000009075 001__ 9075 000009075 005__ 20250129094248.0 000009075 0247_ $$2DOI$$a10.1103/PhysRevB.81.054208 000009075 0247_ $$2WOS$$aWOS:000274998000042 000009075 0247_ $$2Handle$$a2128/10997 000009075 037__ $$aPreJuSER-9075 000009075 041__ $$aeng 000009075 082__ $$a530 000009075 084__ $$2WoS$$aPhysics, Condensed Matter 000009075 1001_ $$0P:(DE-Juel1)131067$$aZorn, R.$$b0$$uFZJ 000009075 245__ $$aThe boson peak in confined disordered system 000009075 260__ $$aCollege Park, Md.$$bAPS$$c2010 000009075 300__ $$a054208 000009075 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article 000009075 3367_ $$2DataCite$$aOutput Types/Journal article 000009075 3367_ $$00$$2EndNote$$aJournal Article 000009075 3367_ $$2BibTeX$$aARTICLE 000009075 3367_ $$2ORCID$$aJOURNAL_ARTICLE 000009075 3367_ $$2DRIVER$$aarticle 000009075 440_0 $$04919$$aPhysical Review B$$v81$$x1098-0121$$y5 000009075 500__ $$aRecord converted from VDB: 12.11.2012 000009075 520__ $$aThe vibrational density of states (VDOS) of disordered systems shows a low-frequency excess, the so-called boson peak. Experiments show a change in the shape of the boson peak when the systems are spatially confined. Depending on the type of confinement (hard or soft) the low-frequency wing of the boson peak is either suppressed or enhanced. Here, a simple model, a crystalline system with disordered nearest-neighbor force constants, is studied with boundary conditions mimicking the confinement. The VDOS calculated by numerical diagonalization shows qualitatively the same confinement effect as the experiment. In this model, the effect is a consequence of modes of the bulk system being shifted up or down for hard and soft confinement, respectively. 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