Nonlinear gap modes and compactons in a lattice model for spin-orbit coupled exciton-polaritons in zigzag chains
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We consider a system of generalized coupled Discrete Nonlinear Schrödinger (DNLS) equations, derived as a tight-binding model from the Gross-Pitaevskii-type equations describing a zigzag chain of weakly coupled condensates of exciton-polaritons with spin-orbit (TE-TM) coupling. We focus on the simplest case when the angles for the links in the zigzag chain are ±π/4 with respect to the chain axis, and the basis (Wannier) functions are cylindrically symmetric (zero orbital angular momenta). We analyze the properties of the fundamental nonlinear localized solutions, with particular interest in the discrete gap solitons appearing due to the simultaneous presence of spin–orbit coupling and zigzag geometry, opening a gap in the linear dispersion relation. In particular, their linear stability is analyzed. We also find that the linear dispersion relation becomes exactly flat at particular parameter values, and obtain corresponding compact solutions localized on two neighboring sites, with spi...n-up and spin-down parts π/2 out of phase at each site. The continuation of these compact modes into exponentially decaying gap modes for generic parameter values is studied numerically, and regions of stability are found to exist in the lower or upper half of the gap, depending on the type of gap modes. © 2019 The Author(s).
Кључне речи:
nonlinear localized modes / exciton-polaritons / spin-orbit coupling / zigzag chainИзвор:
Journal of Physics Communications, 2019, 3, 1, 015001-Финансирање / пројекти:
- Horizon 2020 [691011 SOLIRING]
- Swedish Research Council through the project 'Control of light and matter waves propagation and localization in photonic lattices' within the Swedish Research Links programme [348-2013-6752]
- Фотоника микро и нано структурних материјала (RS-MESTD-Integrated and Interdisciplinary Research (IIR or III)-45010)
DOI: 10.1088/2399-6528/aaf7c9
ISSN: 2399-6528
WoS: 000462249600003
Scopus: 2-s2.0-85078353724
Колекције
Институција/група
VinčaTY - JOUR AU - Johansson, Magnus M. AU - Beličev, Petra AU - Gligorić, Goran AU - Gulevich, Dmitry R. AU - Skryabin, Dmitry V. PY - 2019 UR - https://vinar.vin.bg.ac.rs/handle/123456789/8815 AB - We consider a system of generalized coupled Discrete Nonlinear Schrödinger (DNLS) equations, derived as a tight-binding model from the Gross-Pitaevskii-type equations describing a zigzag chain of weakly coupled condensates of exciton-polaritons with spin-orbit (TE-TM) coupling. We focus on the simplest case when the angles for the links in the zigzag chain are ±π/4 with respect to the chain axis, and the basis (Wannier) functions are cylindrically symmetric (zero orbital angular momenta). We analyze the properties of the fundamental nonlinear localized solutions, with particular interest in the discrete gap solitons appearing due to the simultaneous presence of spin–orbit coupling and zigzag geometry, opening a gap in the linear dispersion relation. In particular, their linear stability is analyzed. We also find that the linear dispersion relation becomes exactly flat at particular parameter values, and obtain corresponding compact solutions localized on two neighboring sites, with spin-up and spin-down parts π/2 out of phase at each site. The continuation of these compact modes into exponentially decaying gap modes for generic parameter values is studied numerically, and regions of stability are found to exist in the lower or upper half of the gap, depending on the type of gap modes. © 2019 The Author(s). T2 - Journal of Physics Communications T1 - Nonlinear gap modes and compactons in a lattice model for spin-orbit coupled exciton-polaritons in zigzag chains VL - 3 IS - 1 SP - 015001 DO - 10.1088/2399-6528/aaf7c9 ER -
@article{ author = "Johansson, Magnus M. and Beličev, Petra and Gligorić, Goran and Gulevich, Dmitry R. and Skryabin, Dmitry V.", year = "2019", abstract = "We consider a system of generalized coupled Discrete Nonlinear Schrödinger (DNLS) equations, derived as a tight-binding model from the Gross-Pitaevskii-type equations describing a zigzag chain of weakly coupled condensates of exciton-polaritons with spin-orbit (TE-TM) coupling. We focus on the simplest case when the angles for the links in the zigzag chain are ±π/4 with respect to the chain axis, and the basis (Wannier) functions are cylindrically symmetric (zero orbital angular momenta). We analyze the properties of the fundamental nonlinear localized solutions, with particular interest in the discrete gap solitons appearing due to the simultaneous presence of spin–orbit coupling and zigzag geometry, opening a gap in the linear dispersion relation. In particular, their linear stability is analyzed. We also find that the linear dispersion relation becomes exactly flat at particular parameter values, and obtain corresponding compact solutions localized on two neighboring sites, with spin-up and spin-down parts π/2 out of phase at each site. The continuation of these compact modes into exponentially decaying gap modes for generic parameter values is studied numerically, and regions of stability are found to exist in the lower or upper half of the gap, depending on the type of gap modes. © 2019 The Author(s).", journal = "Journal of Physics Communications", title = "Nonlinear gap modes and compactons in a lattice model for spin-orbit coupled exciton-polaritons in zigzag chains", volume = "3", number = "1", pages = "015001", doi = "10.1088/2399-6528/aaf7c9" }
Johansson, M. M., Beličev, P., Gligorić, G., Gulevich, D. R.,& Skryabin, D. V.. (2019). Nonlinear gap modes and compactons in a lattice model for spin-orbit coupled exciton-polaritons in zigzag chains. in Journal of Physics Communications, 3(1), 015001. https://doi.org/10.1088/2399-6528/aaf7c9
Johansson MM, Beličev P, Gligorić G, Gulevich DR, Skryabin DV. Nonlinear gap modes and compactons in a lattice model for spin-orbit coupled exciton-polaritons in zigzag chains. in Journal of Physics Communications. 2019;3(1):015001. doi:10.1088/2399-6528/aaf7c9 .
Johansson, Magnus M., Beličev, Petra, Gligorić, Goran, Gulevich, Dmitry R., Skryabin, Dmitry V., "Nonlinear gap modes and compactons in a lattice model for spin-orbit coupled exciton-polaritons in zigzag chains" in Journal of Physics Communications, 3, no. 1 (2019):015001, https://doi.org/10.1088/2399-6528/aaf7c9 . .