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https://hdl.handle.net/10356/160012
Title: | Unifying description of the vibrational anomalies of amorphous materials | Authors: | Mahajan, Shivam Ciamarra, Massimo Pica |
Keywords: | Science::Physics | Issue Date: | 2021 | Source: | Mahajan, S. & Ciamarra, M. P. (2021). Unifying description of the vibrational anomalies of amorphous materials. Physical Review Letters, 127(21), 215504-. https://dx.doi.org/10.1103/PhysRevLett.127.215504 | Project: | MOE2019-T1-001-03 | Journal: | Physical Review Letters | Abstract: | The vibrational density of states D(ω) of solids controls their thermal and transport properties. In crystals, the low-frequency modes are extended phonons distributed in frequency according to Debye's law, D(ω)∝ω^{2}. In amorphous solids, phonons are damped, and at low frequency D(ω) comprises extended modes in excess over Debye's prediction, leading to the so-called boson peak in D(ω)/ω^{2} at ω_{bp}, and quasilocalized ones. Here we show that boson peak and phonon attenuation in the Rayleigh scattering regime are related, as suggested by correlated fluctuating elasticity theory, and that amorphous materials can be described as homogeneous isotropic elastic media punctuated by quasilocalized modes acting as elastic heterogeneities. Our numerical results resolve the conflict between theoretical approaches attributing amorphous solids' vibrational anomalies to elastic disorder and localized defects. | URI: | https://hdl.handle.net/10356/160012 | ISSN: | 0031-9007 | DOI: | 10.1103/PhysRevLett.127.215504 | Schools: | School of Physical and Mathematical Sciences | Organisations: | CNRS@CREATE LTD | Rights: | © 2021 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society. | Fulltext Permission: | open | Fulltext Availability: | With Fulltext |
Appears in Collections: | SPMS Journal Articles |
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Unifying Description of the Vibrational Anomalies of Amorphous Materials.pdf | 376.43 kB | Adobe PDF | View/Open |
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