13,208 research outputs found
Betti numbers of the moduli space of rank 3 parabolic Higgs bundles
We compute the Betti numbers of the moduli space of rank 3 parabolic Higgs
bundles, using Morse theory. A key point is that certain critical submanifolds
of the Morse function can be identified with moduli spaces of parabolic
triples. These moduli spaces come in families depending on a real parameter and
we study their variation with this parameter.Comment: 78 pages. Extended version. Added a section with the fixed
determinant case. To appear in Memoirs of the AM
Optical pumping of charged excitons in unintentionally doped InAs quantum dots
As an alternative to commonly used electrical methods, we have investigated
the optical pumping of charged exciton complexes addressing impurity related
transitions with photons of the appropriate energy. Under these conditions, we
demonstrate that the pumping fidelity can be very high while still maintaining
a switching behavior between the different excitonic species. This mechanism
has been investigated for single quantum dots of different size present in the
same sample and compared with the direct injection of spectator electrons from
nearby donors.Comment: 4 pages and 3 figures submitted to AP
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