Artículo
Abstract:
Elementary excitations in rather thick symmetric films of liquid (Formula presented) at T=0 K are investigated. They are characterized by a momentum ħq parallel to the surface and may be described by bound or continuum states, which are obtained by solving a Bogoliubov-type equation formulated within the framework of the paired-phonon analysis and the hypernetted-chain approximation. Films of coverages (Formula presented)=0.3 and 0.4 A(Formula presented) confined by simple Gaussian potentials are studied. The excitation spectrum is numerically evaluated by discretizing the associated eigenvalue problem in a finite box. The evolution of the energy levels as a function of the box size is explored. Examples of the calculated energies and wave functions are displayed in a series of figures. Two differing sorts of continuum states may be distinguished. Depending on the behavior of their excitation energies as a function of the box size on the one hand, and the spatial distribution of their wave functions inside the film and in the asymptotic region far apart from the interface layer on the other, the continuum solutions can be separated into two classes of excitations: (a) the “regular” continuum states and (b) the “resonant modes.” The matrix elements of the particle-hole potential and the penetration factors of the most important states are examined. The lowest-lying branch of states is always bound and for q<(Formula presented) ((Formula presented)≃1.9 A(Formula presented) being the momentum at the roton minimum) it describes surface ripplon excitations. In the atomic scale regime, 1.1 A(Formula presented)
Registro:
| Documento: | Artículo |
| Título: | Properties of bound, resonant, and regular continuum states of the excitation spectrum of symmetric liquid films at T=0 K |
| Autor: | Szybisz, L. |
| Filiación: | Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, RA-1428 Buenos Aires, Argentina |
| Año: | 1996 |
| Volumen: | 53 |
| Número: | 10 |
| Página de inicio: | 6705 |
| Página de fin: | 6724 |
| DOI: | http://dx.doi.org/10.1103/PhysRevB.53.6705 |
| Título revista: | Physical Review B - Condensed Matter and Materials Physics |
| Título revista abreviado: | Phys. Rev. B Condens. Matter Mater. Phys. |
| ISSN: | 10980121 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v53_n10_p6705_Szybisz |
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Citas:
---------- APA ----------
(1996) . Properties of bound, resonant, and regular continuum states of the excitation spectrum of symmetric liquid films at T=0 K. Physical Review B - Condensed Matter and Materials Physics, 53(10), 6705-6724.http://dx.doi.org/10.1103/PhysRevB.53.6705
---------- CHICAGO ----------
Szybisz, L. "Properties of bound, resonant, and regular continuum states of the excitation spectrum of symmetric liquid films at T=0 K" . Physical Review B - Condensed Matter and Materials Physics 53, no. 10 (1996) : 6705-6724.http://dx.doi.org/10.1103/PhysRevB.53.6705
---------- MLA ----------
Szybisz, L. "Properties of bound, resonant, and regular continuum states of the excitation spectrum of symmetric liquid films at T=0 K" . Physical Review B - Condensed Matter and Materials Physics, vol. 53, no. 10, 1996, pp. 6705-6724.http://dx.doi.org/10.1103/PhysRevB.53.6705
---------- VANCOUVER ----------
Szybisz, L. Properties of bound, resonant, and regular continuum states of the excitation spectrum of symmetric liquid films at T=0 K. Phys. Rev. B Condens. Matter Mater. Phys. 1996;53(10):6705-6724.http://dx.doi.org/10.1103/PhysRevB.53.6705
