BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Non-stationary longitudinal Josephson effect in bilayer systems wi
 th electron-hole pairing
DTSTART;VALUE=DATE-TIME:20260922T141000Z
DTEND;VALUE=DATE-TIME:20260922T141500Z
DTSTAMP;VALUE=DATE-TIME:20260914T044352Z
UID:indico-contribution-522@indico.bitp.kiev.ua
DESCRIPTION:Speakers: Oleksandr Konstantynov (B.Verkin Institute for Low T
 emperature Physics and Engineering  of the National Academy of Sciences of
  Ukraine)\nThe non-stationary longitudinal Josephson effect in bilayer sys
 tems with pairing of spatially separated electrons and holes is investigat
 ed [1]. The tunneling current between two weakly coupled electron-hole con
 densates (right and left) is analyzed in the presence of an external volta
 ge applied along the layers. Two limiting regimes are considered: the high
 -density regime\, where pairing occurs in momentum space similarly to conv
 entional superconductors\, and the low-density regime corresponding to a B
 ose-Einstein condensate of spatially indirect excitons. Using the tunnelin
 g Hamiltonian approach\, expressions for the quasiparticle\, superconducti
 ng\, and interference contributions to the tunneling current are derived. 
 It is shown that in the high-density limit\, the quasiparticle and interfe
 rence currents vanish at zero temperature below a threshold voltage determ
 ined by the energy gap\, so that only the supercurrent remains. In contras
 t\, in the low-density regime\, the gapless spectrum of collective excitat
 ions leads to finite dissipative contributions even at zero temperature\, 
 resulting in damping of Josephson oscillations. For spatially separated tu
 nneling barriers with a distance exceeding the coherence length\, phase ju
 mps occur at each barrier\, resulting in voltage oscillations across the e
 lectron and hole barriers and a nonsinusoidal current-phase relation gover
 ned by the critical currents of the two barriers. Observation of the chara
 cteristic features of the longitudinal Josephson effect would provide dire
 ct evidence of superfluidity in the bilayer exciton condensate [2].\n\n[1]
  O. M. Konstantynov and S. I. Shevchenko\, Low Temp. Phys. **52**\, 1063 (
 2026). https://doi.org/10.1063/10.0044481\n[2] F. Pascucci\, A. R. Hamilto
 n\, M. V. Milošević\, and D. Neilson\, arXiv:2606.23303 (2026). https://
 doi.org/10.48550/arXiv.2606.23303\n\nhttps://indico.bitp.kiev.ua/event/18/
 contributions/522/
LOCATION:Bogolyubov Institute for Theoretical Physics Conference Hall
URL:https://indico.bitp.kiev.ua/event/18/contributions/522/
END:VEVENT
END:VCALENDAR