Kavli Affiliate: Joel E. Moore
| First 5 Authors: T. R. Devidas, Dror Yahav, Jonathan T. Reichanadter, Shannon C. Haley, Matan Sterenberg
| Summary:
Materials that transition between metal and insulator, the two main states
that distinguish all solids, are fascinating because they underlie many
mysteries at the frontier of solid state physics. In 1T-TaS$_{2}$, the
metal-insulator transition is linked to a metastable hidden state arising
within a chiral charge density wave (CDW) whose basic nature remains an open
question. In this work, we show that pulses of current through these materials
create current-carrying filamentary channels that distinguish the ‘metallic’
hidden state and ‘insulating’ CDW states. These channels have remained dark to
previous measurements, and yet are directly linked to the properties of the
hidden state. We leverage the metastability of these conduction channels to
demonstrate electrical control of their creation, erasure and location. Our
findings show that physical elements, such as boundaries and interfaces, play a
key role in the properties of the hidden state characterizing the
metal-insulator transition. We suggest new possibilities for in-situ electrical
design of synaptic components with possible applications to neuromorphic
computing.
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