Beyond Topological Invariants: Order Parameters from Dominant Fock-state Patterns

• URL: http://arxiv.org/abs/2605.10320v1
• Date: Mon, 11 May 2026 10:18:45 GMT
• Title: Beyond Topological Invariants: Order Parameters from Dominant Fock-state Patterns
• Abstract summary: We introduce a general scheme for constructing order parameters (OPs) by extracting generic patterns from the dominant Fock states of many-body ground states.<n>These OPs quantify the depth of a phase, and remain robust in characterizing transitions in disordered systems.<n>The presented framework offers a broadly applicable tool for uncovering the phase diagrams of diverse interacting and non-interacting quantum many-body systems.
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• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We introduce a general scheme for constructing order parameters (OPs) by extracting generic patterns from the dominant Fock states of many-body ground states. While topological phases are traditionally characterized by non-local invariants, we demonstrate that our real-space OPs provide a more refined classification. In the extended Su-Schrieffer-Heeger model, we show that the standard winding number is insufficient to fully distinguish all phases; our OPs reveal a hidden sub-structure where each topological sector splits into two distinct phases. Beyond identifying the phase boundaries, these OPs quantify the depth of a phase, and remain robust in characterizing transitions in disordered systems. Furthermore, our approach provides a practical finite-size diagnostic for the Berezinskii-Kosterlitz-Thouless transition in the interacting spin-1/2 XXZ model. The presented framework offers a broadly applicable tool for uncovering the phase diagrams of diverse interacting and non-interacting quantum many-body systems.

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