Coherent probing of excited quantum dot states in an interferometer

Abstract

Measurements of elastic and inelastic cotunneling currents are presented on a two-terminal Aharonov--Bohm interferometer with a Coulomb blockaded quantum dot embedded in each arm. Coherent current contributions, even in magnetic field, are found in the nonlinear regime of inelastic cotunneling at finite bias voltage. The phase of the Aharonov--Bohm oscillations in the current exhibits phase jumps of $\pi$ at the onsets of inelastic processes. We suggest that additional coherent elastic processes occur via the excited state. Our measurement technique allows the detection of such processes on a background of other inelastic current contributions and contains information about the excited state occupation probability and the inelastic relaxation rates.

References in corpus (3)

• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Magnetic field dependent transmission phase of a double dot system in a quantum ring
• Combined atomic force microscope and electron-beam lithography used for the fabrication of variable-coupling quantum dots

Cited by in corpus (8)

• Electron counting in quantum dots
• Waiting time distributions of electron transfers through quantum dot Aharonov-Bohm interferometers
• Quantum interference and spin polarization on Rashba double quantum dots
• Sagnac interference in Carbon nanotube loops
• Coherent switching by detuning a side-coupled quantum-dot system
• Sagnac interference in Carbon nanotubes
• Time-dependent magnetotransport of a wave packet in a quantum wire with embedded quantum dots
• Phase switching in a voltage-biased Aharonov-Bohm interferometer