Understanding the complex states of quantum matter with resonant inelastic x-ray scattering

Spezialisiert / Akademisch Kolloquium / Kongress / Forum

Recently resonant inelastic x-ray scattering (RIXS) has positioned itself as one of the main spectroscopic techniques that is used to understand the complex states of quantum matter [1].
In this talk I will give a brief overview of the RIXS technique and describe the experiments which have contributed to such a huge success of RIXS:

In the first part, I will concentrate on the experimental observation of an orbiton——a collective excitation of a solid which carries solely an orbital quantum number——and
the concomitant separation of the spin and orbital degrees of freedom of an electron in the quasi-one-dimensional copper oxides [2]. Next, in the second part of the talk,
I will discuss how RIXS has observed the collective magnetic excitations in the (doped) copper oxides [3] and how one can understand this phenomenon [4].
I will end the talk by explaining whether this surprising finding could influence the theories of high-temperature superconductivity in these compounds.


[1] L. J. P. Ament et al., Rev. Mod. Phys. 83, 705 (2011); C. J. Jia et al, Phys. Rev. X 6, 021020 (2016).
[2] J. Schlappa et al., Nature 485, 82 (2012).
[3] M. P. M. Dean et al., Nature Materials 12, 1019 (2013); W. S. Lee et al., Nature Physics 10, 883 (2014); M. Minola, et al., Phys. Rev. Lett. 119, 097001 (2017).
[4] C. J. Jia et al, Nature Communications 5, 3314 (2014); E. Paerschke et al., Physical Review B 99, 205102 (2019).

Vortragende Prof. Krzysztof Wohlfeld
Institute of Theoretical Physics,
Faculty of Physics,
University of Warsaw, Poland
Kontakt Département de Physique, Groupe prof. Ph. Aebi
Prof. Cl. Monney
Zurück zur Liste