Ulf Gennser

TL;DR: The observation of intersubband electroluminescence from a p-type silicon/silicon-germanium quantum cascade structure is reported, and the nonradiative lifetime is found to depend strongly on the design of the quantum well structure, and is shown to reach values comparable to that of an equivalent GaInAs/AlInAs laser structure.

TL;DR: The quantitative measurement of the quantum-limited heat flow for Fermi particles across a single electronic channel is reported on, using noise thermometry, and demonstrated agreement with the predicted GQ establishes experimentally this basic building block of quantum thermal transport.

TL;DR: The results provide the first accurate determination of l_(phi) in the quantum Hall regime, which is the finite temperature coherence length of edge states in the integer quantum Hall effect regime.

TL;DR: In this article, a new spectroscopic technique for probing the flow of energy in the edge channels of a quantum Hall device finds no loss of energy to such extra edge states.

TL;DR: This work demonstrates the previously elusive ‘charge’ Kondo effect in a hybrid metal–semiconductor implementation of a single-electron transistor, with a quantum pseudospin of 1/2 constituted by two degenerate macroscopic charge states of a metallic island, and demonstrates quantitative agreement with the predictions for the finite-temperature crossover from quantum criticality.