Local tunneling decay length and Kelvin probe force spectroscopy

Albrecht, Florian; Fleischmann, M.; Scheer, Manfred; Groß, Leo; Repp, Jascha

doi:10.1103/physrevb.92.235443

Cited by 11 publications

(8 citation statements)

References 51 publications

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“…Note that we have dropped the zero field splitting and Zeeman terms of electron spin since they have no effects in this pure-dephasing model. For a weakly coupled nuclear spin, consider the Carr-Purcell-Meiboom-Gill (CPMG) control with π-flips at time t p = (2p − 1)τ (where 2τ is the interval between pulses and p=1,2,...N), using the Magnus expansion [24,25], we obtain the nuclear spin propagator conditioned on the NV electron spin state as…”

mentioning

confidence: 99%

Single-Shot Readout of a Nuclear Spin Weakly Coupled to a Nitrogen-Vacancy Center at Room Temperature

Liu

Xing

et al. 2017

Phys. Rev. Lett.

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Single-shot readout of qubits is required for scalable quantum computing. Nuclear spins are superb quantum memories due to their long coherence time, but are difficult to be read out in a single shot due to their weak interaction with probes. Here we demonstrate single-shot readout of a weakly coupled ^{13}C nuclear spin at room temperature, which is unresolvable in traditional protocols. States of the weakly coupled nuclear spin are trapped and read out projectively by sequential weak measurements, which are implemented by dynamical decoupling pulses. A nuclear spin coupled to the nitrogen-vacancy (NV) center with strength 330 kHz is read out in 200 ms with a fidelity of 95.5%. This work provides a general protocol for single-shot readout of weakly coupled qubits at room temperature and therefore largely extends the range of physical systems for scalable quantum computing.

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confidence: 99%

Single-Shot Readout of a Nuclear Spin Weakly Coupled to a Nitrogen-Vacancy Center at Room Temperature

Liu

Xing

et al. 2017

Phys. Rev. Lett.

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“…The LWF value for the ultrathin CuO film is about 4.0 eV. However, the STM tip condition can dramatically influence the absolute LWF value in which possible topographical artifacts [34] and the bias variations [35] could cause measurement errors. Therefore, the difference in LWFs under the same bias and tip conditions is more reliable.…”

Section: Angewandte Chemiementioning

confidence: 99%

Reversibly Switching the Charge State and Adsorption Location of A Single Potassium Atom on Ultrathin CuO Films

Peng

et al. 2020

Angewandte Chemie

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Potassium (K) cations are spontaneously formed upon thermal deposition of low‐coverage K onto an ultrathin CuO monolayer grown on Cu(110) and they were explored by low‐temperature scanning tunneling microscopy (STM) and X‐ray photoemission spectroscopy. The formed K cations are highly immobile and thermally stable. The local work function around an individual K cation decreases by 1.5±0.3 eV, and a charging zone underneath it is established within about 1.0 nm. The cationic and neutral states of the K atom are switchable upon application of an STM bias voltage pulse, which is simultaneously accompanied by an adsorption site relocation.

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“…With the development of qPlus sensors, KPFM could be combined with scanning tunneling microscopy (STM). This combination led to the seminal mapping of charge distributions at the atomic scale and a number of important insights into intramolecular charge distributions. ,,,− However, a quantitative determination of the charge distribution within molecules and molecular layers remains challenging, and it is important to consider that the LCPD value is detected at a certain tip height …”

Section: Introductionmentioning

confidence: 99%

Resolution of Intramolecular Dipoles and a Push-Back Effect of Individual Molecules on a Metal Surface

et al. 2022

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Molecules consisting of a donor and an acceptor moiety can exhibit large intrinsic dipole moments. Upon deposition on a metal surface, the dipole may be effectively screened and the charge distribution altered due to hybridization with substrate electronic states. Here, we deposit ethyldiaminodicyanoquinone molecules, which exhibit a large dipole moment in the gas phase, on a Au(111) surface. Employing a combination of scanning tunneling microscopy and noncontact atomic force microscopy, we find that a significant dipole moment persists in the flat-lying molecules. Density functional theory calculations reveal that the dipole moment is even increased on the metal substrate as compared to the gas phase. We also show that the local contact potential across the molecular islands is decreased by several tens of meV with respect to the bare metal. We explain this by the induced charge-density redistribution due to the adsorbed molecules, which confine the substrate's wavefunction at the interface. Our local measurements provide direct evidence of this so-called push-back or cushion effect at the scale of individual molecules.

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Local tunneling decay length and Kelvin probe force spectroscopy

Cited by 11 publications

References 51 publications

Single-Shot Readout of a Nuclear Spin Weakly Coupled to a Nitrogen-Vacancy Center at Room Temperature

Single-Shot Readout of a Nuclear Spin Weakly Coupled to a Nitrogen-Vacancy Center at Room Temperature

Reversibly Switching the Charge State and Adsorption Location of A Single Potassium Atom on Ultrathin CuO Films

Resolution of Intramolecular Dipoles and a Push-Back Effect of Individual Molecules on a Metal Surface

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