Number of bound states of the Hamiltonian of a lattice two-boson system with interactions up to the next neighbouring sites
| Autor: | Lakaev, Saidakhmat N., Khamidov, Shakhobiddin I., Akhmadova, Mukhayyo O. |
|---|---|
| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | We study the family $H_{\gamma \lambda \mu}(K)$, $K\in \mathbb{T}^2,$ of discrete Schr\"odinger operators, associated to the Hamiltonian of a system of two identical bosons on the two-dimen\-sional lattice $\mathbb{Z}^2,$ interacting through on one site, nearest-neighbour sites and next-nearest-neighbour sites with interaction magnitudes $\gamma,\lambda$ and $\mu,$ respectively. We prove there existence an important invariant subspace of operator $H_{\gamma \lambda \mu}(0)$ such that the restriction of the operator $H_{\gamma \lambda \mu}(0)$ on this subspace has at most two eigenvalues lying both as below the essential spectrum as well as above it, depending on the interaction magnitude $\lambda,\mu\in \mathbb{R}$ (only). We also give a sharp lower bound for the number of eigenvalues of $H_{\gamma\lambda\mu}(K)$. Comment: 15 pages, 1 figure. arXiv admin note: text overlap with arXiv:2303.10491, arXiv:2304.11610 |
| Databáze: | arXiv |
| Externí odkaz: |
|