Journal
PHYSICAL REVIEW LETTERS
Volume 116, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.116.213901
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Funding
- European Research Council (ERC) [257531-EnSeNa]
- Canadian Institute for Advanced Research (CIFAR, Quantum Information Science Program)
- German Ministry of Education and Research (Center for Innovation Competence program) [03Z1HN31]
- German Research Foundation (DFG) [SZ276/7-1]
- EPSRC [EP/J019585/1, EP/L01548X/1]
- Lise-Meitner-Fellowship of the Austrian Science Fund (FWF) [M 1849]
- German National Academy of Sciences Leopoldina [LPDR 2014-03]
- Austrian Science Fund (FWF) [M1849] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [M 1849] Funding Source: researchfish
- Engineering and Physical Sciences Research Council [1494652, EP/J019585/1] Funding Source: researchfish
- EPSRC [EP/J019585/1] Funding Source: UKRI
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We present a method of locally inverting the sign of the coupling term in tight-binding systems, by means of inserting a judiciously designed ancillary site and eigenmode matching of the resulting vertex triplet. Our technique can be universally applied to all lattice configurations, as long as the individual sites can be detuned. We experimentally verify this method in laser-written photonic lattices and confirm both the magnitude and the sign of the coupling by interferometric measurements. Based on these findings, we demonstrate how such universal sign-flipped coupling links can be embedded into extended lattice structures to impose a Z(2)-gauge transformation. This opens a new avenue for investigations on topological effects arising from magnetic fields with aperiodic flux patterns or in disordered systems.
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