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22 papers · 1 filter
Phase Transitions in the Bilayer Quantum Hall Effect
N. Kumada, D. Terasawa, Y. Shimoda +6
We measured the magnetoresistance of bilayer quantum Hall (QH) effects at the fractional filling factor by changing the total electron density and the density difference be…
Interplay of Cooper and Kondo singlet formations in high-TC cuprates
T. Sekitani, M. Naito, H. Sato +1
We performed high-field magnetotransport experiments up to 50 T on strained La1.85Sr0.15CuO4 films. Two films with different strain, one expansively strained with Tc ~ 26 K and the…
Electrically-Controlled Nuclear Spin Polarization and Relaxation by Quantum-Hall states
K. Hashimoto, K. Muraki, T. Saku +1
We investigate interactions between electrons and nuclear spins by using the resistance (Rxx) peak which develops near filling factor n = 2/3 as a probe. By temporarily tuning n to…
Synthesis and photoemission study of as-grown superconducting MgB2 thin films
K Ueda, H. Yamamoto, M. Naito
As-grown superconducting thin films of MgB2 were prepared by molecular beam epitaxy (MBE), and studied by X-ray and ultraviolet photoelectron spectroscopy (XPS and UPS). Only films…
Maximum entanglement of quantum-dot systems with single excitation in the spin van der Waals model
A. Miranowicz, S. K. Ozdemir, M. Koashi +2
Time evolution of entanglement of N quantum dots is analyzed within the spin-1/2 van der Waals (or Lipkin-Meshkov-Glick) XY model. It is shown that, for a single dot initially exci…
Conductance renormalization and conductivity of a multi-subband Tomonaga-Luttinger model
Takashi Kimura
We studied the conductance renormalization and conductivity of multi-subband Tomonaga-Luttinger models with inter-subband interactions. We found that, as in single-band systems, th…