  In a quantum-mechanical system, particle-hole duality implies that instead of
studying particles, we can get equivalent information by studying the missing
particles, the so-called holes. Using this duality picture for rotating fermion
condensates the vortices appear as holes in the Fermi see. Here we predict that
the formation of vortices in quantum dots at high magnetic fields causes
oscillations in the energy spectrum which can be experimentally observed using
accurate tunnelling spectroscopy. We use the duality picture to show that these
oscillations are caused by the localisation of vortices in rings.

Mesoscale and Nanoscale Physics;Strongly Correlated Electrons