Excitation Spectrum of a Trapped Dipolar Supersolid and Its Experimental Evidence
| Autor: | R. M. W. van Bijnen, D. Petter, Francesca Ferlaino, A. Patscheider, Lauriane Chomaz, Manfred J. Mark, G. Natale |
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| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Phase transition Condensed matter physics Bose gas Atomic Physics (physics.atom-ph) Oscillation Condensed Matter::Other FOS: Physical sciences General Physics and Astronomy 01 natural sciences 010305 fluids & plasmas 3. Good health Physics - Atomic Physics Superfluidity Supersolid Quantum Gases (cond-mat.quant-gas) Phase (matter) 0103 physical sciences 010306 general physics Condensed Matter - Quantum Gases Excitation Phase diagram |
| Zdroj: | Physical Review Letters |
| ISSN: | 0031-9007 0038-5646 0368-3400 |
| DOI: | 10.1103/physrevlett.123.050402 |
| Popis: | We study the spectrum of elementary excitations of a dipolar Bose gas in a three-dimensional anisotropic trap across the superfluid-supersolid phase transition. Theoretically, we show that, when entering the supersolid phase, two distinct excitation branches appear, respectively associated with dominantly crystal and superfluid excitations. These results confirm infinite-system predictions, showing that finite-size effects play only a small qualitative role, and connect the two branches to the simultaneous occurrence of crystal and superfluid orders. Experimentally, we probe compressional excitations in an Er quantum gas across the phase diagram. While in the Bose-Einstein condensate regime the system exhibits an ordinary quadrupole oscillation, in the supersolid regime we observe a striking two-frequency response of the system, related to the two spontaneously broken symmetries. 9 pages, 6 figures |
| Databáze: | OpenAIRE |
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