141 citations · 328 across the 9 of their papers we have counts for
9 papers
Carbon Irradiated SI-GaAs for Photoconductive THz Detection
Abhishek Singh, Sanjoy Pal, Harshad Surdi +5
We report here a photoconductive material for THz generation and detection with sub-picosecond carrier lifetime made by C12 (Carbon) irradiation on commercially available semi-insu…
Improved Efficiency of Photoconductive THz Emitters by Increasing the Effective Contact Length of Electrodes
Abhishek Singh, Harshad Surdi, V. V. Nikesh +2
We study the effect of a surface modification at the interface between metallic electrodes and semiconducting substrate in Semi-Insulating GaAs (SI-GaAs) based photoconductive emit…
Arrayed Continuous-wave THz Photomixers
S. T. Bauerschmidt, S. Malzer, G. H. Döhler +3
We present both chip-scale and free space coherent arrays of continuous-wave THz photomixers. By altering the relative phases of the exciting laser signals, the relative THz phase…
On the Connection of Anisotropic Conductivity to Tip Induced Space Charge Layers in Scanning Tunneling Spectroscopy of p-doped GaAs
S. Loth, M. Wenderoth, R. G. Ulbrich +2
The electronic properties of shallow acceptors in p-doped GaAs{110} are investigated with scanning tunneling microscopy at low temperature. Shallow acceptors are known to exhibit d…
Probing electrodynamical properties of the edge states in a quantum Hall system by surface photovoltage spectroscopy
B. Karmakar, G. H. Dohler, B. M. Arora
An importent question regarding the dissipation-less current carried by the edge states in a quantum Hall system is understanding the results of the electrodynamical interaction am…
Spin lifetimes and strain-controlled spin precession of drifting electrons in zinc blende type semiconductors
M. Beck, C. Metzner, S. Malzer +1
We study the transport of spin polarized electrons in n-GaAs using spatially resolved continuous wave Faraday rotation. From the measured steady state distribution, we determine sp…
Intersubband gain in a Bloch oscillator and Quantum cascade laser
Harald Willenberg, Gottfried H. Dohler, Jerome Faist
The link between the inversion gain of quantum cascade structures and the Bloch gain in periodic superlattices is presented. The proposed theoretical model based on the density mat…
Excitonic photoluminescence in symmetric coupled double quantum wells subject to an external electric field
J. Soubusta, R. Grill, P. Hlidek +5
The effect of an external electric field F on the excitonic photoluminescence (PL) spectra of a symmetric coupled double quantum well (DQW) is investigated both theoretically and e…
Inelastic quantum transport in superlattices: success and failure of the Boltzmann equation
A. Wacker, A. -P. Jauho, S. Rott +3
Electrical transport in semiconductor superlattices is studied within a fully self-consistent quantum transport model based on nonequilibrium Green functions, including phonon and…