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arxiv 2410.19020 v1 pith:6ATBPVW2 submitted 2024-10-24 cond-mat.quant-gas quant-ph

Edge state behavior of interacting Bosons in a Su-Schrieffer-Heeger lattice

classification cond-mat.quant-gas quant-ph
keywords algorithmbosonshamiltonianstatestatessystemboundarycold
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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In the low momentum regime, the Su-Schrieffer-Heeger (SSH) model's key characteristics are encapsulated by a Dirac-type Hamiltonian in continuum space, i.e., the localized states emerge at the boundaries. Building on this, we have developed an effective Hamiltonian to model ultra cold interacting Bosons on an SSH like lattice through variational minimization under the mean field approximation. To pinpoint the boundary states, we have developed an algorithm by generalizing the imaginary time propagator, where a initial state evolves under the squared Hamiltonian to converge to the targeted state. This algorithm has broader applicability, enabling the identification of specific eigenstates in various contexts. Furthermore, we draw a parallel to an experimentally physical setup involving a gas of ultra cold Bosons confined to an array of potential wells with alternating depths. By establishing the system's analogy with the SSH system, we apply our algorithm to investigate boundary states in the presence of interaction, demonstrating how these findings align with those of the continuous system.

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