B3: Correlations in antiferromagnets

Prof. Dr. Sebastian Eggert
Fachbereich Physik, Technische Universität Kaiserslautern
Tel.: +49-631-205-2375
Fax: +49-631-205-3907
E-mail: eggert(at)

The study of phase transitions and strongly correlated
behavior with the help of coupled spin systems has a
long tradition ever since the proposal of the Ising
model. Modern research focuses on antiferromagnetic
model systems in order to understand the generic
behavior of a variety of quantum phase transitions and
more complicated order parameters, including
topological phases, supersolid phases, and spin-liquid
phases. Even though the spin degrees of freedom are
typically quite simplified, it is possible to tune the
interactions and fields in order to study the
universal signatures for a large range of strongly
correlated effects, which can then be generalized to
more realistic experimental setups.  Interacting spin
models are naturally closely related to interacting
bosonic systems in reduced dimensions, which are of
experimental relevance in the ultra-cold gases

Specific topics which are currently covered in this
project are for example: - The magnetocaloric effect
across phase boundaries - The role of frustration near
phase transitions - Exotic phases on triangular and
Kagome lattices

Methods include numerical simulations and field
theoretical calculations.  Active collaborations which
likely will result in common papers currently take
place with projects A5, A8, B1, B2, and B7.

Recent works (2013):

"Chiral edge states and fractional charge separation
in interacting bosons on a Kagome lattice" Xue-Feng
Zhang and Sebastian Eggert Phys. Rev. Lett. 111,
147201 (2013)

"Rydberg Polaritons in a Cavity: A Superradiant Solid"
Xue-Feng Zhang, Qing Sun, Yu-Chuan Wen, Wu-Ming Liu,
Sebastian Eggert, An-Chun Ji Phys. Rev. Lett. 110,
090402 (2013).


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