Polaron Mobility in the “Beyond Quasiparticles” Regime
Polaron Mobility in the “Beyond Quasiparticles” Regime
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“超越准粒子”体系中的极化子迁移率
DOI：
10.1103/physrevlett.123.076601
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发表时间：
2019
影响因子：
8.6
通讯作者：
Nagaosa, Naoto
中科院分区：
文献类型：
--
作者：
Mishchenko, Andrey S.;Pollet, Lode;Prokof’ev, Nikolay V.;Kumar, Abhishek;Maslov, Dmitrii L.;Nagaosa, Naoto
在许多物理情况下，从极化子到狄拉克液体和非费米液体，人们会遇到“超越准粒子”状态，在这种状态下，非弹性散射率超过准粒子的热能。这种状态下的输运不能用动力学方程来描述。我们采用图解蒙特卡罗方法研究的流动Frohlich极化子在这个政权和发现一些nonperturbative效应:强大的违反Mott-Ioffe-Regel则在中间和强耦合,流动性最低atin强耦合极限(光学模式频率),大量延迟发病指数依赖流动的中间耦合,并完成涂柯克峰的强耦合。在解释具有强电子-声子耦合的材料中的迁移率数据时，应考虑到这些效应。
In a number of physical situations, from polarons to Dirac liquids and to non-Fermi liquids, one encounters the “beyond quasiparticles” regime, in which the inelastic scattering rate exceeds the thermal energy of quasiparticles. Transport in this regime cannot be described by the kinetic equation. We employ the diagrammatic Monte Carlo method to study the mobility of a Fröhlich polaron in this regime and discover a number of nonperturbative effects: a strong violation of the Mott-Ioffe-Regel criterion at intermediate and strong couplings, a mobility minimum atin the strong-coupling limit (is the optical mode frequency), a substantial delay in the onset of an exponential dependence of the mobility forat intermediate coupling, and complete smearing of the Drude peak at strong coupling. These effects should be taken into account when interpreting mobility data in materials with strong electron-phonon coupling.