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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Interaction-Induced Multiparticle Bound States in the Continuum.

Boning Huang1,2, Yongguan Ke1,2, Honghua Zhong3

  • 1Institute of Quantum Precision Measurement, State Key Laboratory of Radio Frequency Heterogeneous Integration, College of Physics and Optoelectronic Engineering, <a href="https://ror.org/01vy4gh70">Shenzhen University</a>, Shenzhen 518060, China.

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Summary
This summary is machine-generated.

Researchers predict novel multiparticle bound states in the continuum (BICs) within the Bose-Hubbard model. These quasi-BICs exhibit unique behaviors, including Thouless pumping and counter-propagating motion of bound pairs, offering new insights into quantum many-body physics.

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Area of Science:

  • Quantum physics
  • Condensed matter theory
  • Many-body systems

Background:

  • Bound states in the continuum (BICs) are localized states within radiation continua, previously studied for single particles.
  • The existence and nature of BIC analogs in many-body quantum systems, especially with interparticle interactions, remain largely unexplored.

Purpose of the Study:

  • To predict and characterize a novel type of multiparticle state analogous to BICs in the interaction-modulated Bose-Hubbard model.
  • To investigate the behavior of these predicted states under different boundary conditions and explore their potential for quantum phenomena like Thouless pumping.

Main Methods:

  • Theoretical prediction using the interaction-modulated Bose-Hubbard model.
  • Analysis of multiparticle states under periodic and open boundary conditions.
  • Investigation of Thouless pumping by modulating onsite interactions in space and time.

Main Results:

  • Prediction of quasi-BICs, which are bound pairs within a standing wave formed by a third particle.
  • Demonstration that quasi-BICs become eigenstates under open boundary conditions.
  • Realization of Thouless pumping for quasi-BICs, with surprising counter-propagating motion of the bound pair relative to the standing wave.

Conclusions:

  • The study introduces a novel concept of multiparticle BICs in quantum many-body systems.
  • Quasi-BICs exhibit unique topological properties, enabling Thouless pumping with unusual dynamics.
  • These findings open new avenues for exploring quantum phenomena and designing novel quantum devices.