Emergent symmetry in a low-dimensional superconductor on the edge of Mottness.
basic_science · Level V
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- Record sourced from PubMed, PMID 37972183.
- Also identified by DOI 10.1126/science.abp8948.
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Abstract
Upon cooling, condensed-matter systems typically transition into states of lower symmetry. The converse-i.e., the emergence of higher symmetry at lower temperatures-is extremely rare. In this work, we show how an unusually isotropic magnetoresistance in the highly anisotropic, one-dimensional conductor Li<sub>0.9</sub>Mo<sub>6</sub>O<sub>17</sub> and its temperature dependence can be interpreted as a renormalization group (RG) flow toward a so-called separatrix. This approach is equivalent to an emergent symmetry in the system. The existence of two distinct ground states, Mott insulator and superconductor, can then be traced back to two opposing RG trajectories. By establishing a direct link between quantum field theory and an experimentally measurable quantity, we uncover a path through which emergent symmetry might be identified in other candidate materials.