Experimental test of universal conductance fluctuations by means of wave-chaotic microwave cavities

作     者：Sameer Hemmady James Hart Xing Zheng Thomas M. Antonsen, Jr. Edward Ott Steven M. Anlage 

作者机构：Department of Physics University of Maryland College Park Maryland 20742-4111 USA Department of Electrical and Computer Engineering University of Maryland College Park Maryland 20742-3285 USA Institute for Research in Electronics and Applied Physics University of Maryland College Park Maryland 20742-3511 USA Center for Superconductivity Research University of Maryland College Park Maryland 20742-4111 USA 

出 版 物：《Physical Review B》 (Phys. Rev. B Condens. Matter Mater. Phys.)

年 卷 期：2006年第74卷第19期

页      面：195326-195326页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

摘      要：The mathematical equivalence of the time-independent Schrödinger equation and the Helmholtz equation is exploited to provide a means of studying universal conductance fluctuations in ballistic chaotic mesoscopic systems using a two-dimensional microwave cavity. The classically chaotic ray trajectories within a suitably shaped microwave cavity play a role analogous to that of the chaotic dynamics of noninteracting electron transport through a ballistic quantum dot in the absence of thermal fluctuations. The microwave cavity is coupled through two single-mode ports and the effect of nonideal coupling between the ports and cavity is removed by a previously developed method based on the measured radiation impedance matrix. The Landauer-Büttiker formalism is applied to obtain the conductance of a corresponding mesoscopic quantum-dot device. We find good agreement for the probability density functions of the experimentally derived surrogate conductance, as well as its mean and variance, with the theoretical predictions of Brouwer and Beenakker. We also observe a linear relation between the quantum dephasing parameter and the cavity ohmic loss parameter.