GHN-colloquium with Dr. Cliò Agrapidis

Summary

The GHN-Colloquium talk series features the female scientists of the Grete-Hermann-Network (GHN)—a newly founded international network of female researchers in condensed matter physics and neighboring research areas. Distinguished female researchers are invited to give a lecture on their research and current projects, as well as about their career paths, to inspire young female scientists in particular, and to exchange ideas. After the official talk there will be an internal GHN-networking event.

 

On 13 April 2021 we are happy to welcome Dr. Cliò Agrapidis from University of Warsaw who will give an online scientific talk about Exotic phenomena in the ferromagnetic frustrated J1-J2 chain.

 

 

 

 

Talk abstract

 

Frustrated one-dimensional (1D) magnets are known as ideal playgrounds for new exotic quantum phenomena to emerge. For instance, the interplay of frustration and fluctuations leads to unexpected order at low temperatures by spontaneously breaking of either a continuous or discrete symmetry: order by disorder. These systems are often not exactly solvable, so that numerical methods are to be used to determine their properties. In 1D, the most powerful numerical method for this goal is the density matrix renormalization group (DMRG). In this talk, I will show, through DMRG results, how symmetry protected topological order emerges as a consequence of order by disorder in an elementary 1D system such as the spin-1/2 ferromagnetic (J1) Heisenberg chain with next-nearest-neighbor antiferromagnetic (J2) interactions. Moreover, I will present another fascinating magnetic behaviour emerging when two such chains are coupled: spin nematicity.

 

 

 

 

About Cliò Agrapidis

 

 

Cliò Efthimia Agrapidis is a postdoctoral researcher in the group of Dr. Hab. Krzysztof Wohlfeld at the Institute of Theoretical Physics, Faculty of Physics, University of Warsaw. She earned her doctorate in Physics from Technische Universität Dresden in November 2019. Her doctoral research was carried out at the Institute of Theoretical Solid State Physics of the Leibniz Insitute for Solid State and Materials Research. Her research interests include frustrated magnetism, spin-orbital models, and quasi-particles and collective excitations.

 

Apart from her research in physics, she writes graphic biographies of women scientists, published online at stormi.info about Maria Goeppert Mayer (Text: Cliò Agrapidis, Drawing: Eliana Albertini) and Emmy Noether (Text: Cliò Agrapidis, Drawing: Elena Mistrello).