Control of the transmission phase in an asymmetric four-terminal Aharonov-Bohm interferometer

Abstract

Phase sensitivity and thermal dephasing in coherent electron transport in quasi one-dimensional (1D) waveguide rings of an asymmetric four-terminal geometry are studied by magnetotransport measurements. We demonstrate the electrostatic control of the phase in Aharonov-Bohm (AB) resistance oscillations and investigate the impact of the measurement circuitry on decoherence. Phase rigidity is broken due to the ring geometry: Orthogonal waveguide cross-junctions and 1D leads minimize reflections and resonances between leads allowing for a continuous electron transmission phase shift. The measurement circuitry influences dephasing: Thermal averaging dominates in the non-local measurement configuration while additional influence of potential fluctuations becomes relevant in the local configuration.

7 pages, 4 figures

References in corpus (4)

• Magnetic field dependent transmission phase of a double dot system in a quantum ring
• Transmission phase of a singly occupied quantum dot in the Kondo regime
• Universality of Bias- and Temperature-induced Dephasing in Ballistic Electronic Interferometers
• An efficient and accurate method to obtain the energy-dependent Green function for general potentials

Cited by in corpus (11)

• Magnetic-field influenced non-equilibrium transport through a quantum ring with correlated electrons in a photon cavity
• Phase shifts and phase $\pi$-jumps in four-terminal waveguide Aharonov-Bohm interferometers
• Measurement of the Transmission Phase of an Electron in a Quantum Two-Path Interferometer
• Geometry and linearly polarized cavity photon effects on the charge and spin currents of spin-orbit interacting electrons in a quantum ring
• Noise thermometry in narrow 2D electron gas heat baths connected to a quasi-1D interferometer
• Non-Reciprocity of the Wave Packet Scattering Delay in Ballistic Two-Terminal Devices
• Thermal junctions controlled with Aharonov-Bohm phases
• Phase extraction in disordered isospectral shapes
• Mode-filtered electron injection into a waveguide interferometer
• Field effect induced mesoscopic devices in depleted two dimensional electron systems
• Geometric reduction of dynamical nonlocality in nanoscale quantum circuits