Real-time detection of single-electron tunneling using a quantum point contact

Detection of Majorana Kramers Pairs Using a Quantum Point Contact.

We propose a setup that integrates a quantum point contact (QPC) and a Josephson junction on a quantum spin Hall sample, experimentally realizable in InAs/GaSb quantum wells. The confinement due to both the QPC and the superconductor results in a Kramers pair of Majorana zero-energy bound states when the superconducting phases in the two arms differ by an odd multiple of π across the Josephson ...

Transistors – From Point Contact to Single Electron

The first solid state electron device was the metal-semiconductor rectifier discovered by Ferdinand Braun in 1874 even before the discovery of the electron! He found that mercury metal contacts on copper or iron sulphide gave non-linear currentvoltage characteristics. In 1904 J C Bose obtained a U.S patent for point contact rectifiers on Galena (PbS). He found that the direction of rectificatio...

On Quantum Tunneling in Real Time

A detailed real time description of quantum tunneling in the semiclassical limit is given, using complex classical trajectories. This picture connects naturally with the ideas of post-selection and weak measurement introduced by Aharonov and collaborators. I show that one can precisely identify the complex classical trajectory which a post-selected tunneling particle has followed, and which dom...

Detection of Congenital Mullerian Anomalies Using Real-Time 3D Sonography

Resonant multilead point-contact tunneling

We analyze a model of resonant point-contact tunneling between multiple Luttinger-liquid leads. The model is a variant of the multichannel Kondo model and can be related to the quantum Brownian motion of a particle on lattices with p flux through each plaquette ~in the three-lead case, it is a honeycomb lattice with p flux!. By comparing the perturbative and instanton gas expansions, we find a ...