Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 2: Scanning probe techniques: Method development I
O 2.10: Vortrag
Montag, 12. März 2018, 12:45–13:00, MA 004
Probing the quantum nature of protons in water with STM/S — •Jing Guo1, Jinbo Peng1, Xinzheng Li2,3, En-Ge Wang1,3, and Ying Jiang1,3 — 1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, P. R. China — 2School of Physics, Peking University, Beijing 100871, P. R. China — 3Collaborative Innovation Center of Quantum Matter, Beijing 100871, P. R. China
Quantum behaviors of protons in terms of tunneling and zero-point motion have significant effects on the macroscopic properties, structure, and dynamics of water even at room temperature or higher. In spite of tremendous theoretical and experimental efforts, accurate and quantitative description of the nuclear quantum effects (NQEs) is still challenging. The main difficulty lies in that the NQEs are extremely susceptible to the structural inhomogeneity and local environments, especially when interfacial systems are concerned. In this talk, I will highlight the recent advances of scanning tunneling microscopy and spectroscopy (STM/S), which allows the access to the quantum degree of freedom of protons both in real and energy space. Then I will discuss how the STM/S are used to directly visualize the concerted quantum tunneling of protons within the water clusters and quantify the impact of zero-point motion on the strength of a single hydrogen bond (H bond) at a water/solid interface. Those results may open up the new possibility of exploring the exotic quantum states of light nuclei at surfaces, as well as the quantum coupling between the electrons and nuclei.