Abstract:
:Topological quantum matter can be realized by subjecting engineered systems to time-periodic modulations. In analogy with static systems, periodically driven quantum matter can be topologically classified by topological invariants, whose non-zero value guarantees the presence of robust edge modes. In the high-frequency limit of the drive, topology is described by standard topological invariants, such as Chern numbers. Away from this limit, these topological numbers become irrelevant, and novel topological invariants must be introduced to capture topological edge transport. The corresponding edge modes were coined anomalous topological edge modes, to highlight their intriguing origin. Here we demonstrate the experimental observation of these topological edge modes in a 2D photonic lattice, where these propagating edge states are shown to coexist with a quasi-localized bulk. Our work opens an exciting route for the exploration of topological physics in time-modulated systems operating away from the high-frequency regime.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Mukherjee S,Spracklen A,Valiente M,Andersson E,Öhberg P,Goldman N,Thomson RRdoi
10.1038/ncomms13918subject
Has Abstractpub_date
2017-01-04 00:00:00pages
13918issn
2041-1723pii
ncomms13918journal_volume
8pub_type
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