Coherence Factors and Quantum Interferences in Excitonic Condensation of Ta2NiSe5

International Conference on Strongly Correlated Electron Systems 2016

Sugimoto, Koudai^1 ; Kaneko, Tatsuya^2 ; Ohta, Yukinori^2

Center for Frontier Science, Chiba University, Chiba

263-8522, Japan^1

Department of Physics, Chiba University, Chiba

263-8522, Japan^2

关键词: Characteristic peaks;    Coherence factors;    Constructive interference;    Macroscopic quantum;    Magnetic resonance relaxation;    Quantum interference;    Three-chain model;    Ultrasonic attenuation;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/807/11/112001/pdf
DOI  :  10.1088/1742-6596/807/11/112001

来源: IOP

【 摘 要 】

In order to elucidate whether Ta2NiSe5is in an excitonic condensation state or not, we study macroscopic quantum interferences in ultrasonic attenuation rate and nuclear magnetic resonance relaxation rate. Using the three-chain model describing the excitonic condensation of Ta2NiSe5, we demonstrate analytically that the ultrasonic attenuation rate shows a characteristic peak just below the transition temperature of the excitonic condensation, while the nuclear magnetic resonance relaxation rate shows a rapid drop. In particular, we find that the constructive interference originates from the hybridization between the conduction and valence bands induced by an external field.