Journal
NANO LETTERS
Volume 18, Issue 8, Pages 5198-5204Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b02161
Keywords
THz-STM; single-cycle near field; light-field-driven process; ultrafast; ultrasmall
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Funding
- Japan Society for the Promotion of Science [16H04001, 16H06010, 18H04288, 17J05234]
- Ministry of Education, Culture, Sports, Science and Technology
- Japan Ministry of Internal Affairs and Communications [145003103]
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Light-field-driven processes occurring under conditions far beyond the diffraction limit of the light can be manipulated by harnessing spatiotemporally tunable near fields. A tailor-made carrier envelope phase in a tunnel junction formed between nanogap electrodes allows precisely controlled manipulation of these processes. In particular, the characterization and active control of near fields in a tunnel junction are essential for advancing elaborate manipulation of light-field-driven processes at the atomic-scale. Here, we demonstrate that desirable phasecontrolled near fields can be produced in a tunnel junction via terahertz scanning tunneling microscopy (THz-STM) with a phase shifter. Measurements of the phase-resolved subcycle electron tunneling dynamics revealed an unexpected large carrier-envelope phase shift between far-field and near-field single-cycle THz waveforms. The phase shift stems from the wavelength-scale feature of the tip-sample configuration. By using a dual-phase double-pulse scheme, the electron tunneling was coherently manipulated over the femtosecond time scale. Our new prescription-in situ tailoring of single-cycle THz near fields in a tunnel junction-will offer unprecedented control of electrons for ultrafast atomic-scale electronics and metrology.
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