Department of Applied Physics Research Seminar: Dr. Timo Hyart

Dr. Timo Hyart (International Research Centre MagTop, Warsaw, Poland) will give a research seminar "Correlated States in Flat-Band Systems".
Seminar advert Timo Hyart
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Timo Hyart

Dr. Timo Hyart is a team leader at the International Centre for Interfacing Magnetism and Superconductivity with Topological Matter in Warsaw, and currently a visiting researcher in the Correlated Quantum Materials group at Aalto University. Hyart’s research focuses on the theory of exciton condensates, superconductors, magnetism, topological materials, and topological quantum computation.

Seminar abstract:

The quenched kinetic energy in the flat-band systems increases the importance of interactions and leads to superconductivity and other correlated states. I will discuss examples of symmetry-broken states in flat-band systems starting from the best understood quantum Hall ferromagnets and exciton condensates [1] and continuing with more complicated quantum Hall systems [2] and moiré superlattices [3] which are characterized by competition between different order parameters [3, 4]. I will emphasize that in contrast to the systems where the Fermi energy is the largest energy scale, the properties of the flat-band systems are determined by the whole band, including effects originating from the quantum metric of the Bloch wavefunctions [3,5,6]. Finally, I will discuss our proposal to design a three-dimensional flat band [7].

References [1] T. Hyart, B. Rosenow, Phys. Rev. B 83, 155315 (2011); D. I. Pikulin, P. G. Silvestrov, T. Hyart, Nature Communications 7, 10462 (2016). [2] Y. Li et al., Phys. Rev. B 101, 241405 (2020). [3] T. T. Heikkilä, T. Hyart, Europhys. News 50, 24 (2019). [4] R. Ojajärvi et al., Phys. Rev. B 98, 054515 (2018). [5] X. Hu, T. Hyart, D. I. Pikulin, E. Rossi, Phys. Rev. Lett. 123, 237002 (2019). [6] X. Hu, T. Hyart, D. I. Pikulin, E. Rossi, arXiv:2008.03241 [7] A. Lau, T. Hyart et al., arXiv:2008.09122

Host: Prof. Jose Lado

Zoom link available on request to [email protected].

Everybody interested welcome to attend!

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