Coulomb blockade and quantum confinement in field electron emission from heterostructured nanotips

Kleshch, Victor I.; Porshyn, V.; Lützenkirchen‐Hecht, Dirk; Obraztsov, A. N.

doi:10.1103/physrevb.102.235437

Cited by 12 publications

(6 citation statements)

References 35 publications

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“…But, a relatively strong DNCS can be observed over the top nano-semisphere, as shown in Fig. 4(c), which maybe a combined action of the Coulomb blockade and the quantum con nement [35][36][37][38] . Moreover, a comparison about the net-charge distribution over the NOAs with different apex-appearance including the cone-apex and the sphere-apex, is also conducted.…”

Section: Resultsmentioning

confidence: 99%

Near-field lightwave and correlated net-charge distribution over arrayed silicon nano-cone-tip optical antenna covered by common metal film

Liu,

Shi,

Duan

et al. 2023

Preprint

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In this paper, the near-field lightwave characteristics of an arrayed silicon nano-cone-tip optical antenna (NOA) covered by a common metal film, which can be viewed as a featured quantum dot (QD), are carefully investigated. A dipole net-charge distribution closely correlated with the surface lightwaves excited over the antennas by incident lasers with a central wavelength of 633 nm, is clearly observed. An obvious Coulomb blockade from the apex apparently influencing the net-charge converging over the surface of NOA, is verified, which can also be predicted by the simulations according to surface standing waves across the apex node. The antinodes of the surface net-charge instantaneous distribution are already pushed away from the normal location owing to the apex Coulomb blockade, so as to present a distorted waveform different from traditional standing wave modes. The tip proximity effect leading to a relatively weak net-charge converging over surrounding planar facet and adjacent NOAs, is also discovered.

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Section: Resultsmentioning

confidence: 99%

Near-field lightwave and correlated net-charge distribution over arrayed silicon nano-cone-tip optical antenna covered by common metal film

Liu,

Shi,

Duan

et al. 2023

Preprint

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show abstract

“…All these spectra include staircase-like features, which are usually associated with nanoparticles that have isolated electron systems. In literature, they are attributed either to dimensional quantization [14,57,74] or the Coulomb blockade effect [2,30,[75][76][77][78][79]. Thus, it can be inferred that at least some islets directly observed in microscopic images (Figures 7b, 8e and 9a) were insulated from their environment-as it is required by several emission models [2,[42][43][44][49][50][51][52][53][54][55][56][57], including the model proposed in [62].…”

Section: Effect Of Formingmentioning

confidence: 98%

Low-Field Electron Emission Capability of Thin Films on Flat Silicon Substrates: Experiments with Mo and General Model for Refractory Metals and Carbon

et al. 2021

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Herein, we describe a study of the phenomenon of field-induced electron emission from thin films deposited on flat Si substrates. Films of Mo with an effective thickness of 6–10 nm showed room-temperature low-field emissivity; a 100 nA current was extracted at macroscopic field magnitudes as low as 1.4–3.7 V/μm. This result was achieved after formation treatment of the samples by combined action of elevated temperatures (100–600 °C) and the electric field. Morphology of the films was assessed by AFM, SEM, and STM/STS methods before and after the emission tests. The images showed that forming treatment and emission experiments resulted in the appearance of numerous defects at the initially continuous and smooth films; in some regions, the Mo layer was found to consist of separate nanosized islets. Film structure reconstruction (dewetting) was apparently induced by emission-related factors, such as local heating and/or ion irradiation. These results were compared with our previous data obtained in experiments with carbon islet films of similar average thickness deposited onto identical substrates. On this basis, we suggest a novel model of emission mechanism that might be common for thin films of carbon and refractory metals. The model combines elements of the well-known patch field, multiple barriers, and thermoelectric models of low-macroscopic-field electron emission from electrically nanostructured heterogeneous materials.

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“…Single-electron emission through a single quantized energy level is the ultimate model to overcome the abovementioned challenge, which can be realized through resonant tunneling field emission in a Coulomb blockade regime. [7][8][9][10][11][12] In this model, the initial emission is primarily confined within an ultranarrow energy level. [7,8,12] Moreover, the Coulomb interaction between electrons can be avoided as emitted electrons are well-separated in time.…”

Section: Introductionmentioning

confidence: 99%

Ultracoherent Single‐Electron Emission of Carbon Nanotubes

et al. 2023

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A single‐electron emitter, based on a single quantized energy level, can potentially achieve ultimate temporal and spatial coherence with a large emission current, which is desirable for atomic‐resolution electron probes. This is first developed by constructing a nano‐object on a metal tip to form a quantized double barrier structure. However, the single‐electron‐emission current can only achieve a picoampere level due to the low electron tunneling rate of the heterojunction with large barrier width, which limits the practical applications. In this study, carbon nanotubes (CNTs) serve as a single‐electron emitter and a current up to 1.5 nA is demonstrated. The double barrier structure formed on the CNT tip enables a high tunneling rate (≈1012 s−1) due to the smaller barrier width. The emitter also shows high temporal coherence (energy dispersion of ≈10 meV) and spatial coherence (effective source radius of ≈0.85 nm). This work represents a highly coherent electron source to simplify the electron optics system of atomic‐resolution electron microscopy and sub‐10 nm electron beam lithography.

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Coulomb blockade and quantum confinement in field electron emission from heterostructured nanotips

Cited by 12 publications

References 35 publications

Near-field lightwave and correlated net-charge distribution over arrayed silicon nano-cone-tip optical antenna covered by common metal film

Near-field lightwave and correlated net-charge distribution over arrayed silicon nano-cone-tip optical antenna covered by common metal film

Low-Field Electron Emission Capability of Thin Films on Flat Silicon Substrates: Experiments with Mo and General Model for Refractory Metals and Carbon

Ultracoherent Single‐Electron Emission of Carbon Nanotubes

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