684 citations · 3.2k across the 51 of their papers we have counts for
17 papers · 1 filter
Charge sensing of few-electron ZnO double quantum dots probed by radio-frequency reflectometry
Kosuke Noro, Motoya Shinozaki, Yusuke Kozuka +6
Zinc oxide (ZnO) has garnered much attention as a promising material for quantum devices due to its unique characteristics. To utilize the potential of ZnO for quantum devices, the…
Negative correlation between the linear and the nonlinear conductance in magnetic tunnel junctions
Shuichi Iwakiri, Satoshi Sugimoto, Yasuhiro Niimi +4
The current-voltage () characteristics beyond the linear response regime of magnetic tunnel junction (MTJ) is systematically investigated. We find a clear negative correlation…
Interplay of spin-orbit coupling and Coulomb interaction in ZnO-based electron system
D. Maryenko, M. Kawamura, A. Ernst +6
Spin-orbit coupling (SOC) is pivotal for various fundamental spin-dependent phenomena in solids and their technological applications. In semiconductors, these phenomena have been s…
Current scaling of the topological quantum phase transition between a quantum anomalous Hall insulator and a trivial insulator
Minoru Kawamura, Masataka Mogi, Ryutaro Yoshimi +5
We report a current scaling study of a quantum phase transition between a quantum anomalous Hall insulator and a trivial insulator on the surface of a heterostructure film of magne…
Microwave response of interacting oxide two-dimensional electron systems
D. Tabrea, I. A. Dmitriev, S. I. Dorozhkin +7
We present an experimental study on microwave illuminated high mobility MgZnO/ZnO based two-dimensional electron systems with different electron densities and, hence, varying Coulo…
Generation of Multipeak Spectrum of Spin Torque Oscillator in Non-linear Regime
Shuichi Iwakiri, Satoshi Sugimoto, Yasuhiro Niimi +4
We investigate the spectral characteristics of spin torque oscillator (STO) excited by the spin Hall-induced spin current. We observe that the modest spin current injection trigger…
Quantised conductance of one-dimensional strongly-correlated electrons in an oxide heterostructure
H. Hou, Y. Kozuka, Jun-Wei Liao +7
Oxide heterostructures are versatile platforms with which to research and create novel functional nanostructures. We successfully develop one-dimensional (1D) quantum-wire devices…
Andreev reflection at the interface with an oxide in the quantum Hall regime
Yusuke Kozuka, Atsushi Sakaguchi, Joseph Falson +2
Quantum Hall/superconductor junctions have been an attractive topic as the two macroscopically quantum states join at the interface. Despite longstanding efforts, however, experime…
Topological quantum phase transition in magnetic topological insulator upon magnetization rotation
Minoru Kawamura, Masataka Mogi, Ryutaro Yoshimi +5
We report a continuous phase transition between quantum-anomalous-Hall and trivial-insulator phases in a magnetic topological insulator upon magnetization rotation. The Hall conduc…
Negative magnetoresistance suppressed through topological phase transition in (Cd1-xZnx)3As2 films
S. Nishihaya, M. Uchida, Y. Nakazawa +7
The newly discovered topological Dirac semimetals host the possibilities of various topological phase transitions through the control of spin-orbit coupling as well as symmetries a…
A cascade of phase transitions in an orbitally mixed half-filled Landau level
J. Falson, D. Tabrea, D. Zhang +6
Half-filled Landau levels host an emergent Fermi-liquid which displays an instability towards pairing, culminating in a gapped even-denominator fractional quantum Hall ground state…
Nonlinear response of a MgZnO/ZnO heterostructure close to zero bias
Q. Shi, M. A. Zudov, J. Falson +4
We report on magnetotransport properties of a MgZnO/ZnO heterostructure subjected to weak direct currents. We find that in the regime of overlapping Landau levels, the differential…
Phase transition from a composite fermion liquid to a Wigner solid in the lowest Landau level of ZnO
D. Maryenko, A. McCollam, J. Falson +4
Interactions between the constituents of a condensed matter system can drive it through a plethora of different phases due to many-body effects. A prominent platform for this type…
Hall field-induced resistance oscillations in MgZnO/ZnO heterostructures
Q. Shi, M. A. Zudov, J. Falson +5
We report on nonlinear magnetotransport in a two-dimensional electron gas hosted in a MgZnO/ZnO heterostructure. Upon application of a direct current, we observe pronounced Hall fi…
Magnetic modulation doping in topological insulators toward higher-temperature quantum anomalous Hall effect
M. Mogi, R. Yoshimi, A. Tsukazaki +5
Quantum anomalous Hall effect (QAHE), which generates dissipation-less edge current without external magnetic field, is observed in magnetic-ion doped topological insulators (TIs),…
Enhanced quantum oscillatory magnetization and non-equilibrium currents in an interacting two-dimensional electron system in MgZnO/ZnO with repulsive scatterers
M. Brasse, S. M. Sauther, J. Falson +6
Torque magnetometry at low temperature and in high magnetic fields B is performed on a MgZnO/ZnO heterostructure incorporating a high-mobility two-dimensional electron system. We f…
Insulating phase of a two-dimensional electron gas in MgZnO/ZnO heterostructure below nu = 1/3
Y. Kozuka, A. Tsukazaki, D. Maryenko +7
We report magnetotransport properties of a two-dimensional electron gas confined at MgZnO/ZnO heterointerface in a high magnetic field up to 26 T. High electron mobility and low ch…