108 citations · 146 across the 5 of their papers we have counts for
5 papers
Stable Branched Electron Flow
B A Braem, C Gold, S Hennel +6
The pattern of branched electron flow revealed by scanning gate microscopy shows the distribution of ballistic electron trajectories. The details of the pattern are determined by t…
Scanning Gate Microscopy in a Viscous Electron Fluid
Beat A Braem, Francesco M D Pellegrino, Alessandro Principi +10
We measure transport through a Ga[Al]As heterostructure at temperatures between 0.1 K and 30 K. Increasing the temperature enhances the electron-electron scattering rate and viscou…
Temperature-stabilized differential amplifer for low-noise DC measurements
P. Märki, B. A. Braem, T. Ihn
A tabletop low-noise differential amplifer with a bandwidth of 100 kHz is presented. Low voltage drifts of the order of 100 nV/day are reached by thermally stabilizing relevant amp…
Investigating Energy Scales of Fractional Quantum Hall States using Scanning Gate Microscopy
Beat A. Braem, Tobias Krähenmann, Szymon Hennel +4
We use the voltage biased tip of a scanning force microscope at a temperature of 35\,mK to locally induce the fractional quantum Hall state of in a split-gate defined const…
Non-local polarization feedback in a fractional quantum Hall ferromagnet
Szymon Hennel, Beat A. Braem, Stephan Baer +11
In a quantum Hall ferromagnet, the spin polarization of the two-dimensional electron system can be dynamically transferred to nuclear spins in its vicinity through the hyperfine in…