12.4.2017 17:30
KIP, INF 227, HS 1
Kolloquium der XXXVIII. Heidelberger Graduiertentage - Hans Jensen Invited Lecture
21.4.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
We have known for twenty years that quantum computers would have unique powers
for solving certain classes of computational problems. Throughout these twenty years,
workers have striven to identify a physical setting in which high-quality qubits can be
created and employed in a quantum computing system. Very promising devices have
been identified in several different areas of low-temperature electronics, namely in
superconductor and in single-electron semiconductor structures (e.g., quantum dots).
Rudimentary efforts at scale-up are presently reported; even for modules of 10 qubits,
the complexity of the classical electronic control system becomes one of the main
barriers to further progress.
mehr...
28.4.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Entanglement is a counterintuitive feature of quantum mechanics, which implies that
a measurement of one particle can instantaneously determine the state of another
well-separated particle. Remarkably, quantum entanglement can also happen en
masse, and determines observable properties of macroscopic objects.
mehr...
5.5.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
At the outskirts of the solar system, beyond the orbit of Neptune, lies an expansive field
of icy debris known as the
Kuiper belt. The orbits of the individual asteroid-
like bodies
within the Kuiper belt trace out highly elongated elliptical paths, and require hundreds
to thousands of years to complete a single revolution around the Sun. Although the
majority of the Kuip
er belt’s dynamical structure can be understood within the
framework of the known eight-planet solar system, bodies with orbital periods longer
than about 4,000 years exhibit a peculiar orbital alignment that eludes explanation.
mehr...
12.5.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
The theory of complex variables is extremely useful because it
helps to explain the mathematical behavior of functions of a real variable.
Complex variable theory also provides insight into the nature of physical
theories.
mehr...
19.5.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Atmospheric nuclear weapon testing during the cold war in the 1950s and 1960s has been worrying,
though including
a unique beneficial aspect in
the area of environmental sciences. The artificial
nuclear production of more than 6 x 10
28
atoms or about 1.4 tons of
14C led to a doubling of the
14C/C
ratio in tropospheric CO
2
of the Northern Hemisphere. The
prominent so-called bomb spike peaking
in 1963 can be used as transient tracer
to understand carbon dynamics in the
Earth System.
mehr...
26.5.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Strong coupling of light and matter can give rise to a multitude of exciting physical effects through the formation of
hybrid light-matter states.
When
molecular materials with high transition dipole mo
ments are placed in the confined
fields of metallic microcavities or surface plasmons, Rabi splittings approaching 1 eV are observed due to the
interaction with the vacuum electromagnetic field.
This leads
to fundamental changes in the properties of the
coupled system, especially
in the ultra-strong coupling regime.
mehr...
2.6.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Recent developments in diverse areas
- ranging from cold atomic gases over light-driven semiconductors to microcavity arrays -
move systems into the focus, which are
located on the interface of quantum optics, many
-body physics and statistical
mechanics. These driven open quantum systems share in common that coherent and
driven-dissipative quantum dynamics occur on an equal footing, placing them far away
from thermodynamic equilibrium.
mehr...
9.6.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Medical physics (also called
biomedical physics, medical biophysics or applied
physics in medicine) is, generally speaking, the application of physics concepts,
theories and methods to medicine or healthcare. Medical physics departments may be
found in hospitals or universities. There are 4 main areas of medical physics specialty
1) medical imaging physics, 2) radiation therapeutic physics, 3) nuclear medicine
physics and 4) health physics, which cover more that 90% of all medical physics
activities.
mehr...
16.6.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Die
schwersten Elemente verdanken ihre
Existenz
nuklearer Schaleneffekte, die ihnen
erhöhte
Stabilität
gegen
spontane
Kernspaltung
verleihen. Theoretische
Modelle sagen
eine
Insel der
Stabilität
superschwerer
Eleme
nte
mit
Z≈114
und
N≈ 184
vorher. Dieser Bereich ist experimentell
aktuell allerdings nicht zugänglich.
mehr...
23.6.2017 17:00
Prof. Dr. Karl Leo, Integrated Center for Applied Physics and Photonic Materials (IAPP) and Institute for Applied Physics, Technische Universität Dresden KIP, INF 227, Otto-Haxel-Hörsaal
Organische Halbleiter eröffnen neuartige Anwendungsmöglichkeiten für flexible, leichte, und
umweltreundliche elektronische Bauelemente. Trotz erster Anwendungserfolge, z.B. in
OLED-Displays, sind fundamentale Materialeigenschaften nur wenig verstanden. In diesem
Vortrag stelle ich die Materialklasse der organischen Halbleiter vor und zeige am Beispiel
von organischen Solarzellen, welche Herausforderungen die Materialforschung beinhaltet.
mehr...
30.6.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Ultra-High Energy Cosmic Rays (UHECR) are
charged particles with energies reaching to
beyond 10
20 eV. Still, 50 years after first successful observations, only very little is known
about their nature, their sources and their location in the Universe, and about the
mechanism by which they receive such enormous energies. The Pierre Auger Observatory
located near the Andes mountains in Argentina has been conceived to address these
questions. It covers an area of 3000 km
2, which makes it the world’s largest cosmic ray
observatory, and comprises an array of 1660 particle detectors and a set of 27 large area
fluorescence telescopes.
mehr...
7.7.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Owing to the favorable physical and biological properties of swift
ions in matter, their
application to radiation
therapy for highly selective tumour treatment
is rapidly
spreading
worldwide. To date
about
70 ion therapy facilities are
treating patients,
predominantly with proton beams, and about the same amount is
under construction or planning. In Germany, already
3 proton therapy facilities and 2 combined proton and
carbon ion beam therapy centers
are
operational.
mehr...
14.7.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Usually, crystals have three-dimensional periodicity. Smectic liquid crystals, however,
have one-dimensional order, even in three-dimensional samples. These systems, as
simple as they might seem, connect the physics of biomembranes, superconductivity,
and even special relativity. I will provide an introduction for non-specialists and show
how this diverse set of ideas comes together in these very, very soft systems.
mehr...
21.7.2017 17:00
KIT, Campus Süd, Gaede-Hörsaal, Physik-Flachbau (Geb. 30.22)
Gemeinsames Kolloquium mit Karlsruhe, anschließend Empfang im Gastdozentenhaus „Heinrich Hertz“
Optical microcavities are a powerful tool to enhance light-matter interactions. Consisting of
microscopic reflective boundaries, they can concentrate, filter, and store light in wavelength-scale
volumes. This enables applications ranging from spectroscopy and sensing to quantum information.
To achieve large cavity enhancement on an accessible platform, we have developed
microscopic
Fabry-Perot cavities based on laser-
machined optical fibers.
mehr...
28.7.2017 17:00
KIP, INF 227, Otto-Haxel-Hörsaal
Perfect diamond is transparent for visible light but there are famous diamonds, such
as the famous Oppenheim Blue
or the Pink Panther worth tens
of millions of dollar,
which have intense colour. An important source of colour in diamond are lattice defects
which emit and absorb light at optical frequencies and may indeed possess a non-vanishing ground state electronic spin.
mehr...