Nonlinear magneto-gyrotropic photogalvanic effect (2009)
Diehl, Helgi, Shalygin, Vadim, Golub, Leonid, Tarasenko, Sergey, Danilov, Sergey, Belkov, Vassilij, ...
We report on the observation of magnetic-field-induced photocurrent in HgTe/HgCdTe quantum wells of different widths. Both the intrasubband and interband absorption of infrared/terahertz radiation in...
Nonlinear magneto-gyrotropic photogalvanic effect (2009)
Diehl, H., Shalygin, V. A., Golub, L. E., Tarasenko, S. A., Danilov, S. N., Bel'kov, V. V., ...
We report on the observation of nonlinear magneto-gyrotropic photogalvanic effect in HgTe/HgCdTe quantum wells. The interband absorption of mid-infrared radiation as well as the intrasubband...
Ballistic Intrinsic Spin-Hall Effect in HgTe Nanostructures (2008)
Bruene, C., Roth, A., Novik, E. G., Koenig, M., Buhmann, H., Hankiewicz, E. M., ...
We report the first electrical manipulation and detection of the mesoscopic intrinsic spin-Hall effect (ISHE) in semiconductors through non-local electrical measurement in nano-scale H-shaped...
Quantum dot as thermal rectifier (2007)
Scheibner, R., Koenig, M., Reuter, D., Wieck, A. D., Buhmann, H., Molenkamp, L. W.
We report the observation of thermal rectification in a semiconductor quantum dot, as inferred from the asymmetric line shape of the thermopower oscillations. The asymmetry is observed at high...
Scheibner, R., Novik, E. G., Borzenko, T., Koenig, M., Reuter, D., Wieck, A. D., ...
We have studied the temperature dependent thermopower of gate-defined, lateral quantum dots in the Coulomb blockade regime using an electron heating technique. The line shape of the thermopower...
Direct observation of the Aharonov-Casher phase (2005)
Koenig, M., Tschetschetkin, A., Hankiewicz, E. M., Sinova, Jairo, Hock, V., Daumer, V., ...
Ring structures fabricated from HgTe/HgCdTe quantum wells have been used to study Aharonov-Bohm type conductance oscillations as a function of Rashba spin-orbit splitting strength. We observe...
Trion formation in narrow GaAs quantum well structures (2005)
Teran, F. J., Eaves, L., Mansouri, L., Buhmann, H., Maude, D. K., Potemski, M., ...
Thermopower of a Kondo-correlated quantum dot (2004)
Scheibner, R., Buhmann, H., Reuter, D., Kiselev, M. N., Molenkamp, L. W.
The thermopower of a Kondo-correlated gate-defined quantum dot is studied using a current heating technique. In the presence of spin correlations the thermopower shows a clear deviation from the...
Band structure of semimagnetic Hg1-yMnyTe quantum wells (2004)
Novik, E. G., Pfeuffer-Jeschke, A., Jungwirth, T., Latussek, V., Becker, C. R., Landwehr, G., ...
The band structure of semimagnetic Hg_1-yMn_yTe/Hg_1-xCd_xTe type-III quantum wells has been calculated using eight-band kp model in an envelope function approach. Details of the band structure...
Giant spin-orbit splitting in a HgTe quantum well (2004)
Gui, Y. S., Becker, C. R., Dai, N., Liu, J., Qiu, Z. J., Novik, E. G., ...
We have investigated beating patterns in Shubnikov-de Haas oscillations for HgTe/Hg_{0.3}Cd_{0.7}Te(001) quantum wells with electron densities of 2 to 3 X 10^{12} cm^{-2}. Up to 12 beating nodes have...
Low-field diffusion magneto-thermopower of a high mobility two-dimensional electron gas (2004)
Maximov, S., Gbordzoe, M., Buhmann, H., Molenkamp, L. W., Reuter, D.
The low magnetic field diffusion thermopower of a high mobility GaAs-heterostructure has been measured directly on an electrostatically defined micron-scale Hall-bar structure at low temperature (T =...
Current heating of a magnetic 2DEG in HgMnTe/HgCdTe quantum wells (2003)
Gui, Y. S., Becker, C. R., Liu, J., Koenig, M., Daumer, V., Kiselev, M. N., ...
Heating caused by electrons with excess kinetic energy has been investigated in a magnetic two-dimensional electron gas, M2DEG, in HgMnTe/HgCdTe(001) quantum wells. The temperature of the Mn ions,...
Gurzhi, R. N., Kopeliovich, A. I., Kalinenko, A. N., Yanovsky, A. V., Bogachek, E. N., Landman, Uzi, ...
A theory is developed for the evolution of the non-equilibrium distribution of quasiparticles when the scattering rate decreases due to particle collisions. We propose a "modified one-collision...
Quasi-ballistic transport in HgTe quantum-well nanostructures (2003)
Daumer, V., Golombek, I., Gbordzoe, M., Novik, E. G., Hock, V., Becker, C. R., ...
The transport properties of micrometer scale structures fabricated from high-mobility HgTe quantum-wells have been investigated. A special photoresist and Ti masks were used, which allow for the...
Electron-beam propagation in a two-dimensional electron gas (2002)
Novik, E. G., Buhmann, H., Molenkamp, L. W.
A quantum mechanical model based on a Green's function approach has been used to calculate the transmission probability of electrons traversing a two-dimensional electron gas injected and detected...
Interplay of Rashba, Zeeman and Landau splitting in a magnetic two dimensional electron gas (2002)
Gui, Y. S., Becker, C. R., Liu, J., Daumer, V., Hock, V., Buhmann, H., ...
The transport properties of a magnetic two dimensional electron gas consisting of a modulation doped n type HgMnTe/HgCdTe quantum well, QW, have been investigated. By analyzing the Shubnikov-de Haas...
Angle-Resolved Spectroscopy of Electron-Electron Scattering in a 2D System (2000)
Yanovsky, A. V., Predel, H., Buhmann, H., Gurzhi, R. N., Kalinenko, A. N., Kopeliovich, A. I., ...
Electron-beam propagation experiments have been used to determine the energy and angle dependence of electron-electron (ee) scattering a two-dimensional electron gas (2DEG) in a very direct manner by...
Predel, H., Buhmann, H., Molenkamp, L. W., Gurzhi, R. N., Kalinenko, A. N., Kopeliovich, A. I., ...
We have studied experimentally and theoretically the influence of electron-electron collisions on the propagation of electron beams in a two-dimensional electron gas for excess injection energies...
Probing the potential landscape inside a two-dimensional electron-gas (1999)
Koonen, J. J., Buhmann, H., Molenkamp, L. W.
We report direct observations of the scattering potentials in a two-dimensional electron-gas using electron-beam diffaction-experiments. The diffracting objects are local density-fluctuations caused...
The Thermopower of Quantum Chaos (1998)
Godijn, S. F., Moeller, S., Buhmann, H., Molenkamp, L. W., Van Langen, S. A.
The thermovoltage of a chaotic quantum dot is measured using a current heating technique. The fluctuations in the thermopower as a function of magnetic field and dot shape display a non-Gaussian...