Determination of the interaction in high-Tc cuprates through ARPES
Complete understanding of the coupling mechanism in high temperature (HTSC) cuprates remains unclear up to now. One way to reveal the mechanism is to find out how the electrons or quasiparticles interact with a certain degree of freedom (e.g. spin, charge, elementary excitation, etc.). By observing the deviation of the quasiparticle band dispersion from its bare-band dispersion, one could obtain information about many-body effects (for example
self-energy which is a complex parameter).
Angle resolve photoemission spectroscopy (ARPES) aka. k-space microscopy is a direct measurement of the quasiparticle band dispersion ,
i.e. energy versus momentum. From ARPES spectra, one could extract the real part of the self energy - which is related to mass renormalisation
of the quasi particle - as well as its imaginary part - which is related to the quasi particle lifetime.
In this group, we focus our research on using ARPES to find out more about the interaction in high-TC cuprates, mostly on the bilayer compound
(Pb,Bi)2Sr2CaCu2O8+x. This project is supported by FOM and EU.
1.) Many body effects illustrated |
2.) SLS synchrotron |
3.) EDM around the anti-node |
For more information, please contact Mark Golden