期刊
NPJ QUANTUM INFORMATION
卷 6, 期 1, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/s41534-020-0253-9
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资金
- UK Engineering and Physical Sciences Research Council [EP/M009564/1]
- EPSRC strategic equipment grant [EP/L02263X/1]
- EPSRC [EP/M009564/1, EP/L02263X/1] Funding Source: UKRI
Motivated by recent advances in fabricating artificial lattices in semiconductors and their promise for quantum simulation of topological materials, we study the one-dimensional dimerized Fermi-Hubbard model. We show how the topological phases at half-filling can be characterized by a reduced Zak phase defined based on the reduced density matrix of each spin subsystem. Signatures of bulk-boundary correspondence are observed in the triplon excitation of the bulk and the edge states of uncoupled spins at the boundaries. At quarter-filling, we show that owing to the presence of the Hubbard interaction the system can undergo a transition to the topological ground state of the non-interacting Su-Schrieffer-Heeger model with the application of a moderate-strength external magnetic field. We propose a robust experimental realization with a chain of dopant atoms in silicon or gate-defined quantum dots in GaAs where the transition can be probed by measuring the tunneling current through the many-body state of the chain.
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