Zobrazeno 1 - 10
of 264
pro vyhledávání: '"Hohls, F."'
Autor:
Buonacorsi, B., Sfigakis, F., Shetty, A., Tam, M. C., Kim, H. S., Harrigan, S. R., Hohls, F., Reimer, M. E., Wasilewski, Z. R., Baugh, J.
Publikováno v:
Applied Physics Letters 119, 114001 (2021)
We have realized quantized charge pumping using non-adiabatic single-electron pumps in dopant-free GaAs two-dimensional electron gases (2DEGs). The dopant-free III-V platform allows for ambipolar devices, such as p-i-n junctions, that could be combin
Externí odkaz:
http://arxiv.org/abs/2102.13320
Publikováno v:
Phys. Rev. Lett. 124, 127701 (2020)
We demonstrate the trapping of electrons propagating ballistically at far-above-equilibrium energies in GaAs/AlGaAs heterostructures in high magnetic field. We find low-loss transport along a gate-modified mesa edge in contrast to an effective decay
Externí odkaz:
http://arxiv.org/abs/1902.11253
Autor:
Mirovsky, P., Fricke, L., Hohls, F., Kaestner, B., Leicht, Ch., Pierz, K., Melcher, J., Schumacher, H. W.
Publikováno v:
J. Appl. Phys. 113, 213704 (2013)
The generation of ac modulated quantized current waveforms using a semiconductor non-adiabatic single electron pump is demonstrated. In standard operation the single electron pump generates a quantized output current of I = ef where e is the charge o
Externí odkaz:
http://arxiv.org/abs/1303.5565
Publikováno v:
Scientific Reports 2, 374 (2012)
Studies of non-equilibrium current fluctuations enable assessing correlations involved in quantum transport through nanoscale conductors. They provide additional information to the mean current on charge statistics and the presence of coherence, diss
Externí odkaz:
http://arxiv.org/abs/1204.5089
Autor:
Leicht, C., Mirovsky, P., Kaestner, B., Hohls, F., Kashcheyevs, V., Kurganova, E. V., Zeitler, U., Weimann, T., Pierz, K., Schumacher, H. W.
Publikováno v:
Semicond. Sci. Technol. 26, 055010 (2011)
We operate an on-demand source of single electrons in high perpendicular magnetic fields up to 30T, corresponding to a filling factor below 1/3. The device extracts and emits single charges at a tunable energy from and to a two-dimensional electron g
Externí odkaz:
http://arxiv.org/abs/1009.5897
Publikováno v:
Phys. Rev. Lett. 99, 206602 (2007)
We show that the intriguing observation of noise enhancement in the charge transport through two vertically coupled quantum dots can be explained by the interplay of quantum coherence and strong Coulomb blockade. We demonstrate that this novel mechan
Externí odkaz:
http://arxiv.org/abs/0706.1737
We explore the full counting statistics of single electron tunneling through a quantum dot using a quantum point contact as non-invasive high bandwidth charge detector. The distribution of counted tunneling events is measured as a function of gate an
Externí odkaz:
http://arxiv.org/abs/0705.2420
Publikováno v:
Physical Review B 75, 233304 (2007)
We present noise measurements of self-assembled InAs quantum dots at high magnetic fields. In comparison to I-V characteristics at zero magnetic field we notice a strong current overshoot which is due to a Fermi-edge singularity. We observe an enhanc
Externí odkaz:
http://arxiv.org/abs/cond-mat/0609738
Publikováno v:
Applied Physics Letters 89, 212103 (2006)
We demonstrate the feasibility of ballistic electron spectroscopy as a new tool for mesoscopic physics. A quantum dot is utilised as an energy-selective detector of non-equilibrium ballistic electrons injected into a two-dimensional electron system.
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607525
Autor:
Schulze-Wischeler, F., Zeitler, U., Zobeltitz, C. v., Hohls, F., Reuter, D., Wieck, A. D., Frahm, H., Haug, R. J.
Using a time-resolved phonon absorption technique, we have measured the specific heat of a two-dimensional electron system in the fractional quantum Hall effect regime. For filling factors $\nu = 5/3, 4/3, 2/3, 3/5, 4/7, 2/5$ and 1/3 the specific hea
Externí odkaz:
http://arxiv.org/abs/cond-mat/0607167