135 citations · 488 across the 15 of their papers we have counts for
15 papers
Velocity and confinement of edge plasmons in HgTe-based 2D topological insulators
Alexandre Gourmelon, Elric Frigerio, Hiroshi Kamata +10
High-frequency transport in the edge states of the quantum spin Hall (QSH) effect has to date rarely been explored, though it could cast light on the scattering mechanisms taking p…
Time-resolved measurement of ambipolar edge magnetoplasmon transport in InAs/InGaSb composite quantum wells
Hiroshi Kamata, Hiroshi Irie, Norio Kumada +1
Time-resolved charge transport measurement for one-dimensional edge states is a powerful means for investigating nonequilibrium charge dynamics and underlying interaction effects t…
Quasiparticle trapping at vortices producing Josephson supercurrent enhancement
Yosuke Sato, Kento Ueda, Yuusuke Takeshige +6
The Josephson junction of a strong spin-orbit material under a magnetic field is a promising Majorana fermion candidate. Supercurrent enhancement by a magnetic field has been obser…
Characterization of helical Luttinger liquids in microwave stepped-impedance edge resonators
Alexandre Gourmelon, Hiroshi Kamata, Jean-Marc Berroir +3
Coulomb interaction has important consequences on the physics of quantum spin Hall edge states, weakening the topological protection via two-particle scattering and renormalizing b…
Half-Integer Shapiro Steps in a Short Ballistic InAs Nanowire Josephson Junction
Kento Ueda, Sadashige Matsuo, Hiroshi Kamata +6
We report on half-integer Shapiro steps observed in an InAs nanowire Josephson junction. We observed the Shapiro steps of the short ballistic InAs nanowire Josephson junction and f…
Dynamical separation of bulk and edge transport in HgTe-based 2D topological insulators
Matthieu C. Dartiailh, Simon Hartinger, Alexandre Gourmelon +11
Topological effects in edge states are clearly visible on short lengths only, thus largely impeding their studies. On larger distances, one may be able to dynamically enhance topol…
Strong Electron-Electron Interactions of a Tomonaga--Luttinger Liquid Observed in InAs Quantum Wires
Yosuke Sato, Sadashige Matsuo, Chen-Hsuan Hsu +12
We report strong electron-electron interactions in quantum wires etched from an InAs quantum well, a material known to have strong spin-orbit interactions. We find that the current…
Dominant non-local superconducting proximity effect due to electron-electron interaction in a ballistic double nanowire
Kento Ueda, Sadashige Matsuo, Hiroshi Kamata +8
Cooper pair splitting (CPS) can induce non-local correlation between two normal conductors coupling to a superconductor. CPS into a double one-dimensional electron gas is an approp…
Anomalous modulation of Josephson radiation in nanowire-based Josephson junctions
Hiroshi Kamata, Russell S. Deacon, Sadashige Matsuo +6
We investigate the Josephson radiation of nanowire (NW)-based Josephson junctions in a parallel magnetic field. The Josephson junction made of an InAs NW with superconducting Al le…
Cooper-pair splitting in two parallel InAs nanowires
Shoji Baba, Christian Jünger, Sadashige Matsuo +9
We report on the fabrication and electrical characterization of an InAs double - nanowire (NW) device consisting of two closely placed parallel NWs coupled to a common superconduct…
Magnetic Field Inducing Zeeman Splitting and Anomalous Conductance Reduction of Half-integer Quantized Plateaus in InAs Quantum Wires
Sadashige Matsuo, Hiroshi Kamata, Shoji Baba +4
We report on magnetic field dependence of half-integer quantized conductance plateaus (HQPs) in InAs quantum wires. We observed HQPs at zero applied magnetic field in InAs quantum…
Equal-Spin Andreev Reflection in Junctions of Spin-Resolved Quantum Hall Bulk State and Spin-Singlet Superconductor
Sadashige Matsuo, Kento Ueda, Shoji Baba +5
The recent development of superconducting spintronics has revealed the spin-triplet superconducting proximity effect from a spin-singlet superconductor into a spin-polarized normal…
Fractionalized Wave Packets from an Artificial Tomonaga-Luttinger Liquid
Hiroshi Kamata, Norio Kumada, Masayuki Hashisaka +2
The model of interacting fermion systems in one dimension known as Tomonaga-Luttinger liquid (TLL) provides a simple and exactly solvable theoretical framework, predicting various…
Distributed-element circuit model of edge magnetoplasmon transport
Masayuki Hashisaka, Hiroshi Kamata, Norio Kumada +4
We report experimental and theoretical studies of edge magnetoplasmon (EMP) transport in quantum Hall (QH) devices. We develop a model that allows us to calculate the transport coe…
Voltage-controlled Group Velocity of Edge Magnetoplasmon in the Quantum Hall Regime
Hiroshi Kamata, Takeshi Ota, Koji Muraki +1
We investigate the group velocity of edge magnetoplasmons (EMPs) in the quantum Hall regime by means of time-of-flight measurement. The EMPs are injected from an Ohmic contact by a…