Particle-hole character of the Higgs and Goldstone modes in strongly-interacting lattice bosons
Autor: | Di Liberto, M., Recati, A., Trivedi, N., Carusotto, I., Menotti, C. |
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Rok vydání: | 2017 |
Předmět: | |
Zdroj: | Phys. Rev. Lett. 120, 073201 (2018) |
Druh dokumentu: | Working Paper |
DOI: | 10.1103/PhysRevLett.120.073201 |
Popis: | We study the low-energy excitations of the Bose-Hubbard model in the strongly-interacting superfluid phase using a Gutzwiller approach and extract the single-particle and single-hole excitation amplitudes for each mode. We report emergent mode-dependent particle-hole symmetry on specific arc-shaped lines in the phase diagram connecting the well-known Lorentz-invariant limits of the Bose-Hubbard model. By tracking the in-phase particle-hole symmetric oscillations of the order parameter, we provide an answer to the long-standing question about the fate of the pure amplitude Higgs mode away from the integer-density critical point. Furthermore, we point out that out-of-phase oscillations are responsible for a full suppression of the condensate density oscillations of the gapless Goldstone mode. Possible detection protocols are also discussed. Comment: 6 pages, 3 figures |
Databáze: | arXiv |
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