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  Variable Repetition Rate THz Source for Ultrafast Scanning Tunneling Microscopy

Abdo, M., Sheng, S., Rolf-Pissarczyk, S., Arnhold, L., Burgess, J. A. J., Isobe, M., et al. (2021). Variable Repetition Rate THz Source for Ultrafast Scanning Tunneling Microscopy. ACS Photonics, 8(3), 702-708. doi:10.1021/acsphotonics.0c01652.

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acsphotonics.0c01652.pdf (Publisher version), 3MB
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2021
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© The Authors. Published by American Chemical Society

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 Creators:
Abdo, M.1, 2, 3, Author              
Sheng, S.1, Author
Rolf-Pissarczyk, S.2, 3, Author              
Arnhold, L.1, Author
Burgess, J. A. J.4, Author
Isobe, M.2, Author
Malavolti, L.2, Author
Loth, S.1, 2, 3, Author              
Affiliations:
1University of Stuttgart, Institute for Functional Matter and Quantum Technologies, ou_persistent22              
2Max Planck Institute for Solid State Research, ou_persistent22              
3Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938290              
4Department of Physics and Astronomy, University of Manitoba, ou_persistent22              

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Free keywords: THz generation, variable repetition rate, scanning tunneling microscopy, near-field tip enhancement, THz-coupled STM, pump−probe spectroscopy
 Abstract: Broadband THz pulses enable ultrafast electronic transport experiments on the nanoscale by coupling THz electric fields into the devices with antennas, asperities, or scanning probe tips. Here, we design a versatile THz source optimized for driving the highly resistive tunnel junction of a scanning tunneling microscope. The source uses optical rectification in lithium niobate to generate arbitrary THz pulse trains with freely adjustable repetition rates between 0.5 and 41 MHz. These induce subpicosecond voltage transients in the tunnel junction with peak amplitudes between 0.1 and 12 V, achieving a conversion efficiency of 0.4 V/(kV/cm) from far-field THz peak electric field strength to peak junction voltage in the STM. Tunnel currents in the quantum limit of less than one electron per THz pulse are readily detected at multi-MHz repetition rates. The ability to tune between high pulse energy and high signal fidelity makes this THz source design effective for exploration of ultrafast and atomic-scale electron dynamics.

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Language(s): eng - English
 Dates: 2020-10-262021-03-082021-03-17
 Publication Status: Published in print
 Pages: 7
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acsphotonics.0c01652
 Degree: -

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Project name : -
Grant ID : 633818
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: ACS Photonics
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: - Volume / Issue: 8 (3) Sequence Number: - Start / End Page: 702 - 708 Identifier: ISSN: 2330-4022
CoNE: https://pure.mpg.de/cone/journals/resource/2330-4022