Abstract:
:Memory metamaterials are artificial media that sustain transformed electromagnetic properties without persistent external stimuli. Previous memory metamaterials were realized with phase-change materials, such as vanadium dioxide or chalcogenide glasses, which exhibit memory behaviour with respect to electrically/optically induced thermal stimuli. However, they require a thermally isolated environment for longer retention or strong optical pump for phase-change. Here we demonstrate electrically programmable nonvolatile memory metadevices realised by the hybridization of graphene, a ferroelectric and meta-atoms/meta-molecules, and extend the concept further to establish reconfigurable logic-gate metadevices. For a memory metadevice having a single electrical input, amplitude, phase and even the polarization multi-states were clearly distinguishable with a retention time of over 10 years at room temperature. Furthermore, logic-gate functionalities were demonstrated with reconfigurable logic-gate metadevices having two electrical inputs, with each connected to separate ferroelectric layers that act as the multi-level controller for the doping level of the sandwiched graphene layer.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Kim WY,Kim HD,Kim TT,Park HS,Lee K,Choi HJ,Lee SH,Son J,Park N,Min Bdoi
10.1038/ncomms10429subject
Has Abstractpub_date
2016-01-27 00:00:00pages
10429issn
2041-1723pii
ncomms10429journal_volume
7pub_type
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