Tailoring Single-Cycle Near Field in a Tunnel Junction with Carrier-Envelope Phase-Controlled Terahertz Electric Fields

Yoshioka, Katsumasa; Katayama, Ikufumi; Arashida, Yusuke; Ban, Atsuhiko; Kawada, Y.; Konishi, Kuniaki; Takahashi, H.; Takeda, Jun

doi:10.1021/acs.nanolett.8b02161

Cited by 52 publications

(69 citation statements)

References 49 publications

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“…The control strategy reported here and based on the dc bias applied between the antenna arms operates simultaneously with earlier studied coherent control using the CEP of the incident pulse [23,35,36]. Our study thus establishes a conceptual basis to extend the application of static or THz fields beyond the control of electron (photo)emission from metallic tips [14][15][16][17][18][19] and electron tunneling [37][38][39]. Along with dielectric, semiconductor [40][41][42][43], graphene-based [20,44], and tunneling [36] structures, the theoretical and experimental realization demonstrated here, analog to an ultrafast rectifying vacuum diode (see also [31]), paves the way towards petahertz electronics [45].…”

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confidence: 56%

Active control of ultrafast electron dynamics in plasmonic gaps using an applied bias

et al. 2020

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In this joint experimental and theoretical study we demonstrate coherent control of the optical field emission and electron transport in plasmonic gaps subjected to intense single-cycle laser pulses. Our results show that an external THz field or a minor dc bias, orders of magnitude smaller than the optical bias owing to the laser field, allows one to modulate and direct the electron photocurrents in the gap of a connected nanoantenna operating as an ultrafast nanoscale vacuum diode for lightwave electronics. Using time-dependent density functional theory calculations we elucidate the main physical mechanisms behind the observed effects and show that an applied dc field significantly modifies the optical field emission and quiver motion of photoemitted electrons within the gap. The quantum many-body theory reproduces the measured net electron transport in the experimental device, which allows us to establish a paradigm for controlling nanocircuits at petahertz frequencies.

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confidence: 56%

Active control of ultrafast electron dynamics in plasmonic gaps using an applied bias

et al. 2020

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“…In the present work, using THz-STM coupled with a CEP shifter for broadband THz pulses [9], we demonstrate that desirable phase-controlled THz near-fields can be produced in a tunnel junction [10]. Measurements of the phase-resolved sub-cycle electron tunneling dynamics revealed a large CEP shift between the THz far-and near-field waveforms.…”

Section: Introductionmentioning

confidence: 65%

“…2(b), the bidirectional sub-picosecond electron burst was generated by adjusting the CEP-controlled pulse to yield a sinusoidal near-field in the junction. Furthermore, we found that the timing and direction of ultrafast electron burst can be manipulated over the femtosecond timescale by actively control the THz near-field with precisely adjusting the CEP of CEP-controlled pulse [10].…”

Section: Resultsmentioning

confidence: 99%

Sub-cycle Manipulation of Electrons in a Tunnel Junction with Phase-controlled Single-cycle THz Near-fields

et al. 2019

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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.

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“…Terahertz scanning tunneling microscope (STM) (THz-STM) is capable of imaging surfaces with atomic spatial resolution and the subpicosecond time resolution (<0.5 ps), much faster than conventional STM system [15,17,19,20,76,77]. The basic principle of THz-STM is quantum tunneling through the gap between the tip and sample resulting from a transient voltage induced by terahertz pulses.…”

Section: Terahertz Scanning Tunneling Microscopementioning

confidence: 99%

Terahertz quantum plasmonics at nanoscales and angstrom scales

2020

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Through the manipulation of metallic structures, light–matter interaction can enter into the realm of quantum mechanics. For example, intense terahertz pulses illuminating a metallic nanotip can promote terahertz field–driven electron tunneling to generate enormous electron emission currents in a subpicosecond time scale. By decreasing the dimension of the metallic structures down to the nanoscale and angstrom scale, one can obtain a strong field enhancement of the incoming terahertz field to achieve atomic field strength of the order of V/nm, driving electrons in the metal into tunneling regime by overcoming the potential barrier. Therefore, designing and optimizing the metal structure for high field enhancement are an essential step for studying the quantum phenomena with terahertz light. In this review, we present several types of metallic structures that can enhance the coupling of incoming terahertz pulses with the metals, leading to a strong modification of the potential barriers by the terahertz electric fields. Extreme nonlinear responses are expected, providing opportunities for the terahertz light for the strong light–matter interaction. Starting from a brief review about the terahertz field enhancement on the metallic structures, a few examples including metallic tips, dipole antenna, and metal nanogaps are introduced for boosting the quantum phenomena. The emerging techniques to control the electron tunneling driven by the terahertz pulse have a direct impact on the ultrafast science and on the realization of next-generation quantum devices.

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Tailoring Single-Cycle Near Field in a Tunnel Junction with Carrier-Envelope Phase-Controlled Terahertz Electric Fields

Cited by 52 publications

References 49 publications

Active control of ultrafast electron dynamics in plasmonic gaps using an applied bias

Active control of ultrafast electron dynamics in plasmonic gaps using an applied bias

Sub-cycle Manipulation of Electrons in a Tunnel Junction with Phase-controlled Single-cycle THz Near-fields

Terahertz quantum plasmonics at nanoscales and angstrom scales

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