Susceptibility indicator for chiral topological orders emergent from correlated fermions

Abstract

Chiral topological orders formed in correlated fermion systems have been widely explored. However, the mechanism on how they emerge from interacting fermions is still unclear. Here, we propose a susceptibility condition. Under this condition, we show that chiral topological orders can spontaneously take place in correlated fermion systems. The condition leads to a low-energy effective theory of bosons with strong frustration, mimicking the flat band systems. The frustration then melts the long-range orders and results in topological orders with time-reversal symmetry breaking. We apply the theory to strongly-correlated semiconductors doped to the metallic phase. A novel excitonic topological order with semionic excitations and chiral excitonic edge state is revealed. We also discuss the application to frustrated magnets. The theory predicts a chiral spin liquid state, which is numerically confirmed by our tensor network calculations. These results demonstrate an unprecedented indicator for chiral topological orders, which bridges the existing gap between interacting fermions and correlated topological matter.

22 pages, 6 figures

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Cited by in corpus (5)

• Single-layer framework of variational tensor network states
• Determination of ground states of one-dimensional quantum systems using the cluster iTEBD method
• Grassmann tensor networks
• Correlated phases of moat-band excitons in two dimensions
• Probing universal imaginary-time relaxation critical dynamics with infinite projected entangled pair states