Seminar: Shaky moment — molecular vibrations causing magnetism

  • Date:
  • Location: Zoom:
  • Lecturer: Jonas Fransson
  • Contact person: Annica Black-Schaffer
  • Seminarium

In condensed matter, vibrations are often regarded as a nuisance and merely a source for decoherence. While new results, both theoretical and experimental, emerge showing that this may not be a complete, or even good, picture to construct a viable theory for ordered structures, e.g., magnetic order, it is challenging to overcome the concept of thermal destruction of order due to vibrational excitations. Here, I will discuss new theoretical results that point towards the possibility of stabilizing magnetic configurations (order?) when electrons, or spins, are coupled to lattice vibrations (phonons). These results can be connected to recent experimental results which can be explained in terms of those theoretical ideas.

Reference material:

J. Fransson, D. Thonig, P. V. Bessarb, S. Bhattacharjee, J. Hellsvik, and L. Nordström, Microscopic Theory for Coupled Atomistic Magnetization and Lattice Dynamics, Phys. Rev. Mater. 1, 074404 (2017).

A. K. Mondal, N. Brown, S. Mishra, P. Makam, D. Wing, S. Gilead, Y. Wiesenfeld, G. Leitus, L. J. W. Shimon, R. Carmieli, D. Ehre, G. Kamieniarz, J. Fransson, O. Hod, L. Kronik, E. Gazit, and R. Naaman, Long-Range Spin-Selective Transport in Chiral Metal-Organic Crystals with Temperature-Activated Magnetization, ACS Nano, 14, 16624 (2020).

J. Fransson, Vibrational origin of exchange splitting and chiral-induced spin selectivity, Phys. Rev. B, 102, 235416 (2020).

J. Fransson, Charge Redistribution and Spin Polarization Driven by Correlation Induced Exchange in Chiral Molecules, Nano Lett. 21, 3026 (2021).

Y. S. Sang, Mishra, F. Tassinari, K. S. Kumara, R. Carmieli, R. D. Teo, A. Migliore, D. N. Beratan, H. B. Gray, I. Pecht, J. Fransson, D. H. Waldeck, R. Naaman, Temperature dependence of charge and spin transfer in azurin, J. Phys. Chem. C, 125, 9875 (2021).