23 citations · 81 across the 9 of their papers we have counts for
9 papers
In-situ electro-optic sampling of microwave signals under cryogenic conditions and for superconducting applications
Shekhar Priyadarshi, Rinis Ferizaj, Oliver Kieler +8
We demonstrate a cryogenic electro-optic sampling (EOS) setup that allows for the measurement of microwave signals at arbitrary positions on a cryogenic chip-scale device. We use a…
Magnetic- and electric-field-induced anomalous Hall currents from optical excitation of Landau transitions in bulk GaAs
Christoph Dresler, Shekhar Priyadarshi, Mark Bieler
We study a certain type of anomalous Hall current in magnetically- and electrically-biased bulk GaAs samples under the formation of Landau levels. The currents are generated by ult…
Cryogenic fiber-coupled electro-optic characterization platform for high-speed photodiodes
Shekhar Priyadarshi, Hao Tian, Alexander Fernandez Scarioni +5
We have developed a cryogenic characterization platform for ultrafast photodiodes, whose time domain responses are extracted by electro-optic sampling using femtosecond laser pulse…
Ultrafast shift and rectification photocurrents in GaAs quantum wells: Excitation intensity dependence and the importance of bandmixing
H. T. Duc, R. Podzimski, S. Priyadarshi +2
A microscopic approach that is based on the multisubband semiconductor Bloch equations formulated in the basis of a 14-band model is employed to com…
Ultrafast magneto-photocurrents as probe of anisotropy relaxation in GaAs
Christian B. Schmidt, Shekhar Priyadarshi, Klaus Pierz +1
We induce ultrafast photocurrents in a GaAs crystal exposed to a magnetic field by optical femtosecond excitation. The magneto-photocurrents are studied by time-resolved detection…
Detection of the anomalous velocity with sub-picosecond time resolution in semiconductor nanostructures
Shekhar Priyadarshi, Klaus Pierz, Mark Bieler
We report on the time-resolved detection of the anomalous velocity, constituting charge carriers moving perpendicular to an electric driving field, in undoped GaAs quantum wells. F…
Ultrafast magneto-photocurrents in GaAs: Separation of surface and bulk contributions
Christian B. Schmidt, Shekhar Priyadarshi, Sergey A. Tarasenko +1
We induce ultrafast magneto-photocurrents in a GaAs crystal employing interband excitation with femtosecond laser pulses at room temperature and non-invasively separate surface and…
All-optically induced currents resulting from frequency modulated coherent polarization
Shekhar Priyadarshi, Klaus Pierz, Mark Bieler
We employ polarization-shaped ultrafast optical pulses to generate photocurrents which only arise if the optically induced coherent polarization is frequency modulated. This freque…
All-optically induced ultrafast photocurrents: Beyond the instantaneous coherent response
Shekhar Priyadarshi, Klaus Pierz, Mark Bieler
It is demonstrated that the non-instantaneous response of the optically induced coherent polarization tremendously influences the real-space shift of electronic charges in semicond…