Yasuo Minami

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Dirac-like electrons in solid state have been of great interest since they exhibit many peculiar physical behaviors analogous to relativistic mechanics. Among them, carriers in graphene and surface states of topological insulators are known to behave as massless Dirac fermions with a conical band structure in the two-dimensional momentum space, whereas(More)
Recent advances of ultrafast spectroscopy allow the capture of an entire ultrafast signal waveform in a single probe shot, which greatly reduces the measurement time and opens the door for the spectroscopy of unrepeatable phenomena. However, most single-shot detection schemes rely on two-dimensional detectors, which limit the repetition rate of the(More)
We observed terahertz transmittances to study carrier dynamics in bismuth (Bi) thin film with optical pump-terahertz probe spectroscopy and terahertz pump-terahertz probe spectroscopy. Under the intense terahertz wave illumination, the transmittance of Bi thin film increases, indicating that the effective mass of the carriers becomes heavier due to the(More)
Improved control over the electromagnetic properties of metal nanostructures is indispensable for the development of next-generation integrated nanocircuits and plasmonic devices. The use of terahertz (THz)-field-induced nonlinearity is a promising approach to controlling local electromagnetic properties. Here, we demonstrate how intense THz electric fields(More)
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