326 citations · 971 across the 20 of their papers we have counts for
19 papers · 1 filter
Interference dislocations in condensate of indirect excitons
J. R. Leonard, Lunhui Hu, A. A. High +5
Phase singularities in quantum states play a significant role both in the state properties and in the transition between the states. For instance, a transition to two-dimensional s…
Exciton gas transport through nano-constrictions
Chao Xu, J. R. Leonard, C. J. Dorow +4
An indirect exciton is a bound state of an electron and a hole in spatially separated layers. Two-dimensional indirect excitons can be created optically in heterostructures contain…
High-mobility indirect excitons in wide single quantum well
C. J. Dorow, M. W. Hasling, D. J. Choksy +4
Indirect excitons (IXs) are bound pairs of electrons and holes confined in spatially separated layers. We present wide single quantum well (WSQW) heterostructures with high IX mobi…
Split-gate device for indirect excitons
C. J. Dorow, J. R. Leonard, M. M. Fogler +3
We present a concept and experimental proof of principle for split-gate devices for indirect excitons (IXs). The split-gate forms a narrow channel, a point contact, for IX current.…
Pancharatnam-Berry phase in condensate of indirect excitons
J. R. Leonard, A. A. High, A. T. Hammack +4
We report on the observation of the Pancharatnam-Berry phase in a condensate of indirect excitons (IXs) in a GaAs coupled quantum well structure. The Pancharatnam-Berry phase leads…
Indirect excitons in a potential energy landscape created by a perforated electrode
C. J. Dorow, Y. Y. Kuznetsova, J. R. Leonard +5
We report on the principle and realization of an excitonic device: a ramp that directs the transport of indirect excitons down a potential energy gradient created by a perforated e…
Measurement of exciton correlations using electrostatic lattices
M. Remeika, J. R. Leonard, C. J. Dorow +4
We present a method for determining correlations in a gas of indirect excitons in a semiconductor quantum well structure. The method involves subjecting the excitons to a periodic…
Stirring Potential for Indirect Excitons
M. W. Hasling, Y. Y. Kuznetsova, P. Andreakou +6
We demonstrate experimental proof of principle for a stirring potential for indirect excitons. The azimuthal wavelength of this stirring potential is set by the electrode periodici…
Nonlinear optical spectroscopy of indirect excitons in biased coupled quantum wells
P. Andreakou, S. Cronenberger, D. Scalbert +9
Indirect excitons in coupled quantum wells are long-living quasi-particles, explored in the studies of collective quantum states. We demonstrate, that despite the extremely low osc…
Optically Controlled Excitonic Transistor
P. Andreakou, S. V. Poltavtsev, J. R. Leonard +7
Optical control of exciton fluxes is realized for indirect excitons in a crossed-ramp excitonic device. The device demonstrates experimental proof of principle for all-optical exci…
Ballistic spin transport in exciton gases
A. V. Kavokin, M. Vladimirova, B. Jouault +3
Traditional spintronics relies on spin transport by charge carriers, such as electrons in semiconductor crystals. This brings several complications: the Pauli principle prevents th…
Spin currents in a coherent exciton gas
A. A. High, A. T. Hammack, J. R. Leonard +8
Spin currents and spin textures are observed in a coherent gas of indirect excitons. Applied magnetic fields bend the spin current trajectories and transform patterns of linear pol…
Transport of Indirect Excitons in a Potential Energy Gradient
J. R. Leonard, M. Remeika, M. K. Chu +6
We realized a potential energy gradient - a ramp - for indirect excitons using a shaped electrode at constant voltage. We studied transport of indirect excitons along the ramp and…
Excitation Energy Dependence of the Exciton Inner Ring
Y. Y. Kuznetsova, J. R. Leonard, L. V. Butov +4
We report on the excitation energy dependence of the inner ring in the exciton emission pattern. The contrast of the inner ring is found to decrease with lowering excitation energy…
Spontaneous Coherence in a Cold Exciton Gas
Alexander A. High, Jason R. Leonard, Aaron T. Hammack +5
Excitons, bound pairs of electrons and holes, form a model system to explore the quantum physics of cold bosons in solids. Cold exciton gases can be realized in a system of indirec…
Spin Texture in a Cold Exciton Gas
A. A. High, A. T. Hammack, J. R. Leonard +5
We report on the observation of a spin texture in a cold exciton gas in a GaAs/AlGaAs coupled quantum well structure. The spin texture is observed around the exciton rings. The obs…
Electrostatic Conveyer for Excitons
A. G. Winbow, J. R. Leonard, M. Remeika +9
We report on the study of indirect excitons in moving lattices - conveyers created by a set of AC voltages applied to the electrodes on the sample surface. The wavelength of this m…
Spin transport of indirect excitons
J. R. Leonard, Y. Kuznetsova, Sen Yang +4
Spin transport of indirect excitons in GaAs/AlGaAs coupled quantum wells was observed by measuring the spatially resolved circular polarization of exciton emission. Exciton spin tr…
Spin transport of indirect excitons in GaAs coupled quantum wells
J. R. Leonard, Sen Yang, L. V. Butov +1
Spin transport of indirect excitons in GaAs/AlGaAs coupled quantum wells was observed by measuring the spatially resolved circular polarization of the exciton emission. The exciton…