Topological phase transition between non-high symmetry critical phases and curvature function renormalization group

TL;DR

This paper explores topological phase transitions between non-high symmetry critical phases, utilizing curvature function renormalization group methods to characterize edge modes, winding numbers, and multicritical points.

Contribution

It generalizes the understanding of topological transitions to non-HS critical phases and introduces a curvature function RG approach for analyzing these phenomena.

Findings

Identification of trivial and non-trivial non-HS critical phases

Observation of quantized winding number jumps at multicritical points

Development of a curvature function RG method for non-HS criticalities

Abstract

The interplay between topology and criticality has been a recent interest of study in condensed matter physics. A unique topological transition between certain critical phases has been observed as a consequence of the edge modes living at criticalities. In this work, we generalize this phenomenon by investigating possible transitions between critical phases which are non-high symmetry (non-HS) in nature. We find the triviality and non-triviality of these critical phases in terms of the decay length of the edge modes and also characterize them using the winding numbers. The distinct non-HS critical phases are separated by multicritical points with linear dispersion at which the winding number exhibits the quantized jump, indicating a change in the topology (number of edge modes) at the critical phases. Moreover, we reframe the scaling theory based on the curvature function, i.e. curvature function renormalization group method to efficiently address the non-HS criticalities and multicriticalities. Using this we identify the conventional topological transition between gapped phases through non-HS critical points, and also the unique topological transition between critical phases through multicritical points. The renormalization group flow, critical exponents, and correlation function of Wannier states enable the characterization of non-HS criticalities along with multicriticalities.