13.10.2016 17:30
KIP, INF 227, HS 1
Kolloquium der XXXVII. Heidelberger Graduiertentage - Hans Jensen Invited Lecture
Einstein predicted the existence of gravitational waves 100 years ago. They have been recently observed from merging binary Black Holes by the Laser Interferometer Gravitational-wave Observatory (LIGO).
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21.10.2016 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Clusters and nanoparticles often have properties rather different to those of the corresponding bulk
material, which is due to their
large surface-to-volume ratio and in general to quantum size effects,
the discretization of otherwise continuous densities of states. Especially the l
atter effect makes
them highly interesting candidates for the study of few to many particle physics. In
this
talk
the
intricate interplay between electronic and geometric structure in simple metal clusters
will be
discussed
, which has been clarified by a c
ombination of photoelectron spectroscopy on free, size-
selected alkali and noble metal clusters and DFT-calculations.
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28.10.2016 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Cavity-polaritons have emerged as an exciting platform for studying interacting bosons in a
driven-dissipative setting. Typically, the experimental realization of exciton-polaritons is based
on undoped GaAs quantum wells (QW) embedded in between two monolithic distributed Bragg
re ector (DBR) layers. Introduction of a degenerate electron gas either to the QW hosting
the excitons or a neighboring layer substantially enriches the physics due to polariton-electron
coupling. It has been proposed that such an interacting Bose-Fermi mixture can be used to
study polariton-mediated superconductivity in a two dimensional electron gas.
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4.11.2016 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Die Bundesregierung versucht, mit Hilfe von Solar-und Windenergie eine alternative
Stromversorgung zu Kernenergie und Kohleverstromung zu schaffen. Dazu dient das
„Erneuerbare-Energien-Gesetz EEG“ aus dem Jahre 2000. Hinzu kam der 2011 im
Eiltempo beschlossene Ausstieg aus der Nutzung der Kernenergie. Jetzt zeigt sich,
dass die „Wende“ große Risiken bei der Versorgungssicherheit, der Finanzierbarkeit,
den Auswirkungen auf die wirtschaftliche Entwicklung und die soziale Gerechtigkeit
birgt. Diese Wende droht an ihren Widersprüchen zu scheitern.
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11.11.2016 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
The
ab initio
description of excitations and dynamics in crystals, thin-
films molecules
and nano-materials becomes a real challenge when correlations lead to states with
large entanglement. At the same time many interesting phenomena are found when
local correlations and delocalization both play a role. In those materials one can find,
for example,
high-temperature superconductivity, colossal magnetoresistance, metal-insulator transitions,
and many more exotic properties. Nanoclusters, surfaces, and
interfaces provide us with the opportunity to combine and tune these fascinating
properties, obtaining novel functionalities. Transition
-metal ions with local correlations,
interacting with the delocalized orbitals of an organic molecule, are often found
as the
active center in enzymes and catalysts, as beautifully realized in nature with the active
role Mn atoms have in the fundamental process of photosynthesis.
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18.11.2016 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
The key component of nanoplasmonics is metals. When metal nanoparticles are placed in
close proximity,
the possibilities
for
shaping and controlling
near-field and far-field optical properties increase
enormously.
Near-field coupling between metal nanoparticles is extremely sensitive to nanometer conformational
changes. Such strong dependence on conformation provides unique opportunities in manipulating optical
response on the nanoscale. Simultaneously, it also raises significant challenges in realization of dynamic
plasmonic systems, which can exhibit immediate conformational
changes upon a regulated physical or
chemical control input.
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25.11.2016 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
The interaction of atoms with intense laser radiation leads to the generation of high-order harmonics of the laser field; in the time domain to a train of pulses in the extreme
ultraviolet range and with attosecond duration.
The short pulse duration and broad
bandwidth of attosecond pulses allow us to measure the phase and amplitude of
ionizing electron wave packets, thus sheding light on the dynamics of photoionization.
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2.12.2016 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
The Large Hadron Collider LHC has been operating at 13 TeV centre of mass since
2015 and the harvest of 2016 has surpassed all expectations.
The TeV-scale is now
probed in earnest. Some key results are presented;
they also motivate the plans for
the High-Luminosity LHC, the future European flagship project. First ideas for Physics
beyond Colliders complement the input to the Update of the European Strategy for
Particle Physics at the end of the decade.
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9.12.2016 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Wenn fast alles im Universum dunkel ist, worauf ein
ganzes Bündel
kosmologischer Messungen hinweist, wie können wir dann erfahren,
welche Strukturen aus dunkler Materie es im Universum gibt, wie sie
aufgebaut sind und wie sie sich unter dem Einfluss
dunkler Energie
entwickeln?
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16.12.2016 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Weihnachtskolloquium
Animal eyes range in size from fractions of a millimetre to as large as a basketball.
They serve a multitude of different visual tasks, and they do it under extremely varying
light conditions, from bright sunlight to starlight or the darkness of the deep sea. The
visual reality that we experience is specifically human.
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13.1.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Since the discovery of neutrino oscillation we know that neutrinos have non-zero
masses, but we do not know the absolute neutrino mass scale, which is as important
for cosmology as for particle physics. The direct search for a non-zero neutrino mass
from endpoint spectra of weak decays is complementary to the search for
neutrinoless
double beta-decay and analyses of cosmological data.
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20.1.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
27.1.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
In 1964, J. Bell discovered that the parts of a composite quantum system can
show
correlations that are stronger than any classical theory allows. The existence of these
Bell correlations has profound implications for the foundations of physics and at the
same time underpins a variety of quantum information technologies that are currently
being developed. While Bell correlations have been observed in systems of at most a
few (usually two) particles, their role in many-body systems is largely unexplored.
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3.2.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Gemeinsames Kolloquium mit Karlsruhe
The short wavelength of X-rays allows us to image structures at the atomic scale,
giving detailed pictures of biological
macromolecules.
However, X-ray radiation is
energetic enough to ionize matter: the very act of measurement destroys
the structure
being investigated.
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10.2.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Prof. Dr. Viatcheslav Mukhanov will discuss recent cosmic microwave background measurements and compare their
outcome with the theoretical predictions made more than 30 years ago.
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