Download presentation
Presentation is loading. Please wait.
Published byFlorence Poole Modified over 7 years ago
1
Afdelingsbezoek 2017 Theory of Condensed Matter (TCM)
(Noordstraat, 3e verdieping)
2
Staf Misha Katsnelson Misha Titov Advanced Statistical Physics
Graphene Statistical Mechanics Condensed Matter Theory Annalisa Fasolino Shengjun Yuan Computational Physics Computational Physics
3
Onderzoek Fundamentele Natuurwetten zijn bekend: electromagnetisme, kwantummechanica Uit deze bekende bouwstenen onstaan erg gecompliceerde systemen Doel: - Voorspellen en begrijpen van meetbare eigenschappen van specifieke systemen Vanuit microscopische structuur grotere systemen begrijpen Methode: Pen en papier, (super-)computer en vaak een combinatie Onderwerpen: Electronische structuur, Magnetisme, Kwantumtransport Atomistische simulaties, Spindynamica, Many-body quantum physics
4
Studentenprojecten afgelopen jaar
Bachelor Tom Westerhout: Plasmonic properties in fractals Jacqueline Zeitler: Atomistic simulations of the shape of bubbles in van der Waals heterostructures Mark Beijer: Spin textures in Perovskites SrTiO3 heterostructures Master Matteo Stifano: Skyrmion Manipulation of Ultrathin Films by Modification of Exchange Interactions Davide Tisi: Temperature dependence of phonons in graphene: comparison of different theoretical models Giacomo Sesti: Symmetry analysis of spin-orbit torques in bilayers Claudius Müller: Topology and correlation effects in nodal‐line semimetals Huidige masterstudenten Maxime Gidding: Simulating charge distribution and screening Meer informatie:
6
Neural network approach to many-body quantum systems
Conventional computational approaches to strongly-correlated systems suffer from severe problems, like the sign problem in quantum Monte-Carlo. Recently, it was proposed to use machine learning as an alternative approach to analysis of many-body quantum systems, and it seems to significantly outperform the existent techniques. The problem: to apply reinforced learning of restricted Boltzmann machines to compute observables in the fermionic lattice models at finite density. Andrey Bagrov (HG03.065)
7
Antiferromagnetic Spintronics
Problem: Anti-ferromagnet materials have a hidden magnetic order that can be used to store and process information on very short time scales. How efficient can we manipulate Neel vector in antiferromagnets electronically? What is the best material for applications? Approach: You will study a realistic model of an antiferromagnet such as CuMnAs, to investigate the dynamics of the Neel vector in the presence of electric current. You will simulate domain dynamics caused by electric current and visualise the results Mikhail Titov (HG03.072) Robert Sokolewicz (HG03.069)
8
Non-equilibrium states of matter under light irradiation.
Recent development of the femtosecond laser offers an outstanding possibility to selectively excite different (plasmon, magnon and phonon) modes and induce novel phases of materials. Although calculations for the most general case of a non-equilibrium system are extremely complicated, recent investigations in this direction revealed a particular case of time-dependent perturbation that can be described analytically. This, so called off-resonant periodic driving, brings the system to a non-equilibrium steady state and offers a possibility to access novel phases of matter. Goal: Finding the effective Hamiltonian of the system, and finding analytical and numerical solutions to describe steady states. E. A. Stepanov (HG03.076)
9
Graphene bubbles Graphene can be exfoliated and deposited on
another material. Very often bubbles are formed where gases are trapped. Project EXP: Use atomistic simulations to predict shape of bubble and phase of gas How much gas can be trapped? Is it still a gas or becomes a liquid Why bubbles change shape with size ….. Preliminary results in bachelor thesis of Jacqueline Zeitler See Jan Los (HG03.075) en Annalisa Fasolino
10
Coherent control of nonlinear phonons in perovskites
Strong laser pulses allow to control lattice dynamics and induce structural phase transitions. To excite a needed phonon mode optically, one often needs to drive it indirectly, via other modes, nonlinearily coupled to it (see e.g., arxiv: ) In orthorombic perovskites like ErFeO3, phonons can create effective magnetic field, thereby realizing optical control of magnetism A reduced theoretical model for coupled driven phonon modes is to be derived, and optimal pulse shape for strong excitation of phonons will be studied. Figure 2: Dynamics of phonon modes driven by a chirped laser pulse and corresponding effective classical phase portrait A.Itin (HG03.072)
11
Stel ze nu, of straks tijdens de borrel!
Vragen? Stel ze nu, of straks tijdens de borrel!
Similar presentations
© 2025 SlidePlayer.com Inc.
All rights reserved.