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- 저자 : Barja, Sara (검색결과 2 건)
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Charge density wave order in 1D mirror twin boundaries of single-layer MoSe<sub>2</sub>
Barja, Sara,Wickenburg, Sebastian,Liu, Zhen-Fei,Zhang, Yi,Ryu, Hyejin,Ugeda, Miguel ,M.,Hussain, Zahid,Shen, Zhi-Xun,Mo, Sung-Kwan,Wong, Ed,Salmeron, Miquel ,B.,Wang, Feng,Crommie, Michael F. NATURE PUBLISHING GROUP 2016 NATURE PHYSICS Vol.12 No.8
We provide direct evidence for the existence of isolated, one-dimensional charge density waves at mirror twin boundaries (MTBs) of single-layer semiconducting MoSe<SUB>2</SUB>. Such MTBs have been previously observed by transmission electron microscopy and have been predicted to be metallic in MoSe<SUB>2</SUB> and MoS<SUB>2</SUB>. Our low-temperature scanning tunnelling microscopy/spectroscopy measurements revealed a substantial bandgap of 100 meV opening at the Fermi energy in the otherwise metallic one-dimensional structures. We found a periodic modulation in the density of states along the MTB, with a wavelength of approximately three lattice constants. In addition to mapping the energy-dependent density of states, we determined the atomic structure and bonding of the MTB through simultaneous high-resolution non-contact atomic force microscopy. Density functional theory calculations based on the observed structure reproduced both the gap opening and the spatially resolved density of states.
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Abdallah Barjas Qaswal 대한정신약물학회 2020 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.18 No.2
Objective: Lithium is used as first line in treating bipolar patients to stabilize their mood. However, the exact mechanism of lithium is not yet established. One of the proposed mechanisms is that lithium depolarizes the hyperpolarized neuronal membrane of bipolar patients bringing it back to the normal potential. On the other hand, the only way that lithium causes significant therapeutic depolarization is to have a membrane conductance that must be at least an order of magnitude higher than that for sodium but this is not achieved since both; lithium and sodium have the same conductance because the membrane channels are selective for them approximately by the same degree. So, this study aimed to explain how lithium could achieve higher conductance than sodium. Methods: The idea of quantum tunneling through closed channels was used in a way to calculate the tunneling probability and the quantum conductance for lithium ions. Results: It was found that lithium could achieve higher conductance than sodium because it has a smaller mass than sodium making lithium to have higher probability of tunneling and consequently higher conductance through channels and membrane. Conclusion: Lithium tunneling model provides a reasonable explanation for the therapeutic depolarization effect of lithium. This model is experimentally testable to prove the tunneling effect of ions through the closed channels and to show the variations of quantum conductance between ions according to their mass.
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