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SUMMARY:Quantum oscillations in a solvable Kondo insulator
DTSTART:20260723T060000Z
DTEND:20260723T070000Z
DTSTAMP:20260802T185200Z
UID:indico-event-9392@scitalks.tifr.res.in
DESCRIPTION:Speakers: Abhisek Samanta (IIT Gandhinagar.)\n\nWe study the e
 ffects of interactions on low-energy density of states (SdH) and magnetiza
 tion (dHvA) quantum oscillations (QOs) in a Kondo insulator. We consider a
  hybridization-gap insulator and incorporate interactions among N flavors 
 of the heavy f electrons using a periodic Anderson model with Sachdev-Ye-K
 itaev (SYK) interactions at each site. This model is exactly solvable in t
 he large-N limit. We analytically and numerically show that the insulating
  state remains stable in terms of spectrum\, thermodynamics and transport 
 at low temperatures even for interaction strength much larger than non-int
 eracting band gap. We derive extended Lifshitz-Kosevich (LK)-like analytic
 al formulae\, distinct for SdH and dHvA QOs\, for the interacting insulato
 r. We find that the SdH oscillation frequencies\, F0 ± δF\, correspondin
 g to the conduction and valence band edges\, can be weakly renormalized by
  interaction from their non-interacting values. In contrast\, dHvA QOs are
  not renormalized by interactions\, occurring at the frequency F0 for non-
 interacting unhybridized bands. The QO amplitudes show a remarkable differ
 ence: the dHvA amplitude is essentially unaffected by interaction\, while 
 the SdH amplitude is strongly enhanced\n\nhttps://scitalks.tifr.res.in/eve
 nt/9392/
LOCATION:A304 and on Zoom
URL:https://scitalks.tifr.res.in/event/9392/
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