Abstract
By utilizing terahertz scanning tunneling microscopy (THz-STM) with a carrier envelope phase shifter for broadband THz pulses, we could successfully control the near-field-mediated electron dynamics in a tunnel junction with sub-cycle precision. Measurements of the phase-resolved sub-cycle electron tunneling dynamics revealed an unexpected large carrier-envelope phase shift between far-field and near-field single-cycle THz waveforms.
Highlights
Recent progress on coherent manipulation of electrons under a non-perturbative regime with the carrier-envelope phase (CEP) locked ultrashort pulses holds great promise for overcoming the bandwidth limitation of modern electronics [1]. The development of this lightwave electronics has been stimulated by locally enhanced near-field in nanostructures, and the optical near-field in nanoscale metal tip can be precisely characterized via streaking spectroscopy [2,3]
We observed that the electron tunneling through metallic nanogaps can be accelerated by single-cycle terahertz (THz) electric fields in percolated Au nanostructures [4] and in a single tunnel junction between metal nanoelectrodes [5]
The characterization and active control of THz near-fields in a tunnel junction is indispensable for advancing ultrafast nanoscale manipulation of electrons
Summary
Recent progress on coherent manipulation of electrons under a non-perturbative regime with the carrier-envelope phase (CEP) locked ultrashort pulses holds great promise for overcoming the bandwidth limitation of modern electronics [1]. The development of this lightwave electronics has been stimulated by locally enhanced near-field in nanostructures, and the optical near-field in nanoscale metal tip can be precisely characterized via streaking spectroscopy [2,3].
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