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Controlled switching of a single CuPc molecule on Cu(111) at low temperature

Fremy-Koch, Sweetlana and Sadeghi, Ali and Pawlak, Rémy and Kawai, Shigeki and Baratoff, Alexis and Goedecker, Stefan and Meyer, Ernst and Glatzel, Thilo. (2019) Controlled switching of a single CuPc molecule on Cu(111) at low temperature. Physical Review B, 100 (15). p. 155427.

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Abstract

Low temperature measurements of the tunneling current as a function of the applied bias voltage have been performed on a dense constant-height grid above individual copper phthalocyanine molecules adsorbed on a Cu(111) surface. By appropriate tuning of the applied bias, the molecule can be reversibly switched between two configurations in which pairs of opposite maxima appear rotated by 90 ∘ in the tunneling current map. The underlying conformations are revealed by density functional calculations including van der Waals interactions: a C 2 v symmetric ground state and two energetically equivalent states, in which the molecule is twisted and rotated around its center by ± 7 ∘ . For tip biases above 200 mV position-dependent current switching is observed, as in previous measurements of telegraph noise [Schaffert et al. , Nat. Mater. 12 , 223 (2013) ]. In a small voltage interval around zero the measured current becomes bistable. Switching to a particular state can be initiated by sweeping the voltage past well-defined positive and negative thresholds at certain positions above the molecule or by scanning at constant current and a reduced reverse bias.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer)
05 Faculty of Science > Departement Physik > Physik > Physik (Goedecker)
UniBasel Contributors:Glatzel, Thilo and Sadeghi, Ali and Pawlak, Rémy and Kawai, Shigeki and Baratoff, Alexis and Goedecker, Stefan and Meyer, Ernst
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:2469-9950
e-ISSN:2469-9969
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
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Last Modified:16 Apr 2020 10:13
Deposited On:16 Apr 2020 10:13

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