- Tytuł:
- Weakly Bound States in Heterogeneous Waveguides: A Calculation to Fourth Order
- Autorzy:
- Amore, P.
- Powiązania:
- https://bibliotekanauki.pl/articles/1032586.pdf
- Data publikacji:
- 2017-10
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
trapped modes
bound states
deformed waveguide
perturbation theory - Opis:
- We have extended a previous calculation of the energy of a weakly heterogeneous waveguide to fourth order in the density perturbation, deriving its general expression. For particular configurations where the second and third orders both vanish, we discover that the fourth order contribution lowers in general the energy of the state, below the threshold of the continuum. In these cases the waveguide possesses a localized state. We have applied our general formula to a solvable model with vanishing second and third orders reproducing the exact expression for the fourth order.
- Źródło:
-
Acta Physica Polonica A; 2017, 132, 4; 1351-1357
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł