Supersolidity of cnoidal waves in an ultracold Bose gas
A one-dimensional Bose-Einstein condensate may experience nonlinear periodic modulations known as cnoidal waves. We argue that such structures represent promising candidates for the study of supersolidity-related phenomena in a nonequilibrium state. A mean-field treatment makes it possible to rederi...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2021-02-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.3.013143 |
| _version_ | 1827285880083054592 |
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| author | Giovanni I. Martone Alessio Recati Nicolas Pavloff |
| author_facet | Giovanni I. Martone Alessio Recati Nicolas Pavloff |
| author_sort | Giovanni I. Martone |
| collection | DOAJ |
| description | A one-dimensional Bose-Einstein condensate may experience nonlinear periodic modulations known as cnoidal waves. We argue that such structures represent promising candidates for the study of supersolidity-related phenomena in a nonequilibrium state. A mean-field treatment makes it possible to rederive Leggett's formula for the superfluid fraction of the system and to estimate it analytically. We determine the excitation spectrum, for which we obtain analytical results in the two opposite limiting cases of (i) a linearly modulated background and (ii) a train of dark solitons. The presence of two Goldstone (gapless) modes, associated with the spontaneous breaking of U(1) symmetry and of continuous translational invariance, at long wavelength is verified. We also calculate the static structure factor and the compressibility of cnoidal waves, which show a divergent behavior at the edges of each Brillouin zone. |
| first_indexed | 2024-04-24T10:20:55Z |
| format | Article |
| id | doaj.art-d837fa3e39ee4094a110a53dfb481709 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:20:55Z |
| publishDate | 2021-02-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-d837fa3e39ee4094a110a53dfb4817092024-04-12T17:07:20ZengAmerican Physical SocietyPhysical Review Research2643-15642021-02-013101314310.1103/PhysRevResearch.3.013143Supersolidity of cnoidal waves in an ultracold Bose gasGiovanni I. MartoneAlessio RecatiNicolas PavloffA one-dimensional Bose-Einstein condensate may experience nonlinear periodic modulations known as cnoidal waves. We argue that such structures represent promising candidates for the study of supersolidity-related phenomena in a nonequilibrium state. A mean-field treatment makes it possible to rederive Leggett's formula for the superfluid fraction of the system and to estimate it analytically. We determine the excitation spectrum, for which we obtain analytical results in the two opposite limiting cases of (i) a linearly modulated background and (ii) a train of dark solitons. The presence of two Goldstone (gapless) modes, associated with the spontaneous breaking of U(1) symmetry and of continuous translational invariance, at long wavelength is verified. We also calculate the static structure factor and the compressibility of cnoidal waves, which show a divergent behavior at the edges of each Brillouin zone.http://doi.org/10.1103/PhysRevResearch.3.013143 |
| spellingShingle | Giovanni I. Martone Alessio Recati Nicolas Pavloff Supersolidity of cnoidal waves in an ultracold Bose gas Physical Review Research |
| title | Supersolidity of cnoidal waves in an ultracold Bose gas |
| title_full | Supersolidity of cnoidal waves in an ultracold Bose gas |
| title_fullStr | Supersolidity of cnoidal waves in an ultracold Bose gas |
| title_full_unstemmed | Supersolidity of cnoidal waves in an ultracold Bose gas |
| title_short | Supersolidity of cnoidal waves in an ultracold Bose gas |
| title_sort | supersolidity of cnoidal waves in an ultracold bose gas |
| url | http://doi.org/10.1103/PhysRevResearch.3.013143 |
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