IPM Calendar 
Sunday 24 January 2021   Today  
Events for day: Wednesday 14 October 2020    
           11:00 - 12:00     Online Computational Nanoscience journal club
Accelerating crystal structure prediction by machine-learning interatomic potentials with active learning


Accelerating crystal structure prediction by machine-learning interatomic potentials with active learning


We propose a methodology for crystal structure prediction that is based on the evolutionary algorithm USPEX and the machine-learning interatomic potentials actively learning on-the-fly. Our methodology allows for an automated construction of an interatomic interaction model from scratch, replacing the expensive density functional theory (DFT) and giving a speedup of several orders of magnitude. Predicted low-energy structures are then tested on DFT, ensuring that our machine-learning model doe ...

           11:00 - 12:00     Wednesday Weekly Seminar-skyroom
Strong Coupling Constants of the Doubly Heavy ?QQ Baryons with ? Meson


Abstract: The doubly charmed ?++cc(ccu) state is the only listed baryon in PDG, which was discovered in the experiment. The LHCb collaboration gets closer to discovering the second doubly charmed baryon ?+cc(ccd), hence the investigation of the doubly charmed/bottom baryons from many aspects is of great importance that may help us not only get valuable knowledge on the nature of the newly discovered states, but also in the search for other members of the doubly heavy baryons predicted by the quark model. In this context, we investigate the strong coupling constants among the ?+(+)cc baryons and ?0() mesons by means of light cone QCD sum rule ...

           13:30 - 15:00     Weekly Seminar (Online)
Status of the Concordance Model of Cosmology


I review the status of the concordance (standard) LCDM model of cosmology in light of current observations discussing about the apparent tensions in estimation of the key cosmological parameters. I will also briefly discuss the future of the field at the era of the next generation of astronomical/cosmological surveys. ...

           14:00 - 15:00     Weekly Seminar
Condensed Matter and Statistical Physics Group
Ultrafast control of spin interactions in antiferromagnetic spin-orbit Mott insulators



We investigate the effect of high-frequency laser pulses on a 2D honeycomb lattice described by the extended Kane-Mele-Hubbard model at half-filling and in the strongly correlated regime, i.e., an antiferromagnetic spin-orbit Mott insulator. Based on a generalized Floquet formalism, we demonstrate that by changing the amplitude and frequency of laser pulses, one can tune the strengths and signs of the Heisenberg exchange and Dzyaloshinskii-Moriya spin interactions. Our results pave the way for ultrafast optical spin manipulation and quantum magnonics in recently discovered two-dimensional magnetic materials.
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           16:30 - 18:30     Mathtematical Logic Weekly Seminar
Combining Logic and Probability in the Presence of Symmetry


Among the many approaches to combining logic and probability, an important one has been to assign probabilities to formulas of a classical logic, instantiated from some fixed domain, in a manner that respects logical structure. A natural additional condition is to require that the distribution satisfy the symmetry property known as exchangeability. In the first part of this talk I will trace some of the history and context of this line of investigation, viewing exchangeability from a logical perspective. In the second part I will report on the current status of a joint programme of Ackerman, Freer and myself on countable exchangeable struct ...