Zobrazeno 1 - 10
of 67
pro vyhledávání: '"Priyadarshi, Shekhar"'
We study anomalous Hall currents in magnetically-biased bulk GaAs samples under the formation of Landau levels. The anomalous Hall currents are generated by ultrafast optical excitation of spin-polarized carriers and detected by time-resolved measure
Externí odkaz:
http://arxiv.org/abs/2410.05170
Autor:
Priyadarshi, Shekhar, Tian, Hao, Scarioni, Alexander Fernandez, Wolter, Silke, Kieler, Oliver, Kohlmann, Johannes, Nissilä, Jaani, Bieler, Mark
We have developed a cryogenic characterization platform for ultrafast photodiodes, whose time domain responses are extracted by electro-optic sampling using femtosecond laser pulses in a pump-probe configuration. The excitation of the photodiodes wit
Externí odkaz:
http://arxiv.org/abs/2309.06189
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 of the simultaneously emitted THz radiation. We find that their dynami
Externí odkaz:
http://arxiv.org/abs/1601.02962
Publikováno v:
Phys. Rev. Lett. 115, 257401 (2015)
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. For this we optically excite the quantum wells with circularly polarize
Externí odkaz:
http://arxiv.org/abs/1510.02231
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 bulk contributions to the overall current response. The separation be
Externí odkaz:
http://arxiv.org/abs/1502.04474
Akademický článek
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Publikováno v:
Appl. Phys. Lett. 102, 112102 (2013)
We employ polarization-shaped ultrafast optical pulses to generate photocurrents which only arise if the optically induced coherent polarization is frequency modulated. This frequency modulation is obtained via detuned excitation of light-hole excito
Externí odkaz:
http://arxiv.org/abs/1302.4633
Publikováno v:
Phys. Rev. Lett. 109, 216601 (2012)
It is demonstrated that the non-instantaneous response of the optically induced coherent polarization tremendously influences the real-space shift of electronic charges in semiconductors. The possibility to coherently control this real-space shift wi
Externí odkaz:
http://arxiv.org/abs/1209.1473
Akademický článek
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