Host: Martin Wolf

The discovery and applications of topological quasiparticles by ultrafast microscopy

  • PC Department Online Seminar
  • Date: Oct 19, 2021
  • Time: 11:00 AM (Local Time Germany)
  • Speaker: Prof. Hrvoje Petek
  • University of Pittsburgh
  • Host: Martin Wolf
Surface plasmon polaritons (SPP) are composite electromagnetic field-charge density wave collective modes that propagate at metal/dielectric interfaces at the local speed of light. The circulation of their fields from transverse to longitudinal causes a transverse spin angular momentum (SAM) locking known as quantum spin-Hall effect, which embodies the property of evanescent waves, such as SPPs, that changing the sign of the photon momentum direction changes the sign of its spin. In other words, the oppositely propagating SPP waves possess the opposite spin. SPP fields can also carry optical angular momentum (OAM), which can focus them into plasmonic vortices. [more]

On-Surface Chemistry of Helicenes

  • Department Online Seminar
  • Date: May 2, 2022
  • Time: 11:00 AM (Local Time Germany)
  • Speaker: Karl Heinz Ernst
  • EMPA, Dübendorft, Switzerland
  • Host: Martin Wolf
Surfaces functionalized with helicenes are of interest for chiroptical electronic devices or for electron-spin filtering. While self-assembled layers facilitate studying interesting phenomena, covalently linked chiral modified materials would be much more robust and therefore better suited for applications. [more]

Water Flows in Carbon Nanochannels, from Carbon Memories to Quantum Friction

The emerging field of nanofluidics explores the molecular mechanics of fluids. This world of infinitesimal fluidics is the frontier where the continuum of fluid dynamics meets the atomic nature of matter, or even its quantum nature. Nature fully exploits the fluidic oddities at the nanoscale and it is capable of breath-taking technological feats using a fluidic circuitry made of multiple biological channels, such as ionic pumps, proton engines, ultra-selective pores, stimulable channels, ... [more]

Chemical dynamics at extended scales

Chemical dynamics at extended scales
  • Start: Jan 10, 2023 09:00 AM (Local Time Germany)
  • End: Jan 11, 2023 06:00 PM
  • Location: Harnack House
  • Host: Martin Wolf
The Fritz Haber Institute of the Max Planck Society, in short FHI, is an international research place where scientists from all over the world investigate the basic principles underlying the chemical conversion of matter and energy at surfaces and interfaces. Our institute was celebrating the 110th anniversary of its inauguration this October and we are also approaching a generation change with the upcoming retirements of three directors (Schlögl, Wolf, and Meijer) in the coming years. This is an excellent moment to further develop the institute’s strategy and research concept, and to identify the upcoming fields for the next decades in physical chemistry and chemical physics in Berlin-Dahlem. [more]

Theory of Higgs Spectroscopy: How to Activate and Detect the Higgs Mode

  • PC Department Seminar
  • Date: Sep 27, 2023
  • Time: 11:00 AM (Local Time Germany)
  • Speaker: Dirk Manske
  • Max Planck Institute for Solid State Research, Stuttgart
  • Location: Building G
  • Room: 2.06
  • Host: Martin Wolf
Higgs spectroscopy is a new and emergent field that allows to classify and determine the superconducting order parameter by means of ultra-fast optical spectroscopy. There are two established ways to activate the Higgs mode in superconductors, namely a single-cycle ‘quench’ or an adiabatic, multicycle ‘drive’ pulse. [more]

Single-molecule imaging and engineering of biological and synthetic molecular motors

  • PC Department Seminar
  • Date: Nov 30, 2023
  • Time: 11:00 AM (Local Time Germany)
  • Speaker: Ryota Iino
  • Institute for Molecular Science, National Institutes of Natural Sciences, Japan
  • Location: Building G
  • Room: 2.06
  • Host: Martin Wolf
Molecular motors, an important class of molecular machines, harness various energy sources to move unidirectionally [1]. The operational principles of molecular motors are distinct from those of man-made macroscopic motors, because they have nanoscale dimensions and generally work in a solution environment where viscosity is dominant. Under these low Reynolds number, overdamped conditions, they cannot rely on inertia to sustain motion. Furthermore, they are continually agitated by random Brownian motion, which provides both challenges and opportunities for the unidirectional motion. [more]

Workshop on “Emerging Techniques of Nanospectroscopy Based on Scanning Probe Microscopy"

[more]

Exploring and Manipulating Materials with Ultrafast Linear and Nonlinear Scattering and Spectroscopy Techniques

Our group specializes in ultrafast spectroscopic methods, enabling in-depth studies of material chemistry in intricate environments and the control of quantum phenomena on femtosecond timescales. In the first part of this seminar, I will discuss the role of lithium in various systems from its contribution to symmetry breaking (LiNbO3), to an exotic quantum material (polar metal LiOsO3), to unravel the reasons behind the low hopping rate of lithium ions at the surface of a solid-state electrolyte (LixLa(2-x)/3TiO3). All these systems share the common feature that Li occupies a symmetry-broken state which we can selectively probe using extreme-ultraviolet second-harmonic generation spectroscopy (XUV-SHG), a novel spectroscopy pioneered in my group. In the second part I will discuss recent results on 1T-TiSe2, a prototypical charge-density-wave (CDW) compound that also exhibits strong excitonic correlations in its low-temperature phase. [more]

Correlated Motions of Electrons, Spins, and Dipoles in 2D vdW Materials

Correlation plays a central role in emergent phenomena. Examples include, among others, quantum ground states and collective excitations. Here, I will discuss what we can learn from time-domain views of correlation in two dimensional (2D) vdW materials. In the 2D vdW magnetic semiconductor, CrSBr, excitonic transition is found to strongly couple to magnetic order [1] and this allows the easy detection of low energy (GHz-THz) magnons by visible-NIR light [2]. [more]
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