quantum wells
• Photon mediated interaction between distant quantum dot circuits
• Correlated Exciton Transport in Rydberg-Dressed-Atom Spin Chains
• Quantum speed limits for leakage and decoherence
• High-dimensional quantum state transfer through a quantum spin chain
• Adiabatic many-body state preparation and information transfer in quantum dot arrays
• Quantum Logic between Remote Quantum Registers
• Practicality of spin chain 'wiring' in diamond quantum technologies
• Time Independent Universal Computing with Spin Chains: Quantum Plinko Machine
• Designing Small Silicon Quantum Dots with Low Reorganization Energy
• Control of Exciton Transport using Quantum Interference
• Time independent quantum circuits with local interactions

Cited by in corpus (5)

• One-dimensional many-body entangled open quantum systems with tensor network methods
• Zitterbewegung of moiré excitons in twisted MoS${}_2$/WSe${}_2$ hetero-bilayers
• Scattering of a dark-bright soliton by an impurity
• Angular momentum transport with twisted exciton wave packets
• Identification and Resolution of Unphysical Multielectron Excitations in the Real-Time Time-Dependent Kohn-Sham Formulation