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Collective excitations and quantum incompressibility in electron-hole bilayers

De Palo S.
•
Trevisanutto P. E.
•
Senatore G.
•
Vignale G.
2021
  • journal article

Periodico
PHYSICAL REVIEW. B
Abstract
We apply quantum continuum mechanics to the calculation of the excitation spectrum of a coupled electron-hole bilayer. The theory expresses excitation energies in terms of ground-state intra- and interlayer pair correlation functions, which are available from quantum Monte Carlo calculations. The final formulas for the collective modes deduced from this approach coincide with the formulas obtained in the “quasilocalized particle approximation” by Kalman et al. [G. Kalman, V. Valtchinov, and K. I. Golden, Phys. Rev. Lett.82, 3124 (1999)10.1103/PhysRevLett.82.3124], and likewise the theory predicts the existence of gapped excitations in the charged channel, with the gap arising from electron-hole correlation. An immediate consequence of the gap is that the static density-density response function of the charged channel vanishes as for wave vector , rather than linearly in , as commonly expected. In this sense, the system is incompressible. This feature, which has no analog in the classical electron-hole plasma, is consistent with the existence of an excitonic ground state and implies the existence of a discontinuity in the chemical potential of electrons and holes when the numbers of electrons and holes are equal. It should be experimentally observable by monitoring the densities of electrons and holes in response to potentials that attempt to change these densities in opposite directions.
DOI
10.1103/PhysRevB.104.115165
WOS
WOS:000704416900002
Archivio
http://hdl.handle.net/11368/2998943
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85116356945
Diritti
closed access
license:digital rights management non definito
license uri:iris.pri00
FVG url
https://arts.units.it/request-item?handle=11368/2998943
Soggetti
  • condensed matter phys...

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