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Defect-induced supersolidity with soft-core bosons
F Cinti1, T Macrì2, W Lechner3
11] Max Planck Institute for the Physics of Complex Systems, 01187 Dresden, Germany [2] National Institute for Theoretical Physics (NITheP), Stellenbosch 7600, South Africa.
Nature Communications
|February 5, 2014
Summary
Researchers discovered a new solid phase of matter exhibiting continuous-space supersolidity. This defect-induced superfluid flow in a two-dimensional bosonic system aligns with the theoretical Andreev-Lifshitz-Chester scenario.
Area of Science:
- Condensed Matter Physics
- Quantum Mechanics
- Materials Science
Background:
- The Andreev-Lifshitz-Chester (ALC) theory proposed a solid phase with superfluid properties due to zero-point defects.
- Experimental and theoretical evidence for the ALC scenario has been lacking for over 40 years.
Purpose of the Study:
- To investigate the zero-temperature phase diagram of two-dimensional bosons with soft-core interactions.
- To identify a physical system exhibiting the ALC mechanism of defect-induced supersolidity.
Main Methods:
- Theoretical investigation of a two-dimensional bosonic system.
- Analysis of the phase diagram at zero temperature.
- Focus on systems with finite-range soft-core interactions.
Main Results:
- Identification of a solid phase with spontaneously emerging zero-point vacancies at low particle densities.
- Observation of superfluid flow of particles through the crystal structure.
- The system demonstrates continuous-space supersolidity consistent with the ALC scenario.
Conclusions:
- This study presents the first unambiguous example of defect-induced supersolidity.
- The findings validate the long-standing theoretical predictions of Andreev, Lifshitz, and Chester.
- The discovered solid phase offers a new platform for studying quantum phenomena.
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