Mertelj T, Oslak A, Dolinsek J, Fisher I R, Kabanov V V, Mihailovic D
Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia and Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 21, 1000 Ljubljana, Slovenia.
Phys Rev Lett. 2009 Feb 27;102(8):086405. doi: 10.1103/PhysRevLett.102.086405.
We measured the temperature and fluence dependence of the time-resolved photoinduced optical reflectivity in a decagonal Al71.9Ni11.1Co17.0 quasicrystal. We find no evidence for the relaxation of a hot thermalized electron gas as observed in metals. Instead, a quick diffusion of the hot nonthermal carriers approximately 40 nm into the bulk is detected, enhanced by the presence of a broad pseudogap. From the relaxation dynamics we find evidence for the suppression of the electronic density of states (DOS) at the Fermi energy with respect to the electronic DOS at approximately 13 meV away from the Fermi energy which is consistent with recent theoretical calculations.
我们测量了十边形Al71.9Ni11.1Co17.0准晶中时间分辨光致光学反射率的温度和能量密度依赖性。我们没有发现像在金属中观察到的那样热热化电子气弛豫的证据。相反，检测到热的非热载流子在大约40纳米范围内迅速扩散到体相中，这是由一个宽的赝能隙的存在所增强的。从弛豫动力学中，我们发现相对于远离费米能量约13毫电子伏特处的电子态密度（DOS），费米能量处的电子态密度受到抑制的证据，这与最近的理论计算一致。
