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Topological Knots in Quantum Spin Systems |
| X. M. Yang , L. Jin*, and Z. Song* |
| School of Physics, Nankai University, Tianjin 300071, China |
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| Cite this article: |
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X. M. Yang , L. Jin, and Z. Song 2021 Chin. Phys. Lett. 38 060302 |
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Abstract Knot theory provides a powerful tool for understanding topological matters in biology, chemistry, and physics. Here knot theory is introduced to describe topological phases in a quantum spin system. Exactly solvable models with long-range interactions are investigated, and Majorana modes of the quantum spin system are mapped into different knots and links. The topological properties of ground states of the spin system are visualized and characterized using crossing and linking numbers, which capture the geometric topologies of knots and links. The interactivity of energy bands is highlighted. In gapped phases, eigenstate curves are tangled and braided around each other, forming links. In gapless phases, the tangled eigenstate curves may form knots. Our findings provide an alternative understanding of phases in the quantum spin system, and provide insights into one-dimension topological phases of matter.
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Received: 26 February 2021
Published: 25 May 2021
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| Fund: Supported by the National Natural Science Foundation of China (Grants Nos. 11874225, 11975128, and 11605094). |
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