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Superfluidity and dimerization in a multilayered system of fermionic polar molecules.
Andrew C Potter1, Erez Berg, Daw-Wei Wang
1Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Physical Review Letters
|January 15, 2011
Summary
Fermionic molecules in layered systems form a dimerized superfluid due to attractive interlayer interactions. An unusual pseudogap state with short-range coherence emerges at intermediate temperatures.
Area of Science:
- Condensed matter physics
- Quantum many-body systems
- Ultracold atomic gases
Background:
- Fermionic molecules with permanent dipole moments can exhibit unique quantum behaviors when arranged in layered structures.
- External fields can align these dipoles, leading to anisotropic interactions and novel collective states.
- Interlayer interactions are crucial for understanding emergent phenomena in low-dimensional quantum systems.
Purpose of the Study:
- To investigate the ground state and thermal properties of a layered system of dipolar fermionic molecules.
- To explore the role of interlayer attractive interactions in inducing molecular pairing and superfluidity.
- To characterize the interplay between dimerization and superfluid phase fluctuations.
Main Methods:
- Theoretical modeling of a layered system of fermionic molecules with aligned dipoles.
- Development of an effective Ising-XY lattice model to capture dimerization and phase fluctuations.
- Mean-field analysis to determine the ground state and thermal phases.
Main Results:
- Attractive dipole interactions between adjacent layers induce interlayer pairing, leading to a dimerized superfluid ground state.
- The system exhibits pairing only between every other layer due to competition for pairing.
- An unusual dimerized pseudogap state with short-range phase coherence is identified at intermediate temperatures.
Conclusions:
- The competition for pairing in layered dipolar fermionic systems results in a unique dimerized superfluid ground state.
- A novel intermediate-temperature phase, characterized by dimerization and short-range phase coherence, is predicted.
- Light-scattering experiments are proposed as a viable method to experimentally detect the predicted dimerization.
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