Objetivo Groups from different countries in the NIS and western Europe will undertake a coherent investigation of the influence of the surface on electronic excitations in low-dimensional semiconductors systems. Up to now the properties of excitonic transitions in quantum wells, quantum wires and quantum dots have been discussed predominantely on the basis of a pure semiconductor picture. However, very often the low-dimensional structures are located in close proximity to a surface (e.g. quantum wells with thin barriers) or may even be defined by a surface (etched quantum wires and dots). In these structures the replacement of the semiconductor band discontinuities by the much larger electron affinity, the strong change of the dielectric constant and surface mediated recombination channels are expected to control the excitonic transitions to a large degree.Based on samples made at Würzburg University, magnetoluminescence investigations will be carried out at the Institute for Solid State Physics, Chernogolovka, which should enable the influence of the surface to be varied via the magnetic field. At the Physics Institute, Kiev University, the emission involving the spin split valence band will be investigated. By using magneto Raman experiments the strain as well as the electronic and vibronic properties will be analyzed at the Universidad Autonoma of Madrid. A theoretical description of electronic states, optical transitions and electron scattering in surface controlled low-dimensional semiconductor structures will be developed at the Ecole Normale Supérieure in Paris. At Moscow State University surface exciton polaritons will be modelled as well as the possibilities for the observation of an excitonic crystal. The group at the University of Rome will investigate hydrogen passivation effects for surface controlled semiconductor structures. Ultra high spatial resolution studies of the field distribution in quantum wire and dot structures will be performed at the University of Basel. Theoretical studies of the electromagnetic field distribution and polarization effects will be carried out at the General Physics Institute, Moscow. Experiments and theory will be carried out in very close collaboration. Programa(s) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Tema(s) 15 - Condensed Matter Physics Convocatoria de propuestas Data not available Régimen de financiación Data not available Coordinador Julius-Maximilians-Universität Würzburg Aportación de la UE Sin datos Dirección Am Hubland 97074 Würzburg Alemania Ver en el mapa Coste total Sin datos Participantes (8) Ordenar alfabéticamente Ordenar por aportación de la UE Ampliar todo Contraer todo Ecole Normale Supérieure Francia Aportación de la UE Sin datos Dirección 75005 Paris Ver en el mapa Coste total Sin datos Institute of General Physics of the Russian Academy of Sciences Rusia Aportación de la UE Sin datos Dirección 117333 Moscow Ver en el mapa Coste total Sin datos Moscow State University M.V. Lomonosov Rusia Aportación de la UE Sin datos Dirección 119899 Moscow Ver en el mapa Coste total Sin datos National Kiev Taras Shevchenko University Ucrania Aportación de la UE Sin datos Dirección 252127 Kiev Ver en el mapa Coste total Sin datos Russian Academy of Sciences Rusia Aportación de la UE Sin datos Dirección 142432 Chernogolovka, Moscow Ver en el mapa Coste total Sin datos Universidad Autónoma de Madrid España Aportación de la UE Sin datos Dirección 28049 Madrid Ver en el mapa Coste total Sin datos Università degli Studi di Roma La Sapienza Italia Aportación de la UE Sin datos Dirección Piazzale Aldo Moro 2/5 00185 Roma Ver en el mapa Coste total Sin datos Universität Basel Suiza Aportación de la UE Sin datos Dirección 4056 Basel Ver en el mapa Coste total Sin datos