11 Result(s)
within
S. Fujimoto
Physics
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Article
Thermodynamic evidence for a field-angle-dependent Majorana gap in a Kitaev spin liquid
The exactly solvable Kitaev model of two-dimensional honeycomb magnets has a quantum spin liquid phase characterized by the emergence of fractionalized Majorana fermion excitations. In the paramagnetic state o...
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Article
Colossal thermomagnetic response in the exotic superconductor URu2Si2
The Nernst coefficient is a measure of the transverse thermoelectric effect in a conductor. Superconducting fluctuations magnify this effect but in URu2Si2, the million-fold enhancement suggests that the fluctuat...
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Chapter
Microscopic Theory of Pairing Mechanisms
This chapter deals with the microscopic theory of pairing mechanisms for noncentrosymmetric superconductors. One of curious questions is how to understand microscopically the parity mixing arising from the int...
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Chapter
Aspects of Spintronics
In this chapter, transport properties raised by antisymmetric spin-orbit interactions in noncentrosymmetric systems are discussed. We consider magnetoelectric effects, the anomalous Hall effect, the spin Hall ...
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Chapter
New Regenerator Material for Sub-4 K Cryocoolers
A new magnetic regenerator material for sub-4 K cryocoolers has been studied. Some rare-earth oxide magnetic materials have the potential to provide a high heat capacity below 4 K. From surveying the garnets a...
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Chapter
Experimental Study of a 4 K Pulse Tube Cryocooler
A prototype two-stage pulse tube cryocooler was previously developed that uses a double-inlet configuration. When the second-stage regenerator was filled with conventional magnetic regenerator materials, Er ...
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Chapter and Conference Paper
A 32-Channel MCG System Cooled by a GM/JT Cryocooler
Most SQUID systems for biomagnetic measurements use liquid helium as a cryogen. To reduce operating costs and to eliminate the need for handling liquid helium, SQUID systems cooled by small closed-cycle cryoco...
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Chapter and Conference Paper
Development of a 61-Channel MEG System Cooled by a GM/JT Cryocooler
Most SQUID-based systems used for biomagnetic measurements require liquid helium to achieve a low temperature environment However, cryogenic temperatures can now be easily attained by using commercially availa...
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Chapter and Conference Paper
A Cryocooled SQUID System with Minimal Clearance Between the Pick-up Coil and the Specimen
We have developed a SQUID system that have a clearance of about 3 mm between the pick-up coil and the specimen and is cooled by a Gifford-McMahon (GM)/Joule-Thomson (JT) cryocooler. Previous work showed that c...
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Article
Universal conductance in quantum wires in the presence of Umklapp scattering
The effects of Umklapp scattering on the zero-temperature conductance in one-dimensional quantum wires are reexamined by taking into account both the screening of external potential and the non-uniform chemica...
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Chapter and Conference Paper
Active Mode-Locking Using Fast Electro-Optic Deflector
Recently, an ultrafast electro-optic deflector (EOD) has developed into a picosecond pulse generator [1], an optical streak camera [2], a picosecond optical Fourier transformer [3], and so on. Here, we propose...
