Dr. Martin Klanjšek: Louder than magnetism: phonon-modulated exchange interactions

Datum objave: 1. 12. 2015
Ponedeljkov fizikalni kolokvij
Ponedeljek, 7. december 2015, ob 16:15 v predavalnici F1, FMF UL, Jadranska 19, Ljubljana
Pred predavanjem vse udeležence vabimo na čaj!

Povzetek:

Louder than magnetism: phonon-modulated exchange interactions

 

                     Dr. Martin Klanjšek

                    Institut Jožef Stefan, Ljubljana

Study of collective quantum phenomena is at the heart of condensed matter physics. Quantum magnets provide an excellent playground for this purpose as they feature simple Hamiltonians based on only spin degrees of freedom. In the last two decades, they have allowed an insight into Bose-Einstein condensation, Tomonaga-Luttinger liquids, quantum liquids and quantum criticality. In molecular solids, a class of quantum magnets containing molecules as structural and magnetic units, spins cannot be decoupled from lattice and orbital degrees of freedom, usually resulting in complex physics. I will present the case of the model molecular solid CsO2, where this physics nevertheless simplifies to two interesting phenomena: hugely temperature-dependent exchange interactions originating from the phononic modulation and the spin Tomonaga-Luttinger liquid.