Anderson Localization Quenches Thermal Transport in Aperiodic Superlattices

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Anderson Localization Quenches Thermal Transport in Aperiodic Superlattices. / Juntunen, Taneli; Vänskä, Osmo; Tittonen, Ilkka.

In: Physical Review Letters, Vol. 122, No. 10, 105901, 12.03.2019.

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@article{2ed318892b5d4494b1ed89099b23fcf8,
title = "Anderson Localization Quenches Thermal Transport in Aperiodic Superlattices",
abstract = "We show that aperiodic superlattices exhibit intriguing interplay between phononic coherent wave interference effects and incoherent transport. In particular, broadband Anderson localization results in a drastic thermal conductivity reduction of 98{\%} at room temperature, providing an ultralow value of 1.3 W m-1 K-1, and further yields an anomalously large thermal anisotropy ratio of ∼102 in aperiodic Si/Ge superlattices. A maximum in the thermal conductivity emerges as an unambiguous consequence of phonon Anderson localization at a system length scale bridging the extended and localized transport regimes. The frequency-resolved picture, combined with our lattice dynamical description of Anderson localization, elucidates the rich transport characteristics in these systems and the potential of correlated disorder for sub- to few-THz phononic engineering of heat transport in thermoelectric applications.",
author = "Taneli Juntunen and Osmo V{\"a}nsk{\"a} and Ilkka Tittonen",
note = "| openaire: EC/H2020/645241/EU//TransFlexTeg",
year = "2019",
month = "3",
day = "12",
doi = "10.1103/PhysRevLett.122.105901",
language = "English",
volume = "122",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "10",

}

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TY - JOUR

T1 - Anderson Localization Quenches Thermal Transport in Aperiodic Superlattices

AU - Juntunen, Taneli

AU - Vänskä, Osmo

AU - Tittonen, Ilkka

N1 - | openaire: EC/H2020/645241/EU//TransFlexTeg

PY - 2019/3/12

Y1 - 2019/3/12

N2 - We show that aperiodic superlattices exhibit intriguing interplay between phononic coherent wave interference effects and incoherent transport. In particular, broadband Anderson localization results in a drastic thermal conductivity reduction of 98% at room temperature, providing an ultralow value of 1.3 W m-1 K-1, and further yields an anomalously large thermal anisotropy ratio of ∼102 in aperiodic Si/Ge superlattices. A maximum in the thermal conductivity emerges as an unambiguous consequence of phonon Anderson localization at a system length scale bridging the extended and localized transport regimes. The frequency-resolved picture, combined with our lattice dynamical description of Anderson localization, elucidates the rich transport characteristics in these systems and the potential of correlated disorder for sub- to few-THz phononic engineering of heat transport in thermoelectric applications.

AB - We show that aperiodic superlattices exhibit intriguing interplay between phononic coherent wave interference effects and incoherent transport. In particular, broadband Anderson localization results in a drastic thermal conductivity reduction of 98% at room temperature, providing an ultralow value of 1.3 W m-1 K-1, and further yields an anomalously large thermal anisotropy ratio of ∼102 in aperiodic Si/Ge superlattices. A maximum in the thermal conductivity emerges as an unambiguous consequence of phonon Anderson localization at a system length scale bridging the extended and localized transport regimes. The frequency-resolved picture, combined with our lattice dynamical description of Anderson localization, elucidates the rich transport characteristics in these systems and the potential of correlated disorder for sub- to few-THz phononic engineering of heat transport in thermoelectric applications.

UR - http://www.scopus.com/inward/record.url?scp=85062942375&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.122.105901

DO - 10.1103/PhysRevLett.122.105901

M3 - Article

VL - 122

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 10

M1 - 105901

ER -

ID: 32707111