Measurement and control of electron wave packets from a single-electron source

Abstract

We report an experimental technique to measure and manipulate the arrival-time and energy distributions of electrons emitted from a semiconductor electron pump, operated as both a single-electron source and a two-electron source. Using an energy-selective detector whose transmission we control on picosecond timescales, we can measure directly the electron arrival-time distribution and we determine the upper-bound to the distribution width to be 30 ps. We study the effects of modifying the shape of the voltage waveform that drives the electron pump, and show that our results can be explained by a tunneling model of the emission mechanism. This information was in turn used to control the emission-time difference and energy gap between a pair of electrons.

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• LO-phonon emission rate of hot electrons from an on-demand single-electron source in a GaAs/AlGaAs heterostructure
• Half-levitons -- zero-energy excitations of a driven Fermi sea
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• A tunable electronic beam splitter realized with crossed graphene nanoribbons
• Photoexcitation of electron wave packets in quantum spin Hall edge states: effects of chiral anomaly from a localised electric pulse
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• Two-particle interferometry in quantum Hall edge channels
• Single-electron coherence: finite temperature versus pure dephasing
• Phonon emission and arrival times of electrons from a single-electron source
• Trapping and counting ballistic non-equilibrium electrons
• Relaxation of quantum dots in a magnetic field at finite bias -- charge, spin and heat currents
• Energy relaxation in hot electron quantum optics via acoustic and optical phonon emission
• The Interacting Mesoscopic Capacitor Out of Equilibrium
• Classical-to-quantum crossover in electron on-demand emission
• Time-energy filtering of single electrons in ballistic waveguides
• Composite two-particle sources
• Multi-particle interference in an electronic Mach-Zehnder interferometer
• High-temperature fusion of a multi-electron leviton
• Interplay between Rashba interaction and electromagnetic field in the edge states of a 2D topological insulator
• Phase-Coherent Dynamics of Quantum Devices With Local Interactions
• Protocol for Fermionic Positive-Operator-Valued Measures
• Photoexcitation in two-dimensional topological insulators: Generating and controlling electron wavepackets in Quantum Spin Hall systems
• Non-adiabatic single-electron pump in a dopant-free GaAs/AlGaAs 2DEG
• Collision of two interacting electrons on a mesoscopic beamsplitter: exact solution in the classical limit
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• Spectroscopy of hot-electron pair emission from a driven quantum dot
• Single electron routing in a silicon quantum-dot array
• Floquet-Nambu theory of electron quantum optics with superconductors
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• Asymmetric arms maximise visibility in hot-electron interferometers
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• Method for rapid estimation of the energy-time covariance matrix of single electrons