Excitonic Phenomena




We explore the transport and confinement of long-living spatially indirect dipolar excitons, electric-field-induced via the quantum-confined Stark effect in a double quantum well, aiming for a better understanding of many-body phenomena in dipolar excitonic ensembles, in which the attractive forces between electrons in one quantum well and holes in the adjacent one cause excitonic binding and are complemented by in-plane repulsive forces of the thus formed dipoles. Depending on confinement, excitonic densities, and temperature, these interactions are expected to possibly result in phase transitions ranging from Wigner crystallization of such dipolar excitons via Bose-Einstein condensation in fully confined systems to a Mott transition into an electron-hole plasma at highest densities.


Recent Highlights 

Confocal shift interferometry of coherent emission from trapped dipolar excitons

Many body correlations of electrostatically trapped dipolar excitons

Quantum trap of a single exciton inside double InGaAs quantum wells

Dynamics of indirect excitons in low-dimensional potential landscapes

Tunable emission from excitonic traps and antitraps

Quantum Hall signatures of dipolar Mahan excitons



Jörg P. Kotthaus (LMU München), Katarzyna Kowalik-Seidl (LMU München), Georg Schinner (LMU München), Dieter Schuh (Regensburg, Germany), Werner Wegscheider (Zürich, Switzerland), Alexander Govorov (Ohio, USA), Andreas Wieck (Bochum, Germany)


Recent Publications

A list of recent publications can be found here.



Funding by the following institutions is gratefully acknowledged: 

DFG project KO-416/17

Nanosystems Initiative Munich

TUM Technische Universität München TUM Technische Universität München Physik Department Elektrotechnik und Informationstechnik TUM Technische Universität München


Prof. Alex Holleitner
Tel: +49 89 289 11575
Office: Z1.005

Group Members