We experimentally demonstrated focusing of light with orbital angular momentum (OAM) using an 8-element circular array of linear antennas A spiral phase plate was used to generate a vortex beam with an OAM of (h) over bar in the terahertz (THz) fr...
An insulating bulk state is a prerequisite for the protection of topological edge states(1). In quantum Hall systems, the thermal excitation of delocalized electrons is the main route to breaking bulk insulation(2). In equilibrium, the only way to...
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工学研究科