Seminars, Colloquia & Meetings

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Please note: The entries in this list appear currently in reverse chronological order.

Jun 16, 2017

D-PHYS - Masterfeier / Graduation ceremony


- ETH Zürich, Zentrum HG F 30 - Fri 16.06.2017 17:00-19:00

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Jun 5, 2017

D-PHYS - Pfingstmontag / Whit Monday


- ETH Zürich, Hönggerberg - Mon 5.06.2017 8:00-18:00

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Jun 2, 2017

D-PHYS - Ende Frühjahrssemester 2017 / End of Spring Semester 2017


- ETH Zürich, Hönggerberg - Fri 2.06.2017 18:00

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Jun 2, 2017

D-PHYS (members only) - Departements- und Professorenkonferenz


- ETH Zürich, Hönggerberg HPH G 1 - Fri 2.06.2017 14:00-18:00

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Jun 2, 2017

D-PHYS (members only) - PK-Lunch


- ETH Zürich, Hönggerberg HIT E 51 - Fri 2.06.2017 12:00-13:30

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May 29, 2017

Oded Zilberberg (ETH Zürich) - Electronic and Photonic quantum engineered systems


- ETH Zürich, Zentrum HG F 30 - Mon 29.05.2017 17:15

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May 25, 2017

D-PHYS - Auffahrt / Ascension Day


- ETH Zürich, Hönggerberg - Thu 25.05.2017 8:00-18:00

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May 22, 2017

D-PHYS (members only) - Ausschuss


- ETH Zürich, Hönggerberg HIT E 41.1 - Mon 22.05.2017 13:00-18:00

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May 17, 2017

Colin A. Norman (Dept. of Physics & Astronomy, John Hopkins University, Baltimore, USA) - The Formation, Evolution and Environments of Active Galaxies

Active galaxies host billion solar masses central black holes, whose impact on galaxies and structure on super-galactic scales is still unknown. I will discuss formation and evolution of low- and high-redshift active galaxies with emphasis on environments where feedback effects become important. In the light of new simulations and data, I will also examine the relation between starbursts and activity in galaxies and the underlying physics of multi-phase media in these extreme conditions.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 17.05.2017 16:15

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May 16, 2017

D-PHYS (members only) - Unterrichtskommission


- ETH Zürich, Zentrum - Tue 16.05.2017 15:15

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May 16, 2017

D-PHYS (members only) - Betriebskommission der Betriebe D-PHYS


- ETH Zürich, Hönggerberg HPF G 6 - Tue 16.05.2017 9:00-11:00

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May 10, 2017

Federico Capasso (School of Eng. & Applied Sciences, Harvard University, Cambridge, USA) - Metaoptics

Metasurfaces based on sub-wavelength patterning have major potential for arbitrary control of the wavefront of light by achieving local control of the phase, amplitude and polarization and allowing greater functionality and more compact devices. High performance metalenses for the visible, achromatic lenses, axicons, vortex plates, holograms, ultracompact spectrometers and polarimeters will be discussed along with the potential of this technology for a wide range of applications.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 10.05.2017 16:15

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May 3, 2017

Department of Physics, University of Konstanz, Konstanz, Germany (CERN, Geneva & Université catholique de Louvain, Louvain, Belgium) - From Pure Mathematics to Precision Physics: Modern Approaches to Scattering Amplitudes

The computation of quantum corrections to scattering processes has for a long time been hampered by the complexity of the integrals involved. In recent years there was tremendous progress in this area, partly due to the discovery of deep connections between scattering amplitudes and certain branches of pure mathematics. I will review these connections and discuss how they can be turned into new powerful tools for precision computations.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 3.05.2017 16:15

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May 1, 2017

D-PHYS - Tag der Arbeit / Labour Day


- ETH Zürich, Hönggerberg - Mon 1.05.2017 8:00-18:00

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Apr 27, 2017

George Jackeli (MPI, Stuttgart, Germany) - Spin-orbit entanglement in Mott insulators with strong relativistic coupling: Unusual interaction and novel phases


- ETH Zürich, Hönggerberg HPF G 6 - Thu 27.04.2017 16:45-18:00

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Apr 27, 2017

Marco Hutter (IRIS, ETHZ) - Legged robots – the future of all-terrain mobility

Legged robotics is the future when it comes to versatile machines that can move across any terrain. In contrast to classical wheeled or tracked vehicles, they have the potential to move with unperceived agility and grace. In this talk, I will give an insight into our work on legged robots that are used in the field for autonomous inspection and exploration. This includes novel compliant actuators that enable dynamic interaction, model based control algorithms to balance the machine in dynamic gaits, and optimization tools to learn motion trajectory and feedback control parameters. Moreover, I will show how these machines can perceive their environment to localize themselves and to create accurate maps of the surrounding. An overview about our work and the newest robot ANYmal is available on www.rsl.ethz.ch and on our youtube channel: www.youtube.com/leggedrobotics
- ETH Zürich, Zentrum HG E 5 - Thu 27.04.2017 16:15

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Apr 26, 2017

Sebastiano Cantalupo (ETH Zurich) - Illuminating the Dark Universe with the help of supermassive black holes


- ETH Zürich, Zentrum HG F 30 - Wed 26.04.2017 17:15

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Apr 24, 2017

D-PHYS - Sechseläuten / "Sechseläuten" (Zurich spring festival)


- ETH Zürich, Hönggerberg - Mon 24.04.2017 12:00-18:00

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Apr 21, 2017

D-PHYS - Promotionsfeier / Doctorate awards ceremony


- ETH Zürich, Hönggerberg HPH G 1 - Fri 21.04.2017 17:00

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Apr 17, 2017

D-PHYS - Ostermontag / Easter Monday


- ETH Zürich, Hönggerberg - Mon 17.04.2017 8:00-18:00

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Apr 14, 2017

D-PHYS - Karfreitag / Good Friday


- ETH Zürich, Hönggerberg - Fri 14.04.2017 8:00-18:00

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Apr 12, 2017

Ulrich Straumann (University of Zurich) - Der Cherenkov-Teleskop-Array

Der Cherenkov- Teleskop-Array (CTA) ist ein Projekt zur Beobachtung von hochenergetischen Gammastrahlen aus dem Weltall. Um Photonenenergien über vier Dekaden von einigen 10 GeV bis 100 TeV zu analysieren, wird die existierende Cherenkov-Technik einzelner Teleskope auf über 100 solche er- weitert, die an zwei Standorten auf der Nord- und Südhalbkugel aufgebaut werden sollen. Damit wird auch die Energie- und Positionsauflösung stark verbessert. Der Vortrag versucht eine Übersicht über die Messtechnik und die organisatorischen und politischen Herausforderungen zu geben und die astro- und teilchenphysikalischen Fragestellungen zusammenzufassen.
- ETH Zürich, Zentrum HG G 5 - Wed 12.04.2017 19:30

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Apr 12, 2017

Tom Abel (Kavli Inst. Particle Astrophys. & Cosmology, Stanford University, USA) - Making Sense of the Universe with Supercomputers

In computational cosmology we face complex multi-scale and multi-physics problems. Algorithmic advances have enabled ever more realistic numerical models of a wide range of astrophysical objects. We describe and show results from adaptive mesh refinement simulations capturing 15 orders of magnitude in length scale, adaptive ray tracing for radiation hydro-dynamics, and a new noise-free approach to solve the collision-less Boltzmann equation.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 12.04.2017 16:15

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Apr 12, 2017

Jerry Feldman (D-PHYS, ETH Zurich) - SCALE-UP


- ETH Zürich, Hönggerberg HPF G 6 - Wed 12.04.2017 14:00-16:30

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Apr 12, 2017

James Bonifacio (University of Oxford, UK) - Constructing and constraining massive spin-2 scattering amplitudes

I will first review a procedure for constructing tree-level scattering amplitudes for spinning particles. Considering the case of a self-interacting massive spin-2 particle, I show that the four-point amplitudes with the highest cutoff correspond to the known ghost-free massive gravity theories, even allowing for arbitrary derivative interactions and parity-odd terms. This demonstrates that $\Lambda_3$ is a model-independent bound on the strong coupling scale in effective theories of a self-interacting massive spin-2 field. I also remark on possible generalisations to higher spins and additional fields. Lastly, I will discuss how the scattering amplitudes of massive spin-2 theories are constrained by analytic dispersion relations, assuming the existence of a UV-completion that satisfies the usual S-matrix analyticity conditions.
- ETH Zürich, Hönggerberg HIT E 41.1 - Wed 12.04.2017 14:00

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Apr 12, 2017

Yigal Meir (Ben-Gurion University of the Negev, Israel) - Spontaneous Breakdown of Topological Protection in Two Dimensions


- ETH Zürich, Hönggerberg HPF E 6 - Wed 12.04.2017 11:00

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Apr 12, 2017

Yigal Meir (Ben Gurion University, Israel) - Spontaneous Breakdown of Topological Protection in Two Dimensions


- ETH Zürich, Hönggerberg HPF E 6 - Wed 12.04.2017 11:00

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Apr 7, 2017

D-PHYS (members only) (D PHYS, ETH Zürich) - aoPK SNF Professorship


- ETH Zürich, Hönggerberg HIT E 41.1 - Fri 7.04.2017 13:00-19:00

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Apr 6, 2017

Dev Sinha (University of Oregon, Eugene, USA) - A program to construct integer-valued finite-type knot invariants

Using techniques closely related to his celebrated work in deformation theory, Kontsevich constructed an explicit, geometric universal Vassiliev invariant over the real numbers (or by deep results, over the rational numbers). Vassiliev invariants over the integers are far from settled. We outline a program to investigate them using the Goodwillie-Weiss tower for the embedding functor. We recently showed this tower has needed structure and provided spectral sequence evidence for the conjecture that the tower serves as a universal finite-type invariant over the integers. We have also developed Hopf invariants for homotopy groups and now more general mapping sets, which have the potential to detect components of the tower. We describe these two lines of progress and then ideas for next steps.
- ETH Zürich, Zentrum HG G 43 - Thu 6.04.2017 15:15

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Apr 5, 2017

Elke Scheer (Department of Physics, University of Konstanz, Germany) - Atomic Scale Functional Devices

Fabricating electronic devices with functional units of atomic size is a major driving force of nanotechnology. Key elements in microelectronics include switches and small magnets that both can be operated as memory devices. Here I will show that an atomic-size contact can be operated as reliable two-terminal switch. I will then address the emergence of magnetism at the atomic scale and how it can be revealed by magnetotransport measurements.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 5.04.2017 16:15

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Apr 5, 2017

Harald Ita (University Freibug, Germany) - First Two-Loop Amplitudes with the Numerical Unitarity Method


- ETH Zürich, Hönggerberg HIT E 41.1 - Wed 5.04.2017 14:00

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Apr 5, 2017

Ali Seraj (IPM - Institute for Research in Fundamental Sciences, Tehran, Iran) - Multipole charges in electrodynamics and the vacuum moduli space

We introduce multipole charges as the Noether charges associated with a subclass of gauge symmetries of Maxwell theory. We show that in a static configuration, these charges are proportional to the electric multipole moments which uniquely specify the system. Moreover, the conservation laws impose infinite number of constraints over the radiation in electrodynamics. The presence of multipole symmetries implies that the vacuum of gauge theory is not unique, but instead an infinite dimensional moduli space, the adiabatic motion on which generates well known solutions of the theory.
- ETH Zürich, Hönggerberg HIT E 41.1 - Wed 5.04.2017 14:00

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Apr 5, 2017

Florian Adolphi (University Lund, Sweden & University Bern) - Assessing and improving the radiocarbon and ice core timescales - insights from cosmogenic radionuclides


- ETH Zürich, Hönggerberg HPK D 24 - Wed 5.04.2017 11:00

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Apr 4, 2017

Benedict von Harling (DESY, Hamburg, Germany) - Cosmological evolution of Yukawa couplings from warped space


- ETH Zürich, Hönggerberg HIT E 41.1 - Tue 4.04.2017 11:15

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Apr 3, 2017

Tatiana Kovalevich (FEMTO-ST Institute, Besançon, France) - Tunable Bloch surface waves devices

Bloch surface waves (BSWs) are recently developing alternative to surface plasmon polaritons. These surface states can be excited at the interface between periodic dielectric multilayer and a surrounding medium. They perform high quality factor and can be excited both by TE or TM polarized light. Due to dramatically enhanced propagation distance and strong field confinement these surface states can be successfully used in on-chip all-optical integrated devices of increased complexity as well as in biomedical field for fluorescence detection, imaging, vapor sensing, etc. During the talk several approaches to achieve the tunability of BSWs will be discussed. We will take in consideration different coupling methods and the influence of materials of the multilayer on the behavior of the whole one-dimensional photonic crystal. For example, we will study the use of crystalline thin films of LiNbO3 in BSW based integrated optics.
- ETH Zürich, Hönggerberg HPF G 6 - Mon 3.04.2017 16:45-18:00

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Mar 31, 2017

Sarah Houver (Ecole Normale Supérieure de Paris, France) - Resonant nonlinear optics in quantum cascade lasers

Since the development of lasers in the 1960s, nonlinear optics with near infrared (NIR) beams has been widely explored thanks to these powerful and coherent sources. In the terahertz (THz) and Mid-Infrared (MIR) domains from 5 μm to 100 μm (3 meV to 200 meV), the lack of reliable sources has strongly limited investigations on THz nonlinear optics experiments. At the end of 1990s, the first THz nonlinear experiments demonstrated nonlinear frequency mixing1 between a NIR beam and a THz beam from a Free Electron Laser (FEL). Quantum Cascade Lasers (QCL) are compact powerful laser sources, operating throughout the MIR and THz regions. They are based on nanometric semiconductor layers and rely on intersubband transitions in semiconductor quantum wells. Since their first demonstration in 1994 for MIR QCLs2 and in 2002 for THz QCLs3, the performances of these devices have increased dramatically. Their intracavity powers can approach today those used in FELs. These developments are promising for the application of QCLs to THz nonlinear optics experiments and to study the interaction of strong THz fields with condensed matter systems. In this seminar, I will present THz nonlinear optics studies4, using QCLs simultaneously as sources for THz radiation as well as the nonlinear medium. We show how the optical nonlinearities of the system can be significantly enhanced through interband resonant excitations, permitting the generation of THz sidebands without considerations of phase matching. These experiments have been recently extended to MIR QCLs5, excitation wavelengths in the telecom range, and sideband generation up to room temperature. This paves the way for potential applications of resonant nonlinearities to optical wavelength shifting and ultrafast modulation transfer for telecommunications.
- ETH Zürich, Hönggerberg HPF G 6 - Fri 31.03.2017 14:00-16:00

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Mar 31, 2017

Michael Böhlen (University of Zurich) - On the Partitioning of Intervals


- UZH Irchel Y36 K 08 - Fri 31.03.2017 10:45

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Mar 30, 2017

Beat Jeckelmann (METAS, Bern-Wabern) - Naturkonstanten als Grundlage für das revidierte Internationale Einheitensystem SI

Das Internationale Einheitensystem (SI) ist heute die weltweit verbindliche Basis für das Messen. Um den steigenden Anforderungen an die Genauigkeit von Messungen genügen zu können, muss das System periodisch weiter entwickelt werden. Voraussichtlich im Herbst 2018 wird die Generalkonferenz für Mass und Gewicht eine grundlegende Modernisierung des SI beschliessen. Das neue SI basiert auf sieben exakt festgelegten physikalischen Konstanten. Ausgehend von diesen Konstanten können alle Einheiten des Systems, sowohl Basis- als auch abgeleitete Einheiten, mit Hilfe der physikalischen Gesetze konstruiert werden. Dies gilt auch für die Einheit der Masse, das Kilogramm, die heute noch durch eine Massverkörperung, den Internationalen Kilogrammprototyp (Urkilogramm) in Paris, definiert ist.
- ETH Zürich, Zentrum HG G 5 - Thu 30.03.2017 19:30

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Mar 30, 2017

Richard Steinacher (D-PHYS, ETH Zurich) - Can electron flow be imaged?


- ETH Zürich, Hönggerberg HIT F 11.1 - Thu 30.03.2017 17:00-19:00

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Mar 30, 2017

Robert Seiringer (Institute of Science and Technology, Klosterneuburg, Austria) - A program to construct integer-valued finite-type knot invariants

We present a proof that a system of N fermions interacting with an additional particle via point interactions is stable if the ratio of the mass of the additional particle to the one of the fermions is larger than some critical m∗. The value of m∗ is independent of N and turns out to be less than 1. This fact is of relevance for the stability of fermionic gases in the unitary limit. We also present a rigorous version of the Tan relations valid for all wave functions in the domain of the Hamiltonian of this model.
- ETH Zürich, Zentrum HG G 43 - Thu 30.03.2017 15:15

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Mar 29, 2017

Piet O. Schmidt (QUEST Inst., PTB, Braunschweig & Leibniz University, Hannover, Germany) - Quantum Logic Spectroscopy of Trapped Ions

Precision spectroscopy is a driving force for the development of our physical understanding and novel applications in quantum sensing and optical clocks. However, only few atomic and molecular systems of interest have been accessible to precision spectroscopy in the past. This restriction can be overcome in quantum logic spectroscopy by combining the features of two ion species using techniques from quantum computing.
- ETH Zürich, Hönggerberg HPV G 4 - Wed 29.03.2017 16:15

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Mar 29, 2017

Marc Magro (ENS Lyon, France) - The twist function of an integrable sigma-model

I shall review the relevance of the twist function for a whole family of integrable sigma-models. In particular, I will show how this function is related to the computation of both local and non-local conserved charges.
- ETH Zürich, Hönggerberg HIT E 41.1 - Wed 29.03.2017 14:00

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Mar 29, 2017

Olivia Kronig (ETH Zürich) - Using 10Be to date the stablisation age of relict rockglaciers


- ETH Zürich, Hönggerberg HPK D 24 - Wed 29.03.2017 11:00

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Mar 28, 2017

Jürg Fröhlich (ETH Zürich) - The Statistical Mechanics of the Universe

After some apologies, I attempt to summarize and discuss some fundamental puzzles in cosmology. I then review a few basic facts about the geometry of the Universe and about its statistical mechanics and thermodynamics. Particular attention is paid to conservation laws related to (approximately) conserved currents and chemical potentials conjugate to conserved quantities. As a first application of the general formalism, I describe a mechanism that may lead to the generation of cosmic magnetic fields. I then turn to a discussion and critique of a model of (fuzzy) dark matter recently discussed in the literature. In this context I draw attention to some gravitational instabilities. The talk will end with speculations concerning the nature of Dark Energy and with some concluding observations on cosmology by an outsider and dilettante.
- ETH Zürich, Hönggerberg HIT H 42 - Tue 28.03.2017 16:15

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Mar 28, 2017

Simon Badger (University of Durham, UK) - Local integrands for two-loop amplitudes


- ETH Zürich, Hönggerberg HIT E 41.1 - Tue 28.03.2017 11:15

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Mar 28, 2017

R. Eichler (Paul Scherrer Institut, Villigen) - Superheavy element chemistry


- PSI Area Ost OSGA EG 06 - Tue 28.03.2017 11:00

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27.03.2017
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