講演情報
[19p-D62-12]Optimizing cryogenic graphene: how Golomb ruler-designed isotope interfaces suppress thermal transport
〇(P)Xin Wu1,2, Zheyong Fan3, Sebastian Volz1,4, Qiang Han2, Masahiro Nomura1 (1.Univ. of Tokyo, 2.SCUT, 3.Bohai Univ., 4.LIMMS)
キーワード：
Cryogenic thermal property、Golomb ruler、Isotope interface
The Golomb ruler, a mathematic concept, is a set of marks at integer positions along a ruler such that no two pairs of marks are the same distance apart. Applying this concept to physics may shed light on some entirely new phenomena, especially in some optimization problems.
Driven by strong impetus, the need for thermal management at cryogenic temperatures is rapidly emerging in several fields including quantum computing, quantum communication, life sciences, etc. In this work, inspired by the Golomb ruler sequence, graphene nanoribbons containing linear isotope interfaces were constructed, and efficient suppression of phonon thermal transport was achieved at a cryogenic temperature of 20 K. Compared with other sequences such as Equidistant and Fibonacci, the extremely strong disordering of the Golomb ruler sequence makes the isotope interfaces have a stronger scattering and confinement effect on the phonon transport. The isotope interfaces arranged according to the Golomb ruler sequence greatly impede the phonon transport over a wide spectral range. Through phonon analysis of a pair of systems, based on a Golomb ruler and an equidistant structure, the results indicated that the difference in the phonon mean free path (MFP) of low-frequency out-of-plane phonons is a crucial factor for the difference in thermal conductivity. This effect is notably pronounced at cryogenic temperatures where phonon energies are lower, otherwise, higher phonon energies render phonon transport less sensitive to differences in isotopic interface positions. Furthermore, the isotope interface density and doping ratio have no significant impact on thermal conductivity at cryogenic temperatures.
This study provides valuable insights into cryogenic thermal management and is expected to inspire extensive theoretical research and practical micro-nano applications.
Driven by strong impetus, the need for thermal management at cryogenic temperatures is rapidly emerging in several fields including quantum computing, quantum communication, life sciences, etc. In this work, inspired by the Golomb ruler sequence, graphene nanoribbons containing linear isotope interfaces were constructed, and efficient suppression of phonon thermal transport was achieved at a cryogenic temperature of 20 K. Compared with other sequences such as Equidistant and Fibonacci, the extremely strong disordering of the Golomb ruler sequence makes the isotope interfaces have a stronger scattering and confinement effect on the phonon transport. The isotope interfaces arranged according to the Golomb ruler sequence greatly impede the phonon transport over a wide spectral range. Through phonon analysis of a pair of systems, based on a Golomb ruler and an equidistant structure, the results indicated that the difference in the phonon mean free path (MFP) of low-frequency out-of-plane phonons is a crucial factor for the difference in thermal conductivity. This effect is notably pronounced at cryogenic temperatures where phonon energies are lower, otherwise, higher phonon energies render phonon transport less sensitive to differences in isotopic interface positions. Furthermore, the isotope interface density and doping ratio have no significant impact on thermal conductivity at cryogenic temperatures.
This study provides valuable insights into cryogenic thermal management and is expected to inspire extensive theoretical research and practical micro-nano applications.
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