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Charge-Carrier Dynamics Determine Perovskite Photovoltaics |
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2018.04.28
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The photovoltaic performance of the perovskite solar cell is determined by the charge-carrier dynamics. These fundamental properties and dynamics behaviors have been discussed and presented to provide a comprehensive understanding into the optoelectronic physics of the perovskite material and devices
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Universal Scaling of Intrinsic Resistivity in Two-Dimensional Metallic Borophene |
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2018.03.30
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The resistivity of metals originating from electron-phonon (e-ph) interactions (i.e. their intrinsic resistivity ρe-ph) is an important fundamental quantity in condensed matter physics and materials science. Recently, several borophene phases have been synthesized on Ag surfaces, e.g., β12, χ3 and triangle sheets (Nat. Chem. 2016, 8 (6), 563-568; Science 2015, 350, 1513). All experimentally realized borophenes exhibit intrinsic metallic properties, providing an ideal platform to explore the transport properties of two-dimensional (2D) metals.
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Magnon Valve Effect Between Two Magnetic Insulators |
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2018.03.19
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The key physics of the spin valve involves spin-polarized conduction electrons propagating between two magnetic layers such that the device conductance is controlled by the relative magnetization orientation of two magnetic layers. Here, we report the effect of a magnon valve which is made of two ferromagnetic insulators (YIG) separated by a nonmagnetic spacer layer (Au). When a thermal gradient is applied perpendicular to the layers, the inverse spin Hall voltage output detected by a Pt bar placed on top of the magnon valve depends on the relative orientation of the magnetization of two YIG layers, indicating the magnon current induced by...
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Unified phase diagram for iron-based superconductors |
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2017.11.22
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It is widely accepted that high-temperature superconductivity in cuprates is achieved by introducing carriers into the parent compound, an antiferromagnetic Mott insulator, which results in a unified phase diagram. As to iron-based superconductors, although the so-called “parent compounds” also show long-range antiferromagnetic orders, they are bad metals and superconductivity can be obtained not just by doping electrons or holes but also by isovalent doping. Moreover, some of the “parent compounds” show superconductivity without the presence of antiferromagnetism. Therefore, it is hard to describe the physical properties of different ...
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