Selective Transmission of Phonons in Molecular Junctions with Nanoscopic Thermal Baths

Leonardo Medrano Sandonas, Álvaro Rodríguez Méndez, Rafael Gutierrez, Jesus M. Ugalde, Vladimiro Mujica, Gianaurelio Cuniberti

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Abstract

A fundamental problem for thermal energy harvesting is the development of atomistic design strategies for smart nanodevices and nanomaterials that can be used to selectively transmit heat. We carry out here an extensive computational study demonstrating that heterogeneous molecular junctions, consisting of molecular wires bridging two different nanocontacts, can act as a selective phonon filter. The most important finding is the appearance of gaps on the phonon transmittance spectrum, which are strongly correlated to the properties of the vibrational spectrum of the specific molecular species in the junction. The filtering effect results from a delicate interplay between the intrinsic vibrational structure of the molecular chains and the different Debye cutoffs of the nanoscopic electrodes used as thermal baths.

Original languageEnglish
Pages (from-to)9680-9687
Number of pages8
JournalJournal of Physical Chemistry C
Volume123
Issue number15
DOIs
Publication statusPublished - Apr 18 2019

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

Medrano Sandonas, L., Rodríguez Méndez, Á., Gutierrez, R., Ugalde, J. M., Mujica, V., & Cuniberti, G. (2019). Selective Transmission of Phonons in Molecular Junctions with Nanoscopic Thermal Baths. Journal of Physical Chemistry C, 123(15), 9680-9687. https://doi.org/10.1021/acs.jpcc.8b11879