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Wu, P.*; 村井 直樹; Li, T.*; 梶本 亮一; 中村 充孝; 古府 麻衣子; 中島 健次; Xia, K.*; Peng, K.*; Zhang, Y.*; et al.
New Journal of Physics (Internet), 25(1), p.013032_1 - 013032_11, 2023/01
被引用回数：0 パーセンタイル：0(Physics, Multidisciplinary)The understanding of the lattice dynamics is essential for engineering the thermal transport properties in quantum materials. Based on the canonical point of view, acoustic phonons are believed to be the principal thermal carriers in heat flow. Here, in this work, optical phonons are elucidated to play a pivotal role in determining the lattice thermal conductivity in thermoelectric material SnS by using the state-of-the-art inelastic neutron scattering technique combined with first-principles calculations. Additionally, in contrast to acoustic phonons, optical phonons are observed to exhibit pronounced softening and broadening with temperature. Our observations not only shed light on the significance of the optical phonons in thermal transport but also provide a vital clue to suppress the propagation of optical phonons to optimize the thermoelectric performance of SnS.
-wave fully charmed tetraquark resonant statesWang, G.-J.*; Meng, Q.*; 岡 眞
Physical Review D, 106(9), p.096005_1 - 096005_9, 2022/11
被引用回数：13 パーセンタイル：85.19(Astronomy & Astrophysics)クォーク模型を用いて、チャームクォークの4体系であるテトラクォークのS波の共鳴状態の探索を行った。複素スケーリング法を用いた計算でスピンーパリティが
, 
, 
の各チャネルに2個ずつ共鳴が存在することを明らかにした。しかし、これらの共鳴は最近の実験で見つかった
と比べると100MeV近く高いところに存在していることが解った。
Meng, Q.*; 原田 正康*; 肥山 詠美子; 保坂 淳; 岡 眞
Physics Letters B, 824, p.136800_1 - 136800_5, 2022/01
被引用回数：16 パーセンタイル：96.85(Astronomy & Astrophysics)ダブルヘビーテトラクォークのスペクトルを計算した。
pentaquark states predicted by a quark modelMeng, Q.*; 肥山 詠美子*; Can, K. U.*; Gubler, P.; 岡 眞; 保坂 淳; Zong, H.*
Physics Letters B, 798, p.135028_1 - 135028_8, 2019/11
被引用回数：0Several compact pentaquark resonances are predicted in a potential quark model. The Hamiltonian is the best available one, which reproduces the masses of the low-lying charmed and strange hadrons well. Full five-body calculations are carried out by the use of the Gaussian expansion method, and the relevant baryon-meson thresholds are taken into account explicitly. Employing the real scaling method, we predict four sharp resonances, 
(
= 5180 MeV, 
= 20 MeV) and others. These are the candidates of compact pentaquark resonance states from the current best quark model, which should be confirmed either by experiments or lattice QCD calculations.
