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Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Boron-doped graphene nanoribbons: Electronic structure and Raman fingerprint Boris V. Senkovskiy , Dmitry Yu. Usachov , Alexander V. Fedorov , Tomas Marangoni , Danny Haberer , Cesare Tresca , Gianni Profeta , Vasile Caciuc , Shigeru Tsukamoto , Nicolae Atodiresei , Niels Ehlen , Chaoyu Chen , José Avila , Maria C. Asensio , Andrei Yu. Varykhalov , Alexei Nefedov , Christof Wöll , Timur K. Kim , Moritz Hoesch , Felix R. Fischer , Alexander Gruneis Acs Nano DOI: 10.1021/acsnano.8b04125 Diamond Proposal Number(s): [17064] Show Abstract ▼ Abstract: We investigate the electronic and vibrational properties of bottom-up synthesized aligned armchair graphene nanoribbons of N=7 carbon atoms width periodically doped by substitutional boron atoms (B-7AGNRs). Using angle-resolved photoemission spectroscopy (ARPES), we find that the dopant-derived valence and conduction band states are notably hybridized with electronic states of Au substrate and spread in energy. The interaction with the substrate leaves the bands with pure carbon character rather unperturbed. This results in an identical effective mass of ~0.2 m0 for the next highest valence band compared to pristine 7AGNRs. We probe the phonons of B-7AGNRs by ultra-high vacuum (UHV) Raman spectroscopy and reveal the existence of characteristic splittings and red-shifts of Raman modes due to the presence of substitutional boron atoms. Comparing the Raman spectra for three visible lasers (red, green and blue) we find that interaction with gold suppresses the Raman signal from B-7AGNRs and the energy of a green laser (2.33 eV) is closer to the resonant E22 transition. The hybridized electronic structure of the B-7AGNR/Au interface is expected to improve electrical characteristics of contacts between graphene nanoribbon and Au. The Raman fingerprint allows easy identification of B-7AGNRs, that is particularly useful for device fabrication.	Jul 2018
I05-ARPES	Coupling to zone-center optical phonons in VSe2 enhanced by charge density waves Y. Falke , N. Ehlen , G. Marini , A. V. Fedorov , V. Y. Voroshnin , B. V. Senkovskiy , K. Nikonov , M. Hoesch , T. K. Kim , L. Petaccia , G. Di Santo , T. Szkopek , G. Profeta , A. Gruneis Physical Review B 104 DOI: 10.1103/PhysRevB.104.235137 Diamond Proposal Number(s): [17064] Show Abstract ▼ Abstract: We investigate electron-phonon coupling (EPC) in the charge density wave (CDW) phase of V Se 2 by Raman spectroscopy, angle-resolved photoemission spectroscopy (ARPES), and ab initio calculations. Zone folding induced by the 4 × 4 in-plane CDW phase promotes the appearance of a Raman peak at ∼ 170 cm − 1 . The suppression of ARPES intensity in parts of the Fermi surface is also a result of CDW-induced zone folding and anticrossing of the electron energy bands. The appearance of the new Raman peak is in line with the ARPES observation of a kink feature in the spectral function at the same energy. A self-energy analysis yields an EPC constant of λ = 0.3 . Our calculations of the EPC are in excellent agreement and reveal that the kink is caused by several optical phonon branches close in energy. Our paper highlights the CDW phase as a means of inducing EPC pathways to optical phonons that directly affect its Raman spectrum.	Dec 2021

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