Exciton supersolid of spatially indirect exciton in bilayer semiconductor devices.
ORAL
Abstract
We predict a supersolid phase of spatially indirect excitons[1]. The electrons and holes are confined in separate layers of a bilayer semiconductor heterostructure. The separation between layers and the electron and hole densities are used as parameters to tune the strength of the exciton-exciton dipolar-like repulsive interactions.
Superfluid condensation of excitons has been predicted and demonstrated in bilayer semiconductors for small layer separations [2-5]. At larger layer separations with stronger dipolar interactions, a phase transition to an exciton crystal has been predicted [6].
Using a variational approach, we are able to identify a region in phase space at intermediate layer separations, where a supersolid phase is stable relative to both the exciton crystal and superfluid phases. In the supersolid phase, translational symmetry of the exciton crystal and the phase coherence of the exciton condensate are simultaneously preserved.
[1] G. V. Chester Phys. Rev. A 2 256 (1970)
[2] A. Perali, et al. Phys. Rev. Lett. 110, 146803 (2013)
[3] S. Conti, et al. Phys. Rev. B 101, 220504(R) (2020).
[4] G. W. Burg, et al. Phys. Rev. Lett. 120, 177702 (2018)
[5] Z. Wang, et al. Nature 574, 76 (2019).
[6] G. E. Astrakharchik, et al. Phys. Rev. Lett. 98, 060405 (2007)
Superfluid condensation of excitons has been predicted and demonstrated in bilayer semiconductors for small layer separations [2-5]. At larger layer separations with stronger dipolar interactions, a phase transition to an exciton crystal has been predicted [6].
Using a variational approach, we are able to identify a region in phase space at intermediate layer separations, where a supersolid phase is stable relative to both the exciton crystal and superfluid phases. In the supersolid phase, translational symmetry of the exciton crystal and the phase coherence of the exciton condensate are simultaneously preserved.
[1] G. V. Chester Phys. Rev. A 2 256 (1970)
[2] A. Perali, et al. Phys. Rev. Lett. 110, 146803 (2013)
[3] S. Conti, et al. Phys. Rev. B 101, 220504(R) (2020).
[4] G. W. Burg, et al. Phys. Rev. Lett. 120, 177702 (2018)
[5] Z. Wang, et al. Nature 574, 76 (2019).
[6] G. E. Astrakharchik, et al. Phys. Rev. Lett. 98, 060405 (2007)
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Presenters
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Sara Conti
University of Antwerp, Department of Physics, University of Antwerp, 2020 Antwerp, Belgium
Authors
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Sara Conti
University of Antwerp, Department of Physics, University of Antwerp, 2020 Antwerp, Belgium
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David Neilson
University of Antwerp, Department of Physics, University of Antwerp, 2020 Antwerp, Belgium, Univ of Camerino
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Andrea Perali
School of Pharmacy, University of Camerino, 62032 Camerino (MC), Italy
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Francois M Peeters
Univ of Antwerp, Belgium, University of Antwerp, Department of Physics, University of Antwerp, 2020 Antwerp, Belgium, Univ of Antwerp