Hydrodynamic transport and violation of the viscosity-to-entropy ratio bound in nodal-line semimetals

• Published in: Physical review research Vol. 3; no. 3; p. 033003
• Main Authors: Kim, Sang Wook, Jose, Geo, Uchoa, Bruno
• Format: Journal Article
• Language: English
• Published: American Physical Society 01.07.2021

The ratio between the shear viscosity and the entropy η/s is considered a universal measure of the strength of interactions in quantum systems. This quantity was conjectured to have a universal lower bound (1/4π)ℏ/k_{B}, which indicates a very strongly correlated quantum fluid. By solving the quantu...