Chiral Sachdev-Ye model: Integrability and chaos of anyons in 1+1d
In: Phys. Rev. B 105, 125109 (2022); (2021)
Online
report
We construct and study a chiral Sachdev-Ye (SY) model consisting of $N$ chiral SU$(M)_1$ Wess-Zumino-Witten (WZW) models with current-current interactions among each other, which generalizes the 0+1d quantum chaotic SY spin model into 1+1d chiral system with anyon excitations. Each WZW model hosts Abelian anyons as charge excitations, and may arise as the chiral edge theory of 2+1d gapped topological phases. We solve the chiral SY model in two limits which show distinct quantum dynamics. The first limit is the case with uniform interactions at any integers $N$ and $M$, which is integrable and decomposes into a chiral SU$(M)_N$ WZW model and its coset with different "speed of light". When $N=M=2$, the model maps to a free Majorana fermion model. The second limit is the large $N$ and $M$ limit with random interactions, which is solvable to the leading $\frac{1}{NM}$ order, and exhibits many-body quantum chaos in the out-of-time-ordered correlation of anyons. As the interaction strength approaches the upper limit preserving the chirality, the leading velocity-dependent Lyapunov exponent of the model saturates the maximal chaos bound $2\pi/\beta$ at temperature $\beta^{-1}$.
Comment: 19 pages, 6 figures
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Chiral Sachdev-Ye model: Integrability and chaos of anyons in 1+1d
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Autor/in / Beteiligte Person: | Hu, Yichen ; Lian, Biao |
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Quelle: | Phys. Rev. B 105, 125109 (2022); (2021) |
Veröffentlichung: | 2021 |
Medientyp: | report |
DOI: | 10.1103/PhysRevB.105.125109 |
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