Minimizing Coherent Thermal Conductance by Controlling the Periodicity of Two-Dimensional Phononic Crystals
Tian, Y., Puurtinen, T. A., Geng, Z., & Maasilta, I. J. (2019). Minimizing Coherent Thermal Conductance by Controlling the Periodicity of Two-Dimensional Phononic Crystals. Physical Review Applied, 12(1), Article 014008. https://doi.org/10.1103/physrevapplied.12.014008
Julkaistu sarjassa
Physical Review AppliedPäivämäärä
2019Tekijänoikeudet
© 2019 American Physical Society
Periodic hole-array phononic crystals (PnCs) can strongly modify phonon dispersion relations and have been shown to influence thermal conductance coherently, especially at low temperatures where bulk scattering is suppressed. One very important parameter influencing this effect is the period of the structure. Here, we measure the subkelvin thermal conductance of nanofabricated PnCs with identical hole-filling factors but three different periodicities, of 4, 8, and 16μm, using superconducting tunnel-junction thermometry. We find that all the measured samples can suppress thermal conductance by an order of magnitude and have a lower thermal conductance than the previously measured smaller-period 1-μm and 2.4-μm structures. The 8-μm-period PnC gives the lowest thermal conductance of all the above samples and has the lowest specific conductance per unit heater length observed to date in PnCs. In contrast, coherent transport theory predicts that the longest period should have the lowest thermal conductance. Comparison with incoherent simulations suggests that diffusive boundary scattering is likely the mechanism behind the partial breakdown of the coherent theory.
...
Julkaisija
American Physical SocietyISSN Hae Julkaisufoorumista
2331-7019Julkaisu tutkimustietojärjestelmässä
https://converis.jyu.fi/converis/portal/detail/Publication/31392941
Metadata
Näytä kaikki kuvailutiedotKokoelmat
Rahoittaja(t)
Suomen AkatemiaRahoitusohjelmat(t)
Akatemiahanke, SALisätietoja rahoituksesta
This study was supported by the Academy of Finland Project Number 298667 and the China Scholarship Council. We thank C. Dames and G. Wehmeyer for sharing the Monte Carlo code. The computational facilities provided by the CSC-IT Center for Science Ltd. are acknowledged.Lisenssi
Samankaltainen aineisto
Näytetään aineistoja, joilla on samankaltainen nimeke tai asiasanat.
-
Controlling thermal conductance using three-dimensional phononic crystals
Heiskanen, Samuli; Puurtinen, Tuomas A.; Maasilta, Ilari J. (AIP Publishing, 2021)Controlling thermal transport at the nanoscale is vital for many applications. Previously, it has been shown that this control can be achieved with periodically nanostructured two-dimensional phononic crystals for the case ... -
Studies of two-dimensional and three-dimensional phononic crystal structures
Tian, Yolan (University of Jyväskylä, 2016)This thesis focuses on studying phononic crystal structures. More specifically, it is aimed at fabrication and measurement of thermal properties of two-dimensional (2D) periodic microstructures and three-dimensional (3D) ... -
Thermal conductance of pillar-based phononic crystals at sub-Kelvin temperatures
Korkiamäki, Tatu (2020)Fononikide on keinotekoinen periodinen rakenne yhdessä, kahdessa tai kolmessa ulottuvuudessa, joka vaikuttaa fononien eli elastisten aaltojen kvanttien etenemiseen. Koska lämmön johtuminen eristeissä ja puolijohteissa ... -
Engineering thermal conductance using a two-dimensional phononic crystal
Zen, Nobuyuki; Puurtinen, Tuomas; Isotalo, Tero; Chaudhuri, Saumyadip; Maasilta, Ilari (Nature Publishing Group, 2014)Abstract. Controlling thermal transport has become relevant in recent years. Traditionally, this control has been achieved by tuning the scattering of phonons by including various types of scattering centres in the material ... -
Computational and theoretical studies on lattice thermal conductivity and thermal properties of silicon clathrates
Härkönen, Ville (University of Jyväskylä, 2016)The lattice thermal conductivity is usually an intrinsic property in the study of thermoelectricity. In particular, relatively low lattice thermal conductivity is usually a desired feature when higher thermoelectric efficiency ...
Ellei toisin mainittu, julkisesti saatavilla olevia JYX-metatietoja (poislukien tiivistelmät) saa vapaasti uudelleenkäyttää CC0-lisenssillä.