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Observation of a Dynamical Sliding Phase Superfluid with P-Band Bosons
Linxiao Niu1, Shengjie Jin1, Xuzong Chen1
1School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, China.
Physical Review Letters
|January 13, 2019
Summary
Researchers observed a novel dynamical sliding phase superfluid in ultracold atomic gases. This nonequilibrium phenomenon exhibits superfluidity in specific directions, offering new insights into many-body quantum systems.
Area of Science:
- Atomic, Molecular, and Optical Physics
- Condensed Matter Physics
- Quantum Many-Body Systems
Background:
- Sliding phases are crucial in many-body systems like superconductors and liquid crystals.
- Previous research sought dynamical sliding phases in coupled XY models.
- Understanding these phases is key to various advanced material properties.
Purpose of the Study:
- To experimentally observe and characterize a dynamical sliding phase superfluid.
- To investigate the emergence of such phases in a nonequilibrium setting.
- To explore novel quantum dynamics in ultracold atomic gases.
Main Methods:
- Utilizing a three-dimensional ultracold atomic gas loaded into the P band of a 1D optical lattice.
- Employing a shortcut loading method for rapid atom transfer to the P band.
- Analyzing the quantum dynamics and phase coherence of the atomic ensemble.
Main Results:
- Observation of a dynamical sliding phase superfluid in a nonequilibrium ultracold atomic gas.
- Identification of an intermediate time window (tens of milliseconds) with robust phase coherence.
- Demonstration of superfluid coherence in pancake directions but not the lattice direction.
Conclusions:
- The experiment successfully created and observed a dynamical sliding phase superfluid.
- Cross-dimensional energy transfer is proposed as the mechanism for the sliding phase.
- This work opens avenues for exploring exotic dynamical phases using high-band excitations in optical lattices.
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