CMSP Seminar @ICTP Stasi Room: Brijesh KUMAR on Thursday 22 June at 11:30

[Condensed Matter Section]

Condensed Matter & Statistical Physics Seminar
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Thursday 22 June at 11:30 - L.Stasi Seminar Room

Speaker: Brijesh KUMAR (JNU, New Delhi, India)

"Quantum Oscillations of Magnetization in Kondo Insulators"

Abstract:

Motivated by recent observations of quantum oscillations of 
magnetization in a Kondo insulator (SmB_6), we investigate the Kondo 
lattice model of spin-1/2 local moments coupled to the conduction 
electrons at half-filling for its orbital response to magnetic field. 
The key finding of our study is that the quantum oscillations of 
magnetization in Kondo insulators occur as a bulk phenomenon, which 
manifests itself through the inversion of a Hofstadter - quantized 
dispersion of the gaped charge quasi-particles whose chemical-potential 
surface these oscillations measure . We find this through a minimal 
effective dynamics, in a certain canonical representation of electrons , 
that appropriately describes the Kondo insulating state, and reveals 
important new features such as the inversion and Lifshitz-like 
transition for the charge quasi-particles. We also predicts these 
oscillations to occur in the spin-density wave insulators .


All are welcome to attend.
http://indico.ictp.it/event/8264/