Physikalisch-Technische Bundesanstalt

Heisenberg antiferromagnet with anisotropic exchange on the kagomé lattice: Description of the magnetic properties of volborthite.
Yavors'kii, T.; Apel, W.; Everts, H.-U.;
Physical Review B: 76 (2007), 064430-1 - 064430-19


Nuclear spin relaxation for higher spin.
Apel, W.; Bychkov, Yu. A.
Physical Review B: 63 (2001), 224405-1 - 224405-5


On the high-temperature expansion for a partially filled lowest Landau level.
Sawatdiaree, S., Apel, W.
Physica E: 6 (2000), 1-4, 75 - 78


Skyrmionen in der Festkörperphysik. Ausgedehnte Spinstrukturen als neuartige Quasiteilchen.
Apel, W.
Physikalische Blätter 56 (2000), 39ff


Spin relaxation in quantum Hall systems.
Apel, W.; Bychkov, Y. A
Physical Review Letters: 82, (1999), 16, 3324 - 3327


Random phase approximation for the grand-canonical potential of composite fermions in the half-filled lowest Landau level.
Dietel, J., Koschny, Th., Apel, W., Weller, W.
Eur. Phys. J. B 5 (1998), 439ff


Exact density of states of a two-dimensional electron gas in a strong magnetic field and a long-range correlated random potential.
Spies, L., Apel, W., Kramer, B.
Phys. Rev. B55 (1997) 4057ff


Hopf term and the effective Lagrangian for he Skyrmions in a two-dimensional electron gas at small g-factor.
Apel, W.; Bychkov, Yu. A.
Phys. Rev. Lett. 79 (1997) , 3792-3795