Coherent Aharonov Bohm oscillations in type-II (ZnMn)Te quantum dots (2008)
Sellers, I. R., Whiteside, V. R., Govorov, A. O., Fan, W. C., Chou, W-C., Khan, I., ...
The magneto-photoluminescence of type-II (ZnMn)Te quantum dots is presented. As a result of the type-II band alignment Aharonov-Bohm (AB) oscillations in the photoluminescence intensity are evident,...
Aharanov-Bohm excitons at elevated temperatures in type-II ZnTe/ZnSe quantum dots (2007)
Sellers, I. R., Whiteside, V. R., Kuskovsky, I. L., Govorov, A. O., McCombe, B. D.
Optical emission from type-II ZnTe/ZnSe quantum dots demonstrates large and persistent oscillations in both the peak energy and intensity indicating the formation of coherently rotating states....
Optical Aharonov-Bohm effect in stacked type-II quantum dots (2006)
Kuskovsky, Igor L, MacDonald, W., Govorov, A. O., Muroukh, L., Wei, X., Tamargo, M. C., ...
Excitons in vertically stacked type-II quantum dots experience the topological magnetic phase and demonstrate the Aharonov-Bohm oscillations in the emission intensity. Photoluminescence of vertically...
Richardson, H. H., Hickman, Z. N., Govorov, A. O., Thomas, A. C., Zhang, W, Kordesch, M. E.
We investigate the system of optically excited gold NPs in an ice matrix aiming to understand heat generation and melting processes at the nanoscale level. Along with the traditional fluorescence...
Spin polarized photocurrent from quantum dots (2005)
Villas-Boas, J. M., Ulloa, Sergio E., Govorov, A. O.
In this paper we show that it is possible to switch the spin polarization of the photocurrent signal obtained from a single self-assembled quantum dot photodiode under the effect of elliptically...
Decoherence of Rabi oscillations in a single quantum dot (2004)
Villas-Boas, J. M., Ulloa, Sergio E., Govorov, A. O.
We develop a realistic model of Rabi oscillations in a quantum-dot photodiode. Based in a multi-exciton density matrix formulation we show that for short pulses the two-level models fails and higher...
Govorov, A. O., Kalameitsev, A. V.
We consider the optical properties of a single magnetic impurity in a self-assembled quantum dot. We show that using the resonant pumping one can address and manipulate selectively individual spin...
Govorov, A. O., Kalameitsev, A. V., Dulka, J. P.
We describe theoretically the process of multi-beam reflection in a two-dimensional electron system with a lateral potential barrier. Due to spin-orbital interaction, the reflection process leads to...
Coherent control of tunneling in a quantum dot molecule (2004)
Villas-Boas, J. M., Govorov, A. O., Ulloa, Sergio E.
We demonstrate theoretically that it is possible to use Rabi oscillations to coherently control the electron tunneling in an asymmetric double quantum dot system, a quantum dot molecule. By applying...
Spin-polarized reflection of electrons in a two-dimensional electron system (2003)
Chen, Hong, Heremans, J. J., Peters, J. A., Dulka, J. P., Govorov, A. O., Goel, N., ...
We present a method to create spin-polarized beams of ballistic electrons in a two-dimensional electron system in the presence of spin-orbit interaction. Scattering of a spin-unpolarized injected...
Spin and energy transfer in nanocrystals without transport of charge (2003)
We describe a mechanism of spin transfer between individual quantum dots that does not require tunneling. Incident circularly-polarized photons create inter-band excitons with non-zero electron spin...
Aharonov-Bohm signature for neutral excitons in type-II quantum dot ensembles (2003)
Ribeiro, E., Medeiros-Ribeiro, G., Carvalho Jr., W., Govorov, A. O.
It is commonly believed that the Aharonov-Bohm (AB) effect is a typical feature of the motion of a charged particle interacting with the electromagnetic vector potential. Here we present a...
Hydrodynamic pumping of a quantum Fermi liquid in a semiconductor heterostructure (2003)
Heremans, J. J., Govorov, A. O., Kantha, D., Nikodijevic, Z.
We describe both experimentally and theoretically a hydrodynamic pumping mechanism in a Fermi liquid, arising from electron-electron interaction. An electron beam sweeping past an aperture is...
Kondo-excitons and Auger processes in self-assembled quantum dots (2003)
Govorov, A. O., Karrai, K., Warburton, R. J., Kalameitsev, A. V.
We describe theoretically novel excitons in self-assembled quantum dots interacting with a two-dimensional electron gas in the wetting layer. In the presence of the Fermi sea, the optical lines...
Kondo excitons in self-assembled quantum dots (2002)
Govorov, A. O., Karrai, K., Warburton, R. J.
We describe novel excitons in quantum dots by allowing for an interaction with a Fermi sea of electrons. We argue that these excitons can be realized very simply with self-assembled quantum dots,...
Polarized excitons in nanorings and the `optical' Aharonov-Bohm effect (2002)
Govorov, A. O., Ulloa, S. E., Karrai, K., Warburton, R. J.
The quantum nature of matter lies in the wave function phases that accumulate while particles move along their trajectories. A prominent example is the Aharonov-Bohm phase, which has been studied in...
Magneto-optical properties of charged excitons in quantum dots (2002)
Govorov, A. O., Schulhauser, C., Haft, D., Kalameitsev, A. V., Chaplik, A., Warburton, R. J., ...
We present both experimental and theoretical results on the influence of a magnetic field on excitons in semiconductor quantum dots. We find a pronounced difference between the strong and weak...
Acousto-Electric Transport Through a Two-Dimensional System in the Nonlinear Regime (2002)
Govorov, A. O., Rotter, M., Streibl, M., Rocke, C., Kalamseitsev, A. V.
Surface acoustic waves strongly interact with a two-dimensional electron plasma in hybrid semiconductor piezoelectric structures. At high intensities of a surface acoustic wave. nonlinear effects...
Magnetoexcitons in quantum-ring structures: a novel magnetic interference effect (2001)
Ulloa, S. E., Govorov, A. O., Kalameitsev, A. V., Warburton, R., Karrai, K.
A novel magnetic interference effect is proposed for a neutral, but polarizable exciton in a quantum ring with a finite width. The magnetic interference effect originates from the nonzero dipole...
Govorov, A. O., Kalameitsev, A. V., Warburton, R., Karrai, K., Ulloa, S. E.
We study theoretically the magnetic field effect on a neutral, but polarizable exciton confined in quantum-ring structures. For excitons with a nonzero dipole moment, a novel magnetic interference...
Govorov, A. O., Kalameitsev, A. V., Kovalev, V. M.
We develop a quantum theory of the nonlinear interaction between intense surface acoustic waves and electrons of a quantum well in the regime of moving quantum wires and dots. The quantum nonlinear...
Self-Induced Acoustic Transparency in Semiconductor Quantum Films (2001)
Govorov, A. O., Kalameitsev, A. V., Kovalev, V. M., Wixforth, A.
Nonlinear acousto-electric transport in a two-dimensional electron system (2000)
Govorov, A. O., Kalameitsev, A. V., Rotter, M., Wixforth, A., Kotthaus, J. P., Hoffmann, K. H., ...
We study both theoretically and experimentally the nonlinear interaction between an intense surface acoustic wave and a two-dimensional electron plasma in semiconductor-piezocrystal hybrid...
Spectroscopy of nanoscopic semiconductor rings (1999)
Lorke, A., Luyken, R. J., Govorov, A. O., Kotthaus, J. P., Garcia, J. M., Petroff, P. M.
Making use of self-assembly techniques, we demonstrate the realization of nanoscopic semiconductor quantum rings in which the electronic states are in the true quantum limit. We employ two...
Voltage-controlled trapping of excitons and “storage of light” in lateral superlattices (1998)
Zimmermann, S., Govorov, A. O., Wixforth, A., Rocke, C., Hansen, W., Kotthaus, J.P., ...
Voltage-controlled lateral superlattices of various periods are employed to demonstrate the trapping of photogenerated excitons in quasi-one-dimensional regions and to store light in form of ionised...
Spatially resolved exciton trapping in a voltage-controlled lateral superlattice (1998)
Zimmermann, S., Schedelbeck, Gert, Govorov, A. O., Wixforth, A., Kotthaus, J.P., Bichler, Max, ...
With spatially resolved photoluminescence experiments we demonstrate voltage-controlled trapping of excitons in a submicron scale lateral potential superlattice imposed on a semiconductor quantum...
Lateral superlattices as voltage-controlled traps for excitons (1997)
Zimmermann, S., Govorov, A. O., Hansen, W., Kotthaus, J., Bichler, Max, Wegscheider, Werner
We demonstrate the localization of quantum-well excitons in a periodic array of linear traps using photoluminescence experiments. The excitonic traps are induced by applying spatially alternating...
Lateral superlattices as voltage-controlled traps for excitons (1997)
Zimmermann, S., Govorov, A. O., Hansen, W., Kotthaus, J. P., Bichler, M., Wegscheider, W.
We demonstrate the localisation of quantum well excitons in a periodic array of linear traps using photoluminescence experiments. The excitonic traps are induced by applying spatially alternating...