Multi-Probe Scanning Tunneling Microscopy

Hasegawa, Shuji

doi:10.1007/978-0-387-28668-6_18

Cited by 5 publications

(4 citation statements)

References 56 publications

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“…Using a small voltage window (±1 V) and a fast sweep rate (∼200 V s –1 ) allows for single-nucleotide measurement times of ∼0.5 s (30 sweeps per measurement), with an estimated sequencing speed of ∼8 min kb –1 when using a single tip. However this speed could be dramatically improved by using an array of tips scanning a much larger area in parallel 38. We also expect this approach to be more broadly applicable to other biologically relevant chemical alterations of nucleotides, including epigenetic modifications and oxidative damage.…”

Section: Resultsmentioning

confidence: 99%

Nucleotide and structural label identification in single RNA molecules with quantum tunneling spectroscopy

et al. 2019

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Section: Resultsmentioning

confidence: 99%

Nucleotide and structural label identification in single RNA molecules with quantum tunneling spectroscopy

et al. 2019

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“…STM on the well defined surfaces of TKIs would provide valuable local information, not only a mere atomic structure but also single-atom electron spectra or orbital configuration [45,46]. Electric conduction measurements are also applicable for in situ prepared well-defined surface samples [70]. Such a method applied to the TKI surfaces would provide further information on the electronic structures of TKIs.…”

Section: Summary and Future Perspectivementioning

confidence: 99%

Recent progress in clean-surface formation of topological Kondo insulators and topological surface states observed there

Ohtsubo¹,

Kimura²,

Fumitoshi³

2022

Electron. Struct.

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The peculiar metallic electronic states proposed and observed in Kondo insulators, whose bandgap opens at low temperature derived from the Kondo effect between itinerant and localized electrons, have attracted considerable attention in this decade, because it suggests the coexistence of strong electron correlation and non-trivial topological order in such Kondo insulators, namely topological Kondo insulators (TKIs). However, experimental studies of these states have led to controversial conclusions mainly owing to the difficulty and inhomogeneity of the single crystal surfaces of the TKI candidates, samarium hexaboride (SmB6) and ytterbium dodecaboride (YbB12). In this article, we review studies focused on the surface atomic and electronic structures of TKI candidates and recent progress to form homogeneous, well-defined clean surfaces of them. Due to the homogeneous surface formation, the surface electronic states and their non-trivial topological order are elucidated well in SmB6 and YbB12, by using spin- and angle-resolved photoelectron spectroscopy.

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“…Scanning tunneling microscopy using two tips simultaneously in tunneling, also called double-tip STM, often relies on two individually driven metal wire probes brought into close proximity to locally probe resistivity [1][2][3] or to access the proposed electron correlations at the nanoscale [4][5][6][7][8][9][10][11]. Achieving tip separation down to the nanometer scale, a long standing goal in multiprobe STM, has proven challenging and is limited by the radius of curvature of the two tips [12] and requires sophisticated navigation routines [13,14]. Recently multiprobe systems able to achieve a tip separation down to 30 nm have emerged [1,13] and have resulted in the first double-tip correlation measurements to date [15].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of on-chip probes for double-tip scanning tunneling microscopy

et al. 2020

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A reduction of the interprobe distance in multiprobe and double-tip scanning tunneling microscopy to the nanometer scale has been a longstanding and technically difficult challenge. Recent multiprobe systems have allowed for significant progress by achieving distances of ~30 nm using two individually driven, traditional metal wire tips. For situations where simple alignment and fixed separation can be advantageous, we present the fabrication of on-chip double-tip devices that incorporate two mechanically fixed gold tips with a tip separation of only 35 nm. We utilize the excellent mechanical, insulating and dielectric properties of high-quality SiN as a base material to realize easy-to-implement, lithographically defined and mechanically stable tips. With their large contact pads and adjustable footprint, these novel tips can be easily integrated with most existing commercial combined STM/AFM systems.

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Multi-Probe Scanning Tunneling Microscopy

Cited by 5 publications

References 56 publications

Nucleotide and structural label identification in single RNA molecules with quantum tunneling spectroscopy

Nucleotide and structural label identification in single RNA molecules with quantum tunneling spectroscopy

Recent progress in clean-surface formation of topological Kondo insulators and topological surface states observed there

Fabrication of on-chip probes for double-tip scanning tunneling microscopy

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