%0 Journal Article %1 D3CP02911E %A Christ, Andreas %A Härtl, Patrick %A Seitz, Manuel %A Edelmann, Tobias %A Bode, Matthias %A Waluk, Jacek %A Leisegang, Markus %D 2023 %I The Royal Society of Chemistry %J Phys. Chem. Chem. Phys. %K a %N 35 %P 23894-23900 %R 10.1039/D3CP02911E %T Anisotropic coupling of individual vibrational modes to a Cu(110) substrate %U http://dx.doi.org/10.1039/D3CP02911E %V 25 %X We present a study on the excitation of individual vibrational modes with ballistic charge carriers propagating along the Cu(110) surface. By means of the molecular nanoprobe technique, where the reversible switching of a molecule—in this case tautomerization of porphycene—is utilized to detect excitation events, we reveal anisotropic coupling of two distinct vibrational modes to the substrate. The N–H bending mode, excited below |E| ≈ 376 meV, exhibits maxima perpendicular to the rows of the Cu(110) substrate and minima along the rows. In contrast, the N–H stretching mode, excited above |E| ≈ 376 meV, displays maxima along the rows and is constant otherwise. This inversion of the anisotropy reflects the orthogonality between the N–H bending and stretching mode. Additionally, we observe an energy-dependent asymmetry in the propagation direction of charge carriers injected into the Cu(110) surface state. Hereby, the anisotropic band structure results in a correlation between the group velocity and the tunneling probability into electronic states of the substrate.

@article{D3CP02911E, abstract = {We present a study on the excitation of individual vibrational modes with ballistic charge carriers propagating along the Cu(110) surface. By means of the molecular nanoprobe technique{,} where the reversible switching of a molecule—in this case tautomerization of porphycene—is utilized to detect excitation events{,} we reveal anisotropic coupling of two distinct vibrational modes to the substrate. The N–H bending mode{,} excited below |E| ≈ 376 meV{,} exhibits maxima perpendicular to the rows of the Cu(110) substrate and minima along the rows. In contrast{,} the N–H stretching mode{,} excited above |E| ≈ 376 meV{,} displays maxima along the rows and is constant otherwise. This inversion of the anisotropy reflects the orthogonality between the N–H bending and stretching mode. Additionally{,} we observe an energy-dependent asymmetry in the propagation direction of charge carriers injected into the Cu(110) surface state. Hereby{,} the anisotropic band structure results in a correlation between the group velocity and the tunneling probability into electronic states of the substrate.}, added-at = {2023-10-18T10:01:31.000+0200}, author = {Christ, Andreas and Härtl, Patrick and Seitz, Manuel and Edelmann, Tobias and Bode, Matthias and Waluk, Jacek and Leisegang, Markus}, biburl = {https://www.bibsonomy.org/bibtex/288e2cdb9ce1b165abe14a65809630e05/ctqmat}, day = 24, description = {Anisotropic coupling of individual vibrational modes to a Cu(110) substrate - Physical Chemistry Chemical Physics (RSC Publishing)}, doi = {10.1039/D3CP02911E}, interhash = {c71ce1d5c779b758fcb385da6c3b5f3c}, intrahash = {88e2cdb9ce1b165abe14a65809630e05}, journal = {Phys. Chem. Chem. Phys.}, keywords = {a}, month = {08}, number = 35, pages = {23894-23900}, publisher = {The Royal Society of Chemistry}, timestamp = {2023-10-18T10:01:31.000+0200}, title = {Anisotropic coupling of individual vibrational modes to a Cu(110) substrate}, url = {http://dx.doi.org/10.1039/D3CP02911E}, volume = 25, year = 2023 }