"A source of" large auditorium graduate academic lectures

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Lecture time: 2016 Nian 3 Yue 3 Ri (Xingqi Si) at 2: 30-4: 30

Venue: Southwest Jiaotong University Campus Guri Electric Hall Institute of Physics Conference Room (3223A)

A lecture topic: Wilson Ratio and Quantum Liquid

Lectures Introduction:
   In a wide variety of materials, its low-temperature phases could be characterized by some dimensionless ratios such as the Wilson ratio (WR). In this talk we show that the phases of many-body interacting multi-component quantum liquids in one dimension can be described by WRs based on the compressibility, susceptibility and specific heat associated with each component. These WRs arise due to surprisingly simple additivity rules within subsystems reminiscent of the rules for multi-resistor networks in series and parallel. Using experimentally realized multi-species cold atomic gases as examples, we prove that the Wilson ratios uniquely identify phases of Tomonaga-Luttinger liquids, while providing universal scaling relations at the boundaries between phases. Their values within a phase identify the internal degrees of freedom of said phase such as its spin-degeneracy. This finding reveals deep physical insights into recent experimental measurements of the universal thermodynamics in ultracold atoms and spins.

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