This PhD project is part of a National Centre of Competence in Research (NCCR), named “Spin”, recently selected by the Swiss NSF. This long-term project aims to advance semiconductor-based spin-qubits to a level where quantum-error correction can be demonstrated. It
In this new publication, entitled: Highly symmetric and tunable tunnel couplings in InAs/InP nanowire heterostructure quantum dots Frederick and co-worker show that built-in quantum dots (QD) are very versatile for high resolution tunneling spectroscopy, since the tunnel coupling strength G1 and G2 can be
Lujun succeessfully defended his thesis on Tuesday Jan. 7th. Congratulations! Happy Lujun. Note, the magnified picture of his hat, shown on the bootm image! We are grateful to the two external reviewers: Prof. Dr. Christoph Stampfer (RWTH
Our paper entitled “Spectroscopy of the superconducting proximity effect in nanowires using integrated quantum dots” appeared in the new open access Nature Journal Communications Physics. We investigated the very first superconductor-nanowire hybrid devices with tunnel barriers grown during the nanowire
Our paper entitled “New Generation of Moiré Superlattices in Doubly Aligned hBN/ Graphene/hBN Heterostructures” appeared in Nano Letters. Two incommensurate lattices in contact generate a Moiré superlattice. This happens for the pair hBN-G (hexagonal boron nitride-graphene). Take encapsulated graphene hBN-G-hBN.
Editors’ Suggestion Simon Zihlmann et al. “Nonequilibrium properties of graphene probed by superconducting tunnel spectroscopy”, Phys. Rev. B 99, 075419 (2019) In a conductor the current is carried by electrons. In a macroscopic conductor, the charge distribution is in local equilibrium,
Wideband and On-Chip Excitation for Dynamical Spin Injection into Graphene Graphene is an ideal material for spin transport, as very long spin-relaxation times and lengths can be achieved even at room temperature. However, electrical spin injection is challenging due to
Simon Zihlmann successfully defended his PhD thesis “Spin and charge relaxation in graphene” on Friday 13th of April. We welcomed Prof. Dr. Bart J. van Wees (Univ. Groningen) and Porf. Dr. Christoph Stampfer (Univ. Aachen) as external PhD committee members.
We have always been open to side-projects leading to applications. One was CNT reinforced composites where we have written an influential patent. The other is the exploration of ion-sensitive field-effect transistors for biochemical sensing. Though there was a substantial literature,
We have demonstrated efficient spin-injection into graphene using h-BN as tunneling barrier. We have used CVD-grown h-BN on CVD graphene, as well as few layer h-BN on a graphene h-BN stack. We have also looked into tunneling barriers made from