Berlin 2014 – scientific programme
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SYQS: Symposium Characterization and control of complex quantum systems
SYQS 2: Characterization and control of complex quantum systems II
SYQS 2.2: Talk
Friday, March 21, 2014, 14:30–14:45, Audimax
Designing Disorder-Assisted Energy Transfer — •Mattia Walschaers1,2, Roberto Mulet1,3, and Andreas Buchleitner1 — 1Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, D-79104 Freiburg, Germany — 2Instituut voor Theoretische Fysica, KU Leuven, Celestijnenlaan 200D, B-3001 Heverlee, Belgium — 3Complex Systems Group, Department of Theoretical Physics, University of Havana, Havana, Cuba
Common wisdom suggests that complex structures typically have a negative impact on quantum transport, due to localization phenomena and the strong fluctuations which they cause. We show that localization and strong fluctuations can also be used to the benefit of transport.
By controlling typical spectral properties of an ensemble of complex systems, we design localization properties. In doing so, we can build systems such that the energy transport is mainly governed by only two scattering resonances.
When, however, these resonances start to overlap considerably, the transfer efficiency decreases drastically. We explain that a suitable control of some average properties of the energy spectrum gives rise to a statistical repulsion between the two scattering resonances. Hereby we can avoid drastic losses of the transfer efficiency, rendering the transport mechanism very robust.