Tunneling spectroscopy of ultrathin insulating Cu 2N films, and single Co adatoms

T. Choi; C. D. Ruggiero; J. A. Gupta

doi:10.1116/1.3010720

Tunneling spectroscopy of ultrathin insulating Cu ₂N films, and single Co adatoms

T. Choi, C. D. Ruggiero, J. A. Gupta

Department of Physics

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

Abstract

Scanning tunneling microscopy is used to characterize the electronic structure of 1 ML films of c (2×2) NCu (100) (i.e., Cu2 N). By varying nitrogen coverage, a variety of morphologies are prepared, including (1) isolated ∼25 nm2 islands, (2) close-packed arrays of islands, and (3) quasicontinuous monolayer films. In all three regimes, the authors find that Cu2 N acts as an insulator, with a band gap that exceeds 4 eV. The insulating Cu2 N films are used to control the coupling of adsorbed Co atoms to the Cu(100) surface electron density. Tunneling spectroscopy of Co on Cu2 N reveals an unoccupied atomic resonance, Kondo effect, and spin-flip excitation. These features depend on binding site within the Cu2 N film, and are distinctly different than corresponding spectra for Co on Cu(100).

Original language	English
Pages (from-to)	887-890
Number of pages	4
Journal	Journal of Vacuum Science and Technology B: Microelectronics and Nanometer Structures
Volume	27
Issue number	2
DOIs	https://doi.org/10.1116/1.3010720
State	Published - 2009

Bibliographical note

Funding Information:
The authors thank A. J. Heinrich, C. F. Hirjibehedin, and A. F. Otte for helpful discussions concerning their recent results. They are grateful for support from NSF CAREER DMR-0645451.

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10.1116/1.3010720

Cite this

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title = "Tunneling spectroscopy of ultrathin insulating Cu 2N films, and single Co adatoms",

abstract = "Scanning tunneling microscopy is used to characterize the electronic structure of 1 ML films of c (2×2) NCu (100) (i.e., Cu2 N). By varying nitrogen coverage, a variety of morphologies are prepared, including (1) isolated ∼25 nm2 islands, (2) close-packed arrays of islands, and (3) quasicontinuous monolayer films. In all three regimes, the authors find that Cu2 N acts as an insulator, with a band gap that exceeds 4 eV. The insulating Cu2 N films are used to control the coupling of adsorbed Co atoms to the Cu(100) surface electron density. Tunneling spectroscopy of Co on Cu2 N reveals an unoccupied atomic resonance, Kondo effect, and spin-flip excitation. These features depend on binding site within the Cu2 N film, and are distinctly different than corresponding spectra for Co on Cu(100).",

author = "T. Choi and Ruggiero, {C. D.} and Gupta, {J. A.}",

note = "Funding Information: The authors thank A. J. Heinrich, C. F. Hirjibehedin, and A. F. Otte for helpful discussions concerning their recent results. They are grateful for support from NSF CAREER DMR-0645451. ",

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pages = "887--890",

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T1 - Tunneling spectroscopy of ultrathin insulating Cu 2N films, and single Co adatoms

AU - Choi, T.

AU - Ruggiero, C. D.

AU - Gupta, J. A.

N1 - Funding Information: The authors thank A. J. Heinrich, C. F. Hirjibehedin, and A. F. Otte for helpful discussions concerning their recent results. They are grateful for support from NSF CAREER DMR-0645451.

PY - 2009

Y1 - 2009

N2 - Scanning tunneling microscopy is used to characterize the electronic structure of 1 ML films of c (2×2) NCu (100) (i.e., Cu2 N). By varying nitrogen coverage, a variety of morphologies are prepared, including (1) isolated ∼25 nm2 islands, (2) close-packed arrays of islands, and (3) quasicontinuous monolayer films. In all three regimes, the authors find that Cu2 N acts as an insulator, with a band gap that exceeds 4 eV. The insulating Cu2 N films are used to control the coupling of adsorbed Co atoms to the Cu(100) surface electron density. Tunneling spectroscopy of Co on Cu2 N reveals an unoccupied atomic resonance, Kondo effect, and spin-flip excitation. These features depend on binding site within the Cu2 N film, and are distinctly different than corresponding spectra for Co on Cu(100).

AB - Scanning tunneling microscopy is used to characterize the electronic structure of 1 ML films of c (2×2) NCu (100) (i.e., Cu2 N). By varying nitrogen coverage, a variety of morphologies are prepared, including (1) isolated ∼25 nm2 islands, (2) close-packed arrays of islands, and (3) quasicontinuous monolayer films. In all three regimes, the authors find that Cu2 N acts as an insulator, with a band gap that exceeds 4 eV. The insulating Cu2 N films are used to control the coupling of adsorbed Co atoms to the Cu(100) surface electron density. Tunneling spectroscopy of Co on Cu2 N reveals an unoccupied atomic resonance, Kondo effect, and spin-flip excitation. These features depend on binding site within the Cu2 N film, and are distinctly different than corresponding spectra for Co on Cu(100).

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