96 citations · 536 across the 25 of their papers we have counts for
25 papers
Real-time dynamics of triplet-resonant tunneling driven by nonequilibrium phonons
Kazuyuki Kuroyama, Sasha R. Valentin, Arne Ludwig +4
Driven nonequilibrium systems can host emergent functionalities beyond equilibrium, but real-time access to excited-state dynamics remains limited. Here we report real-time measure…
Josephson diode effect derived from short-range coherent coupling
Sadashige Matsuo, Takaya Imoto, Tomohiro Yokoyama +6
Superconducting devices with broken time-reversal and spatial-inversion symmetries can exhibit novel superconducting phenomena. The observation of superconducting diode effects, wh…
Engineering of anomalous Josephson effect in coherently coupled Josephson junctions
Sadashige Matsuo, Takaya Imoto, Tomohiro Yokoyama +6
A Josephson junction (JJ) is a key device in the development of superconducting circuits, wherein a supercurrent in the JJ is controlled by the phase difference between the two sup…
Phase-dependent Andreev molecules and superconducting gap closing in coherently coupled Josephson junctions
Sadashige Matsuo, Takaya Imoto, Tomohiro Yokoyama +8
The Josephson junction (JJ) is an essential element of superconducting (SC) devices for both fundamental and applied physics. The short-range coherent coupling of two adjacent JJs…
Phonon-mediated spin dynamics in a two-electron double quantum dot under a phonon temperature gradient
Kazuyuki Kuroyama, Sadashige Matsuo, Seigo Tarucha +1
We have theoretically studied phonon-mediated spin-flip processes of electrons in a GaAs double quantum dot (DQD) holding two spins, under a phonon temperature gradient over the DQ…
Observation of nonlocal Josephson effect on double InAs nanowires
Sadashige Matsuo, Joon Sue Lee, Chien-Yuan Chang +4
Short-range coherent coupling of two Josephson junctions (JJs) are predicted to generate a supercurrent in one JJ nonlocally modulated by the phase difference in the other. We repo…
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…
Real-time observation of charge-spin cooperative dynamics driven by a nonequilibrium phonon environment
Kazuyuki Kuroyama, Sadashige Matsuo, Jo Muramoto +6
Quantum dots are recognized as a suitable platform for studying thermodynamic phenomena involving single electronic charges and spins in nano-scale devices. However, such a thermod…
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…
Full Counting Statistics of Spin-Flip/Conserving Charge Transitions in Pauli-Spin Blockade
Sadashige Matsuo, Kazuyuki Kuroyama, Shunsuke Yabunaka +4
We investigate the full counting statistics (FCS) of spin-conserving and spin-flip charge transitions in Pauli-spin blockade regime of a GaAs double quantum dot. A theoretical mode…
Charge transport of a spin-orbit-coupled Luttinger liquid
Chen-Hsuan Hsu, Peter Stano, Yosuke Sato +3
The charge transport of a (Tomonaga-)Luttinger liquid with tunnel barriers exhibits universal scaling: the current-voltage curves measured at various temperatures collapse into a s…
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…
Quantum state transfer of angular momentum via single electron photo-excitation from a Zeeman-resolved light hole
Kazuyuki Kuroyama, Marcus Larsson, Jo Muramoto +9
Electron spins in GaAs quantum dots have been used to make qubits with high-fidelity gating and long coherence time, necessary ingredients in solid-state quantum computing. The qua…
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…
A single eletron-photon pair generation from a single polarization-entangled photon pair
Kazuyuki Kuroyama, Marcus Larsson, Sadashige Matsuo +6
We demonstrate paired generation of a single photo-electron in a quantum dot and a single photon from a single polarization-entangled photon pair that is generated by spontaneous p…
Gate tunable parallel double quantum dot in InAs double-nanowire junctions
S. Baba, S. Matsuo, H. Kamata +4
We report fabrication and measurement of a device where closely-placed two parallel InAs nanowires (NWs) are contacted by source and drain normal metal electrodes. Established tech…
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…
Anomalous behavior of 1/f noise in graphene near the charge neutrality point
Shunpei Takeshita, Sadashige Matsuo, Takahiro Tanaka +6
We investigate the noise in single layer graphene devices from equilibrium to far from equilibrium and found that the 1/f noise shows an anomalous dependence on the source-drain bi…
Experimental Proof of Universal Conductance Fluctuation in Quasi-1D Epitaxial BiSe Wires
Sadashige Matsuo, Kensaku Chida, Daichi Chiba +8
We report on conductance fluctuation in quasi-one-dimensional wires made of epitaxial BiSe thin film. We found that this type of fluctuation decreases as the wire lengt…
Low-frequency and shot noises in CoFeB/MgO/CoFeB magnetic tunneling junctions
Tomonori Arakawa, Takahiro Tanaka, Kensaku Chida +7
The low-frequency and shot noises in spin-valve CoFeB/MgO/CoFeB magnetic tunneling junctions were studied at low temperature. The measured 1/f noise around the magnetic hysteresis…
Observation of finite excess noise in the voltage-biased quantum Hall regime as a precursor for breakdown
Kensaku Chida, Tomonori Arakawa, Sadashige Matsuo +7
We performed noise measurements in a two-dimensional electron gas to investigate the nonequilibrium quantum Hall effect (QHE) state. While excess noise is perfectly suppressed arou…