Optical response of Sr2RuO4 reveals universal fermi-liquid scaling and quasiparticles beyond Landau theory.
Optical response of Sr2RuO4 reveals universal fermi-liquid scaling and quasiparticles beyond Landau theory.
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DOI：
10.1103/physrevlett.113.087404
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发表时间：
2014-03
影响因子：
8.6
通讯作者：
D. Stricker;J. Mravlje;C. Berthod;R. Fittipaldi;A. Vecchione;A. Georges;D. van der Marel
中科院分区：
文献类型：
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作者：
D. Stricker;J. Mravlje;C. Berthod;R. Fittipaldi;A. Vecchione;A. Georges;D. van der Marel
根据费米液体理论，我们测量了Sr（2）RuO（4）中传导电子的低能弛豫速率（1/τ），并证明了它与频率（ω）和温度（T）的关系符合标度关系。在热弛豫状态下，1/τ ε（prognosis ω）（2）+（pπk（B）T）（2），其中p = 2，并且ω/T缩放适用。利用动力学平均场理论的多体电子结构计算证实了低能费米液体标度，并提供了在较高能量和温度下费米液体行为偏离的定量理解。在这一制度中的多余的光谱重量提供了证据，强烈分散的“弹性”准粒子激发以上的费米能量。
We report optical measurements demonstrating that the low-energy relaxation rate (1/τ) of the conduction electrons in Sr(2)RuO(4) obeys scaling relations for its frequency (ω) and temperature (T) dependence in accordance with Fermi-liquid theory. In the thermal relaxation regime, 1/τ ∝ (ħω)(2)+(pπk(B)T)(2) with p = 2, and ω/T scaling applies. Many-body electronic structure calculations using dynamical mean-field theory confirm the low-energy Fermi-liquid scaling and provide quantitative understanding of the deviations from Fermi-liquid behavior at higher energy and temperature. The excess optical spectral weight in this regime provides evidence for strongly dispersing "resilient" quasiparticle excitations above the Fermi energy.