Charge trapping and super-Poissonian noise centres in a cuprate superconductor

Bastiaans, Koen M.; Cho, D.; Benschop, Tjerk; Battisti, Irene; Huang, Yuan; Golden, M. S.; Dong, Qing; Jin, Yong; Zaanen, Jan; Allan, Milan P.

doi:10.1038/s41567-018-0300-z

Cited by 21 publications

(9 citation statements)

References 47 publications

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“…In the opposite limit, Γ t Γ r , transport takes place via Andreev reflections, and the sub-gap conductance peaks at eV = ±(∆ t +E ig ) would be of equal magnitude, even though the underlying spectral function is generally asymmetric [37]. We note that in principle, shot noise experiments [33,61,62] or photo-assisted tunneling [63] experiments could differentiate between the two cases. The experimental data shown in Fig.…”

Section: F Gate-tunable Single Impurity Anderson Modelmentioning

confidence: 93%

Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor $\mathrm{FeTe}_{0.55}\mathrm{Se}_{0.45}$

Chatzopoulos,

Cho,

Bastiaans

et al. 2020

Preprint

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By using scanning tunneling microscopy (STM) we find and characterize dispersive, energysymmetric in-gap states in the iron-based superconductor FeTe0.55Se0.45, a material that exhibits signatures of topological superconductivity, and Majorana bound states at vortex cores or at impurity locations. We use a superconducting STM tip for enhanced energy resolution, which enables us to show that impurity states can be tuned through the Fermi level with varying tip-sample distance. We find that the impurity state is of the Yu-Shiba-Rusinov (YSR) type, and argue that the energy shift is caused by the low superfluid density in FeTe0.55Se0.45, which allows the electric field of the tip to slightly penetrate the sample. We model the newly introduced tip-gating scenario within the single-impurity Anderson model and find good agreement to the experimental data.

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Section: F Gate-tunable Single Impurity Anderson Modelmentioning

confidence: 93%

Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor $\mathrm{FeTe}_{0.55}\mathrm{Se}_{0.45}$

Chatzopoulos,

Cho,

Bastiaans

et al. 2020

Preprint

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“…Investigations of shot noise with STM are still fairly few in number [25][26][27][28][29][30][31][32]. Here we present results from single Fe atoms on Au(111) surfaces that are hydrogenated in a low-temperature scanning tunneling microscope (STM).…”

Section: Introductionmentioning

confidence: 94%

Current shot noise in atomic contacts: Fe and FeH$_2$ between Au electrodes

Mohr,

Weismann,

et al. 2021

Preprint

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Single Fe atoms on Au(111) surfaces were hydrogenated and dehydrogenated with the Au tip of a low-temperature scanning tunneling microscope (STM). Fe and FeH2 were contacted with the tip of the microscope and show distinctly different evolutions of the conductance with the tip-substrate distance. The current shot noise of these contacts has been measured and indicates a single relevant conductance channel with the spin-polarized transmission. For FeH2 the spin polarization reaches values up to 80% for low conductances and is reduced if the tip-surface distance is decreased. These observations are partially reproduced using density functional theory (DFT) based transport calculations. We suggest that the quantum motion of the hydrogen atoms, which is not taken into account in our DFT modeling, may have a significant effect on the results.

show abstract

“…Investigations of shot noise with a scanning tunneling microscope (STM) are still fairly few in number [25][26][27][28][29][30][31][32]. Here we present results from single Fe atoms on Au(111) surfaces that are hydrogenated in a low-temperature STM.…”

Section: Introductionmentioning

confidence: 95%

Current shot noise in atomic contacts: Fe and FeH2 between Au electrodes

Mohr

Brandbyge

et al. 2021

Phys. Rev. B

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Single Fe atoms on Au(111) surfaces were hydrogenated and dehydrogenated with the Au tip of a lowtemperature scanning tunneling microscope (STM). Fe and FeH 2 were contacted with the tip of the microscope and show distinctly different evolutions of the conductance with the tip-substrate distance. The current shot noise of these contacts has been measured and indicates a single relevant conductance channel with the spin-polarized transmission. For FeH 2 , the spin polarization reaches values up to 80% for low conductances and is reduced if the tip-surface distance is decreased. These observations are partially reproduced using density functional theory (DFT)-based transport calculations. We suggest that the quantum motion of the hydrogen atoms, which is not taken into account in our DFT modeling, may have a significant effect on the results.

show abstract

Charge trapping and super-Poissonian noise centres in a cuprate superconductor

Cited by 21 publications

References 47 publications

Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor $\mathrm{FeTe}_{0.55}\mathrm{Se}_{0.45}$

Spatially dispersing Yu-Shiba-Rusinov states in the unconventional superconductor $\mathrm{FeTe}_{0.55}\mathrm{Se}_{0.45}$

Current shot noise in atomic contacts: Fe and FeH$_2$ between Au electrodes

Current shot noise in atomic contacts: Fe and FeH2 between Au electrodes

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