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Bimodal Momentum Distribution of the High-Density Supersolid State

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Abstract

By performing exact quantum Monte Carlo simulations, we study the momentum distribution of the supersolid state in the two-dimensional extended Bose-Hubbard model with the nearest-neighbor repulsion. For strong nearest-neighbor repulsions, the supersolid state is stable in a broad region up to large hopping amplitudes and high particle densities. In the supersolid state, the momentum distribution shows a bimodal structure with two peaks related to the superfluidity and solidity respectively. By our calculations, we show that the bimodal structure becomes clearer as the chemical potential (or the particle density) is increased.

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Acknowledgements

This work was financially supported by the Global COE Program “the Physical Science Frontier”, the Grant-in-Aid for JSPS Fellows (Grant No. 249904), the Grant-in-Aid for Scientific Research (B) (22340111), and the Computational Materials Science Initiative (CMSI), Japan. The simulations were performed on computers at the Supercomputer Center, Institute for Solid State Physics, University of Tokyo.

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Authors and Affiliations

  1. Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba, 277-8581, Japan

    Takahiro Ohgoe & Naoki Kawashima

  2. Research Center for Nano-Micro Structure Science and Engineering, Graduate School of Engineering, University of Hyogo, Himeji, Hyogo, 671-2280, Japan

    Takafumi Suzuki

Authors
  1. Takahiro Ohgoe
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  2. Takafumi Suzuki
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  3. Naoki Kawashima
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Correspondence to Takahiro Ohgoe.

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Ohgoe, T., Suzuki, T. & Kawashima, N. Bimodal Momentum Distribution of the High-Density Supersolid State. J Low Temp Phys 171, 309–314 (2013). https://doi.org/10.1007/s10909-012-0794-1

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  • DOI: https://doi.org/10.1007/s10909-012-0794-1

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