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Spinless Fulde-Ferrell superfluid in Haldane model with nearest-neighbor interaction
Chuanyi Zhang1,2, Weifeng Zhang1
1Henan Key Laboratory of Photovoltaic Materials, Henan University, Kaifeng, 475004, People's Republic of China.
Researchers propose a novel model for a spinless Fulde-Ferrell (FF) superfluid state using the Haldane model. This breakthrough enables modulation of the exotic FF state, crucial for advancing condensed matter physics research.
Area of Science:
- Condensed Matter Physics
- Superfluidity and Superconductivity
Background:
- The Fulde-Ferrell (FF) state is an exotic superconducting/superfluid state with Cooper pairs having finite center-of-mass momentum.
- Existing research primarily focuses on spinful systems, often requiring spin population imbalance.
Purpose of the Study:
- To propose a model for realizing and modulating a spinless FF superfluid.
- To investigate the conditions for the emergence of the FF state in a novel system.
Main Methods:
- Utilizing the Haldane model with nearest-neighbor interactions.
- Analyzing the phase transitions occurring upon simultaneous breaking of space-inversion and time-reversal symmetries.
Main Results:
- The FF state emerges when both space-inversion and time-reversal symmetries are broken, leading to a first-order phase transition.
- Higher Berezinskii-Kosterlitz-Thouless transition temperatures are achieved with larger Peierls phase values and smaller sublattice energy offsets.
Conclusions:
- The proposed Haldane model offers a feasible pathway for experimental detection of the spinless FF superfluid.
- This work provides new avenues for exploring exotic quantum states in condensed matter systems.
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