Kiel Nano, Surface and Interface Science (KiNSIS)

Dates and Events

Lattice, correlations and order: Controlling (with) Dirac fermions (Prof. Tim Wehling, University of Hamburg)

Nov 30, 2021 from 04:15 PM

Hybrid, Physikalisches Kolloquium

WehlingThe interplay of electronic correlations, lattice degrees of freedom and topology holds the promise for the realization of exotic states of quantum matter. Here, we discuss how to disentangle and how to control this interplay on the atomic scale. We will first address doping fingerprints of superconductivity arising from spin and lattice fluctuations in moiré superlattice systems [1]. We will show how confinement and deconfinement present pathways to create and control correlated Dirac fermions via superlattice engineering [2]. In turn, we show how in turn “Diracness” can control the spontaneous emergence of superlattices in charge density wave compounds [3].

[1] N. Witt, J. M. Pizarro, T. Nomoto, R. Arita, T. O. Wehling, arXiv:2108.01121 (2021)
[2] J. M. Pizarro, S. Adler, K. Zantout, T. Mertz, P. Barone, R. Valentí, G. Sangiovanni, T. O. Wehling, npj Quantum Materials 5, 79 (2020)
[3] J. Berges, E. G. C. P. van Loon, A. Schobert, M. Rösner, and T. O. Wehling, Phys. Rev. B 101, 155107 (2020)

The hybrid talk is part of the Physikalisches Kolloquium of the department of physics of Kiel University. Everybody interested is cordially invited: Geiger Lecture Hall (Leibnizstraße 15), Kiel or www.physik.uni-kiel.de/de/veranstaltungen/physikalisches-kolloquium

Fabio Caruso

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Controlled release with nanosized drug delivery systems: concepts and performance (Karsten Mäder, Universität Halle, Pharmaceutical Technology)

Dec 01, 2021 from 12:00 PM to 01:00 PM

Online, KiNSIS Colloquium

KiNSIS LogoDrug delivery systems (DDS) can improve improve drug therapy by increasing the delivery efficacy to the desired tissue and decreasing the side effects. DDS cover a wide range of different materials (e.g. polymers, lipids, phospholipids) and sizes (implants, microparticles, nano-DDS). Controlled drug release requires to control drug delivery with respect to the location and release kinetics. Different principles to control drug delivery (e.g. diffusion, erosion, stimulus sensitive) will be explained and the size dependency of the dominating release mechanism will be discussed. Achievements and challenges will be discussed with special focus to nanosized drug delivery systems. Major challenges of nano-DDS include (1) premature drug release, (2) rapid uptake by the RES system and immune responses, (3) unintended accumulation in ovaries and adrenals.

KiNSIS members will receive the link to the talk on Zoom via email about a week in advance.

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Ab-initio description of Warm Dense Matter: Goals, challenges, and opportunities (Dr. Tobias Dornheim, Helmholtz-Zentrum Dresden-Rossendorf)

Dec 07, 2021 from 04:15 PM

Hybrid, Physikalisches Kolloquium

DornheimDr. Tobias Dornheim (Center for Advanced Systems Understanding (CASUS) Görlitz, Helmholtz-Zentrum Dresden-Rossendorf (HZDR))

Warm dense matter (WDM)---an extreme state that is characterized by extreme densities and temperatures---has emerged as one of the most active frontiers in plasma physics and material science. In nature, WDM occurs in astrophysical objects such as giant planet interiors and brown dwarfs. In addition, WDM is highly important for cutting-edge technological applications such as inertial confinement fusion and the discovery of novel materials.

In the laboratory, WDM is studied experimentally in large facilities around the globe, and new techniques have facilitated unprecedented insights into exciting phenomena like the formation of nano diamonds at planetary interior conditions [1]. Yet, the interpretation of these experiments requires a reliable diagnostics based on accurate theoretical modeling, which is a notoriously difficult task [2].

In this talk, I give an overview of recent ground-breaking developments in WDM theory, including its static [3], dynamic [4], and nonlinear [5] properties. Finally, I will present a road map towards a true ab-initio description of WDM.

[1] D. Kraus et al., Nature Astronomy 1, 606-611 (2017)
[2] M. Bonitz et al., Physics of Plasmas 27, 042710 (2020)
[3] T. Dornheim et al., Physics Reports 744, 1-86 (2018)
[4] T. Dornheim et al., Physical Review Letters 121, 255001 (2018)
[5] T. Dornheim et al., Physical Review Letters 125, 085001 (2020)

 

The hybrid talk is part of the Physikalisches Kolloquium of the department of physics of Kiel University. Everybody interested is cordially invited: Geiger Lecture Hall (Leibnizstraße 15), Kiel or www.physik.uni-kiel.de/de/veranstaltungen/physikalisches-kolloquium

 

Michael Bonitz

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Prof. Dr. Olli Ikkala, Aalto University - Finland

Dec 09, 2021 from 05:00 PM to 06:30 PM

OHP5 - Chemiehörsaal II

IkkalaProf. Dr. Olli Ikkala, Aalto University, Department of Applied Physics, Espoo, Finland

Biological systems inspire materials scientists towards pursuing ever more complex  and even “life-like” interactive properties. Biological systems are characteristically driven out of equilibrium by feeding energy, which facilitates new functions not allowed in equilibrium. This talk first discusses iron oxide nanoparticle based ferrofluids which are exposed to ac-magnetic or dc-electric fields to form out-of-equilibrium patterns that are not observed in equilibrium. As a second topic, biological learning processes inspire approaches to go beyond the classic stimulus-responsive and shape memory materials to allow more interactive materials. The talk describes how gold nanoparticle and photoacid adducts in a hydrogel can be engineered to algorithmically mimic classical conditioning known in psychology. Finally it is shown how nickel nanoparticle clusters exposed to magnetic fields allow electrically conducting assemblies that can algorithmically mimic nonassociative learning processes. Materials with life-inspired properties are foreseen to allow e.g. autonomous devices and soft robotics in the future.

Registration: two weeks before the presentation at the openOLATpage of the GDCh Kiel. Audience limited to 30 people.
Part of the GDCh colloquium of the department of chemistry - everybody is welcomed.

Prof. Dr. Norbert Stock / KiNSIS

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KiNSIS Genereal Assembly

Dec 10, 2021 from 02:00 PM to 04:00 PM

Olshausenstraße 40, Norbert-Gansel-Hörsaal

LogogThe agenda will be sent to the members of KiNSIS soon. If you have any items for the agenda, please email them to Tina Kerby.

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Investigating strong excitations and non-equilibrium in dense matter – HED research at the European XFEL (Dr. Ulf Zastrau, European XFEL)

Dec 21, 2021 from 04:15 PM

Hybrid, Physikalisches Kolloquium

ZastrauThe advent of X-ray free-electron lasers (XFELs) may prove to be the most profound development since the invention of the laser and, equally, the synchrotron. Sharp improvements in a number of laser parameters, most notably intensity and pulse duration, support this expectation. Indeed, the unprecedented opportunities and expectations have triggered considerable research activities worldwide.

In my talk, I will give an overview of the experimental possibilities at the European XFEL, located in Schenefeld, Schleswig-Holstein. European XFEL currently operates six end-stations for studies with highest spatio-temporal resolution using soft and hard x-rays. The applications range from atomic physics over chemistry and biology to material science and extreme conditions research.

In particular, the intense femtosecond x-ray pulses can resolve ultrafast processes which are not accessible at any other x-ray facility such as synchrotrons. Using available optical lasers, solid samples can be excited by moderate to ultra-relativistic intensities. The subsequent non-equilibrium states, equilibration dynamics within the electronic system and between electrons and lattice can be observed by state of the art x-ray methods.

In particular, the High Energy Density Science (HED) instrument allows international users to investigate a wide range of materials and systems at extreme conditions [1,2]. European XFEL and the HIBEF user consortium [3] form a joint group of more than 30 people for HED research, development and user operation. We offer three optical laser systems, as well as a dedicated platform for research in diamond anvil cells for high pressure science. In the near future, a pulsed magnet for transient studies of superconductivity will be introduced.

The talk will present the specific capabilities and research highlights of the HED instrument [4-6], and in a second part provide an overview of the wider research scope of the entire facility to identify and establish potential collaborations.

[1] U. Zastrau, et al., J. Synchrotron Rad. (2021). 28, 1393-1416
[2] K. Appel, et al., Plasma Phys. Control. Fusion 57, 014003 (2015)
[3] www.hibef.de; McMahon and Zastrau, DOI: 10.22003/XFEL.EU-TR-2017-001
[4] A. Descamps et al., Sci Rep 10 (1), 14564 (2020)
[5] H. Hwang et al.; Journal of Physical Chemistry Letters, 2021;
DOI: 10.1021/acs.jpclett.1c00150
[6] H.-P. Liermann et al.; Journal of Synchrotron Radiation, 2021;
DOI: 10.1107/S1600577521002551

Inviter: Michael Bonitz

The hybrid talk is part of the Physikalisches Kolloquium of the department of physics of Kiel University. Everybody interested is cordially invited: Geiger Lecture Hall (Leibnizstraße 15), Kiel or www.physik.uni-kiel.de/de/veranstaltungen/physikalisches-kolloquium

Michael Bonitz

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Prof. Peter Hommelhoff (University of Erlangen)

Jan 18, 2022 from 06:15 PM

Prof. Nienke van der Marel (Leiden University, Netherlands)

Jan 25, 2022 from 04:15 PM

Hybrid, Physikalisches Kolloquium

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News

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Calendar

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  • all day: 10th International Workshop on Functional Nanocomposites
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  • all day: 10th International Workshop on Functional Nanocomposites
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  • all day: 10th International Workshop on Functional Nanocomposites
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  • all day: 10th International Workshop on Functional Nanocomposites
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  • 16:00: "The fly's eye illustrates a new principle of neural circuit design", Simon Laughlin, University Cambrige, UK (CRC 1461)
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  • all day: KiNSIS Retreat
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  • all day: KiNSIS Retreat
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  • 12:00: KiNSIS Lunch 'n' Meet + Lab Visits
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