English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Recently, asymmetric plasmonic nanojunctions [Karnetzky et. al., Nature Comm.2471, 9 (2018)] have shown promise as on-chip electronic devices to convertfemtosecond optical pulses to current bursts, with a bandwidth ofmulti-terahertz scale, although yet at low temperatures and pressures. Suchnanoscale devices are of great interest for novel ultrafast electronics andopto-electronic applications. Here, we operate the device in air and at roomtemperature, revealing the mechanisms of photoemission from plasmonicnanojunctions, and the fundamental limitations on the speed ofoptical-to-electronic conversion. Inter-cycle interference of coherentelectronic wavepackets results in a complex energy electron distribution andbirth of multiphoton effects. This energy structure, as well as reshaping ofthe wavepackets during their propagation from one tip to the other, determinethe ultrafast dynamics of the current. We show that, up to some level ofapproximation, the electron flight time is well-determined by the meanponderomotive velocity in the driving field.

Femtosecond field-driven on-chip unidirectional electronic currents in nonadiabatic tunnelling regime