Inversion symmetric two-level systems and the low-temperature universality in disordered solids

Article

关键词: GLASS-TRANSITION TEMPERATURE;    LOW-ENERGY EXCITATIONS;    THERMAL-CONDUCTIVITY;    AMORPHOUS SOLIDS;    TUNNELING STATES;    PHONON ECHOES;    ATTENUATION;    CONNECTION;    CRYSTALS;    SILICON;   

DOI  :  10.1103/PhysRevB.88.174202

来源: SCIE

【 摘 要 】

The low-temperature universal properties in disordered and amorphous solids are considered. We introduce a model that includes two types of two-level systems (TLSs), which, based on their local symmetry, interact weakly or strongly with the phonon field. This accounts well for the experimental results and addresses some long-standing questions: the nature of the TLSs, the smallness and universality of the phonon attenuation, and the energy scale of 3 K below which universality is observed. Our model describes disordered lattices; we also discuss its application to amorphous solids.

【 授权许可】

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