AI Article Synopsis
- Bound states in the continuum (BICs) are localized modes within radiation continuum, first predicted for single particles but now general in many wave systems; their application in many-body quantum physics is still largely unexplored.
- Researchers predict a new type of multiparticle state in the Bose-Hubbard model, creating a quasi-BIC that behaves differently under various boundary conditions—appearing as a bound pair influenced by a third particle.
- The study reveals that modulating onsite interactions can realize Thouless pumping of these quasi-BICs, where the overall center of mass shifts while the bound pair moves oppositely in relation to a standing wave.
Article Abstract
Bound states in the continuum (BICs) are localized modes residing in the radiation continuum. They were first predicted for single-particle states, and became a general feature of many wave systems. In many-body quantum physics, it is still unclear what would be a close analog of BICs, and whether interparticle interaction may induce BICs. Here, we predict a novel type of multiparticle states in the interaction-modulated Bose-Hubbard model that can be associated with the BIC concept. Under periodic boundary conditions, a so-called quasi-BIC appears as a bound pair residing in a standing wave formed by the third particle. Under open boundary conditions, such a hybrid state becomes an eigenstate of the system. We demonstrate that the Thouless pumping of the quasi-BICs can be realized by modulating the onsite interactions in space and time. Surprisingly, while the center of mass of the quasi-BIC is shifted by a unit cell in one cycle, the bound pair moves in the opposite direction with the standing wave.
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| http://dx.doi.org/10.1103/PhysRevLett.133.140202 | DOI Listing |
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