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Ultrafast
Phenomena in Correlated Electron Systems
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The objective of our research group is to study ultrafast
phenomena in correlated electron
systems excited with femtosecond optical pulses, and to apply and
develop new
real-time spectroscopic techniques for studying real-time dynamics of
electrons, lattice, spin and orbital degrees of freedom in these
technologically important correlated
electron materials*.
Recent projects:
"Energy-gap dynamics of superconducting NbN thin film studied by time-resolved teraherz spectroscopy" Phys. Rev. Lett. (2011).
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"Femtosecond Quasiparticle and Phonon Dynamics in Superconducting YBa2Cu3O7-d Studied by Ultrabroadband Terahertz Spectroscopy" Phys. Rev. Lett. (Aug. 2010).
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"Disentanglement of the electronic and lattice parts of the order
parameter in a 1D Charge Density Wave system probed by femtosecond
spectroscopy", Phys. Rev. Lett. (Aug. 2010)
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The focus of the research is -
but not limited to - on ultrafast studies of carrier dynamics in
superconductors, low dimensional
density wave compounds, and the investigation
of
transient photo-doping effects in Mott
insulators. The main idea of our research is to
determine the coupling strengths between various degrees of freedom
(spin,
electron, and lattice) in these materials and to determine the
characteristic
timescales of the phenomena as the important parameter for application
of these
materials in electronics.
The group is funded from the Sofja
Kovalevskaja Award of the Alexander
von Humboldt foundation.
Our research group
is embedded in a unique, vibrant research environment at University of Konstanz.
The research group
is participating in the Center
for Applied Photonics (CAP), an
interdisciplinary research network at the University of Konstanz
making the link between basic science in academia and applications of
novel photonics in industry.
We are also members
of and are supported by the Zukunftskolleg
of the University of Konstanz. Jure Demsar is a fellow of the Zukunftskolleg
since 11/2007, and Viktor Kabanov was awarded a Senior
Fellowship in Feb 2009.
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* Strongly correlated
materials are a wide class of
materials that show unusual (often technologically useful) electronic
and magnetic
properties, such as metal insulator transitions or half-metallicity.
Many, if not most, transition metal oxides belong into this class which
may be
subdivided according to their behavior, e.g. high Tc superconductors, spintronic materials, Mott
insulators, spin Peierls materials, heavy fermion
materials, quasi low-dimensional materials etc. The single most
intensively
studied effect is probably high temperature superconductivity
in doped cuprates,
e.g. La1-xSrxCuO4. Other ordering or
magnetic
phenomena and temperature induced phase transitions in many transition
metal
oxides are also gathered under the term strongly correlated materials.
(source
Wikipedia)
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