The Experts below are selected from a list of 31026 Experts worldwide ranked by ideXlab platform
Angelika Kuhnle - One of the best experts on this subject based on the ideXlab platform.
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long range order induced by intrinsic repulsion on an insulating substrate
Journal of Physical Chemistry C, 2015Co-Authors: Julia L Neff, Ralf Bechstein, Hagen Songen, Philipp Maass, Angelika KuhnleAbstract:An ordered arrangement of molecular stripes with equidistant appearance is formed upon the adsorption of 3-hydroxybenzoic acid onto calcite (10.4) held at room temperature. In a detailed analysis of the next-neighbor stripe distances measured in noncontact atomic force microscopy images at various molecular coverages, we compare the observed stripe arrangement with a random arrangement of noninteracting stripes. The experimentally obtained distance distribution deviates substantially from what is expected for a random distribution of noninteracting stripes, providing direct evidence for the existence of a Repulsive Interaction between the stripes. At low molecular coverage, where the average stripe distance is as large as 16 nm, the stripes are significantly ordered, demonstrating the long-range nature of the involved Repulsive Interaction. The experimental results can be modeled with a potential having a 1/d2 distance dependence, indicating that the observed long-range repulsion mechanism originates from...
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Repulsive Interaction and contrast inversion in noncontact atomic force microscopy imaging of adsorbates
Physical Review B, 2008Co-Authors: Philipp Rahe, Ralf Bechstein, Jens Schutte, Frank Ostendorf, Angelika KuhnleAbstract:To understand contrast formation in atomic resolution noncontact atomic force microscopy (NC-AFM), we investigate whether or not Repulsive tip-sample Interaction contributes to contrast formation. We relate attractive and Repulsive Interactions to contrast features depending on both oscillating amplitude and measured detuning. Simulations based on a Morse potential illustrate the mechanism behind contrast inversion due to Repulsive Interactions above an adsorbate on the surface. Experimental NC-AFM images of adsorbates on mica and TiO(2) surfaces confirm our simulations. Furthermore, we discuss the influence of the topography feedback loop on contrast formation above adsorbates, which illustrates that data interpretation can become rather delicate for constant-detuning images.
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Repulsive Interaction and contrast inversion in noncontact atomic force microscopy imaging of adsorbates
Physical Review B, 2008Co-Authors: Philipp Rahe, Ralf Bechstein, Jens Schutte, Frank Ostendorf, Angelika KuhnleAbstract:To understand contrast formation in atomic resolution noncontact atomic force microscopy (NC-AFM), we investigate whether or not Repulsive tip-sample Interaction contributes to contrast formation. We relate attractive and Repulsive Interactions to contrast features depending on both oscillating amplitude and measured detuning. Simulations based on a Morse potential illustrate the mechanism behind contrast inversion due to Repulsive Interactions above an adsorbate on the surface. Experimental NC-AFM images of adsorbates on mica and ${\text{TiO}}_{2}$ surfaces confirm our simulations. Furthermore, we discuss the influence of the topography feedback loop on contrast formation above adsorbates, which illustrates that data interpretation can become rather delicate for constant-detuning images.
Ken West - One of the best experts on this subject based on the ideXlab platform.
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trapping excitons in a two dimensional in plane harmonic potential experimental evidence for equilibration of indirect excitons
Physical Review Letters, 2006Co-Authors: Zsuzsanna Voros, David W. Snoke, L. N. Pfeiffer, Ken WestAbstract:: We have trapped a gas of long-lifetime, high-mobility excitons in an in-plane harmonic potential. Trapping is an important step toward the goal of a controlled Bose-Einstein condensate of excitons. We show that the Repulsive Interaction between the excitons plays a dominant role in the behavior of the excitons, in contrast with the weak Interactions in atomic gases. We show that under proper conditions the excitons thermalize in the trap to a well-defined equilibrium spatial distribution.
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trapping excitons in a two dimensional in plane harmonic potential experimental evidence for equilibration of indirect excitons
Physical Review Letters, 2006Co-Authors: Zsuzsanna Voros, David W. Snoke, L. N. Pfeiffer, Ken WestAbstract:: We have trapped a gas of long-lifetime, high-mobility excitons in an in-plane harmonic potential. Trapping is an important step toward the goal of a controlled Bose-Einstein condensate of excitons. We show that the Repulsive Interaction between the excitons plays a dominant role in the behavior of the excitons, in contrast with the weak Interactions in atomic gases. We show that under proper conditions the excitons thermalize in the trap to a well-defined equilibrium spatial distribution.
Ralf Bechstein - One of the best experts on this subject based on the ideXlab platform.
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long range order induced by intrinsic repulsion on an insulating substrate
Journal of Physical Chemistry C, 2015Co-Authors: Julia L Neff, Ralf Bechstein, Hagen Songen, Philipp Maass, Angelika KuhnleAbstract:An ordered arrangement of molecular stripes with equidistant appearance is formed upon the adsorption of 3-hydroxybenzoic acid onto calcite (10.4) held at room temperature. In a detailed analysis of the next-neighbor stripe distances measured in noncontact atomic force microscopy images at various molecular coverages, we compare the observed stripe arrangement with a random arrangement of noninteracting stripes. The experimentally obtained distance distribution deviates substantially from what is expected for a random distribution of noninteracting stripes, providing direct evidence for the existence of a Repulsive Interaction between the stripes. At low molecular coverage, where the average stripe distance is as large as 16 nm, the stripes are significantly ordered, demonstrating the long-range nature of the involved Repulsive Interaction. The experimental results can be modeled with a potential having a 1/d2 distance dependence, indicating that the observed long-range repulsion mechanism originates from...
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Long-Range Order Induced by Intrinsic Repulsion on an Insulating Substrate
2015Co-Authors: Julia L. Neff, Ralf Bechstein, Philipp Maass, Hagen Söngen, Angelika KühnleAbstract:An ordered arrangement of molecular stripes with equidistant appearance is formed upon the adsorption of 3-hydroxybenzoic acid onto calcite (10.4) held at room temperature. In a detailed analysis of the next-neighbor stripe distances measured in noncontact atomic force microscopy images at various molecular coverages, we compare the observed stripe arrangement with a random arrangement of noninteracting stripes. The experimentally obtained distance distribution deviates substantially from what is expected for a random distribution of noninteracting stripes, providing direct evidence for the existence of a Repulsive Interaction between the stripes. At low molecular coverage, where the average stripe distance is as large as 16 nm, the stripes are significantly ordered, demonstrating the long-range nature of the involved Repulsive Interaction. The experimental results can be modeled with a potential having a 1/d2 distance dependence, indicating that the observed long-range repulsion mechanism originates from electrostatic repulsion of adsorption-induced dipoles solely. This effect is particularly pronounced when local charges remain unscreened on the surface, which is characteristic of nonmetallic substrates. Consequently, the observed generic repulsion mechanism is expected to play a dominant role in molecular self-assembly on electrically insulating substrates
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Repulsive Interaction and contrast inversion in noncontact atomic force microscopy imaging of adsorbates
Physical Review B, 2008Co-Authors: Philipp Rahe, Ralf Bechstein, Jens Schutte, Frank Ostendorf, Angelika KuhnleAbstract:To understand contrast formation in atomic resolution noncontact atomic force microscopy (NC-AFM), we investigate whether or not Repulsive tip-sample Interaction contributes to contrast formation. We relate attractive and Repulsive Interactions to contrast features depending on both oscillating amplitude and measured detuning. Simulations based on a Morse potential illustrate the mechanism behind contrast inversion due to Repulsive Interactions above an adsorbate on the surface. Experimental NC-AFM images of adsorbates on mica and TiO(2) surfaces confirm our simulations. Furthermore, we discuss the influence of the topography feedback loop on contrast formation above adsorbates, which illustrates that data interpretation can become rather delicate for constant-detuning images.
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Repulsive Interaction and contrast inversion in noncontact atomic force microscopy imaging of adsorbates
Physical Review B, 2008Co-Authors: Philipp Rahe, Ralf Bechstein, Jens Schutte, Frank Ostendorf, Angelika KuhnleAbstract:To understand contrast formation in atomic resolution noncontact atomic force microscopy (NC-AFM), we investigate whether or not Repulsive tip-sample Interaction contributes to contrast formation. We relate attractive and Repulsive Interactions to contrast features depending on both oscillating amplitude and measured detuning. Simulations based on a Morse potential illustrate the mechanism behind contrast inversion due to Repulsive Interactions above an adsorbate on the surface. Experimental NC-AFM images of adsorbates on mica and ${\text{TiO}}_{2}$ surfaces confirm our simulations. Furthermore, we discuss the influence of the topography feedback loop on contrast formation above adsorbates, which illustrates that data interpretation can become rather delicate for constant-detuning images.
Philipp Rahe - One of the best experts on this subject based on the ideXlab platform.
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Repulsive Interaction and contrast inversion in noncontact atomic force microscopy imaging of adsorbates
Physical Review B, 2008Co-Authors: Philipp Rahe, Ralf Bechstein, Jens Schutte, Frank Ostendorf, Angelika KuhnleAbstract:To understand contrast formation in atomic resolution noncontact atomic force microscopy (NC-AFM), we investigate whether or not Repulsive tip-sample Interaction contributes to contrast formation. We relate attractive and Repulsive Interactions to contrast features depending on both oscillating amplitude and measured detuning. Simulations based on a Morse potential illustrate the mechanism behind contrast inversion due to Repulsive Interactions above an adsorbate on the surface. Experimental NC-AFM images of adsorbates on mica and TiO(2) surfaces confirm our simulations. Furthermore, we discuss the influence of the topography feedback loop on contrast formation above adsorbates, which illustrates that data interpretation can become rather delicate for constant-detuning images.
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Repulsive Interaction and contrast inversion in noncontact atomic force microscopy imaging of adsorbates
Physical Review B, 2008Co-Authors: Philipp Rahe, Ralf Bechstein, Jens Schutte, Frank Ostendorf, Angelika KuhnleAbstract:To understand contrast formation in atomic resolution noncontact atomic force microscopy (NC-AFM), we investigate whether or not Repulsive tip-sample Interaction contributes to contrast formation. We relate attractive and Repulsive Interactions to contrast features depending on both oscillating amplitude and measured detuning. Simulations based on a Morse potential illustrate the mechanism behind contrast inversion due to Repulsive Interactions above an adsorbate on the surface. Experimental NC-AFM images of adsorbates on mica and ${\text{TiO}}_{2}$ surfaces confirm our simulations. Furthermore, we discuss the influence of the topography feedback loop on contrast formation above adsorbates, which illustrates that data interpretation can become rather delicate for constant-detuning images.
Reinhard Guckenberger - One of the best experts on this subject based on the ideXlab platform.
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spectroscopy of the anharmonic cantilever oscillations in tapping mode atomic force microscopy
Applied Physics Letters, 2000Co-Authors: Martin Stark, Robert W Stark, Wolfgang M Heckl, Reinhard GuckenbergerAbstract:By spectroscopic analysis of the cantilever oscillation in tapping-mode atomic-force microscopy (TM–AFM), we demonstrate that the transition from an oscillatory state dominated by a net attractive force to the state dominated by Repulsive Interaction is accompanied by the enhanced generation of higher harmonics. The higher harmonics are a consequence of the nonlinear Interaction and are amplified to significant amplitudes by the eigenmodes of the cantilever. The results show that in a quantitative description of TM–AFM higher eigenmode excitation must be considered to account for internal energy dissipation.
