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June 2018
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1 2 3
4
Roberto Merlin

from 11:00 to 12:00

5
Meredith Henstridge

from 11:30 to 12:30

6
Roberto Merlin

from 11:00 to 12:00

Adriana Palffy

from 14:00 to 15:00

7
Amit Ribak

from 09:30 to 10:30

8 9 10
11 12 13
Kai Karin Geschuhn

from 10:00 to 12:00

14 15 16 17
18
Andreas J. Heinrich

from 14:30 to 15:30

19 20
Kota Katsumi

from 11:00 to 12:00

Christoph Matthias Testud

from 14:00 to 16:00

21 22
Hideo Aoki

from 11:00 to 12:00

23 24
25 26 27 28 29
Hideo Aoki

from 11:00 to 12:00

30

News

Events

Here you can find upcoming events of the MPSD institute.

MPSD Seminar

14320 1528463795

Quantum Nanoscience: Atoms on Surfaces

The scanning tunneling microscope is an amazing tool because of its atomic-scale spatial resolution. This can be combined with the use of low temperatures, culminating in precise atom manipulation and spectroscopy with microvolt energy resolution. In this talk we will apply these techniques to the investigation of the quantum spin properties of magnetic atoms sitting on thin insulating films. [more]

MPSD Seminar

Higgs mode in the d-wave cuprate superconductor Bi2Sr2CaCu2O8+δ induced by an intense THz pulse

The nonequilibrium dynamicis of the superconductors has been intensively studied over decades. Among the viriety of nonequlibrium phenomena, the study of the collective dynamics of superconducting order parameter is of essential importance, as it provides deep insights into the properties of the order parameter. Recent developments of generating intense electromagnetic pulses in the terahertz (THz) frequency range have enabled the access to low energy collective modes without giving excess energy to the system. Particularly the amplitude fluctuation of the order parameter, referred to as the Higgs mode, has been observed in a conventional s-wave superconductor Nb1-xTixN [1,2]. Its extension to unconventional d-wave superconductors is intriguing, whereas it has been nontrivial whether the Higgs mode in d-wave superconductors is observable or not. [more]

MPSD Seminar

Superconductivity in single- and multi-band Hubbard models: can we optimise them?

We can capture various unconventional high-Tc superconductors basically either with single-band models or multiband ones. We can theoretically explore how we can optimise them for higher Tc's. There, "multiband" should not be confused with "multiorbital" systems, for which I shall compare merits and demerits of the two classes from both quantum many-body algorithms and materials-science points of view. For the former, I shall mention the dynamical vertex approximation to fathom the correlation between the electronic structure and the superconductivity and to search for enhanced Tc's. For the latter, I shall present various ideas that include "flat-band" superconductivity. [more]

MPSD Seminar

Higgs modes in d-wave and multi-band superconductors

Higgs mode (collective amplitude mode) in superconductors, recently detected and analysed in a conventional, s-wave superconductor, opens a novel avenue for probing the U(1) symmetry broken state. Now we have extended the notion to an unconventional, d-wave high-Tc cuprate, where a characteristic third-harmonic generation hallmarks the d-wave superconductor in a space-group resolved manner[1]. We can also predict unique features in Higgs and Leggett (phase) modes if we turn to multiband superconductors[2].[1] K. Katsumi et al, PRL 120, 117001 (2018).[2] Y. Murotani et al, PRB 95, 104503 (2017). [more]

 
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