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N Suzumura,M. Yamaguchi,N. Sawaki,Y. Nishimoto 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
The intersubband relaxation processes of electrons in GaAs/AlGaAs mesoscopic disks were investigated by femtosecond reflectance spectroscopy. It was found that the relaxation time in a mesoscopic disk is on the order of sub-picosecond and depends on the shape of the disk. Under the lowest excitation intensity where the relaxation time is independent of the excitation intensity, the LO phonon emission rate is lower than that expected in a bulk GaAs. Moreover the time constant depended on the shape of the disk. A possible origin of the suppression of LO phonon emission rate is discussed from the point of the modification of the scattering cross section in a disk of mesoscopic size.
Carrier Lifetime Reduction in a p-i GaAs/AlGaAs Asymmetric Triple Quantum Well Structure
K. Mizutani,H. S. Ahn,M. Yamaguchi,N. Sawaki,Y. Nishimoto 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.42 No.III
The lifetime of photo-excited carriers in a p-i GaAs/AlGaAs asymmetric triple quantum well structure was investigated by the femto-second pump-probe method. The transmission change of the probe pulse shows the decay of the carriers excited by the pump pulse in the ATQW. The carrier relaxation time was as short as 80 ps in the weak pump beam intensity region. The fast decay is attributed to the hole tunneling in the valence band.
Evidence for a Field-Induced Quantum Spin Liquid in α - RuCl3
Baek, S.-H.,Do, S.-H.,Choi, K.-Y.,Kwon, Y. S.,Wolter, A. U. B.,Nishimoto, S.,van den Brink, Jeroen,Bü,chner, B. American Physical Society 2017 Physical Review Letters Vol.119 No.3
<P>We report a Cl-35 nuclear magnetic resonance study in the honeycomb lattice alpha-RuCl3, a material that has been suggested to potentially realize a Kitaev quantum spin liquid (QSL) ground state. Our results provide direct evidence that alpha-RuCl3 exhibits a magnetic-field-induced QSL. For fields larger than similar to 10 T, a spin gap opens up while resonance lines remain sharp, evidencing that spins are quantum disordered and locally fluctuating. The spin gap increases linearly with an increasing magnetic field, reaching similar to 50 K at 15 T, and is nearly isotropic with respect to the field direction. The unusual rapid increase of the spin gap with increasing field and its isotropic nature are incompatible with conventional magnetic ordering and, in particular, exclude that the ground state is a fully polarized ferromagnet. The presence of such a field-induced gapped QSL phase has indeed been predicted in the Kitaev model.</P>