117 citations · 549 across the 20 of their papers we have counts for
20 papers
Torsional oscillation of carbon nanotubes driven by electron spins
Koji Yamada, Wataru Izumida, Mamoru Matsuo +1
We theoretically investigate the current-induced excitation of torsional vibrations in a suspended carbon nanotube (CNT) quantum dot. By considering a CNT clamped between half-meta…
Dynamics of quantum cellular automata electron transition in triple quantum dots
Takumi Aizawa, Motoya Shinozaki, Yoshihiro Fujiwara +5
The quantum cellular automata (QCA) effect is a transition in which multiple electron move coordinately by Coulomb interactions and observed in multiple quantum dots. This effect w…
Curvature-induced valley-dependent spin-orbit interaction
A. Yamakage, T. Sato, R. Okuyama +5
We construct a general theoretical framework for describing curvature-induced spin-orbit interactions on the basis of group theory. Our theory can systematically determine the emer…
Einstein-de Haas Nanorotor
W. Izumida, R. Okuyama, K. Sato +2
We propose a nanoscale rotor embedded between two ferromagnetic electrodes that is driven by spin injection. The spin-rotation coupling allows this nanorotor to continuously receiv…
Thermally assisted Pauli spin blockade in double quantum dots
M. Kondo, S. Miyota, W. Izumida +2
We investigate the influence of thermal energy on the current flow and electron spin states in double quantum dots in series. The quadruplet Pauli spin blockade, which is caused by…
Topologically protected, correlated end spin formation in carbon nanotubes
Cătălin Paşcu Moca, Wataru Izumida, Balázs Dóra +3
For most chiralities, semiconducting nanotubes display topologically protected end states of multiple degeneracies. We demonstrate using density matrix renormalization group based…
Topological classification of the single-wall carbon nanotube
Rin Okuyama, Wataru Izumida, Mikio Eto
The single-wall carbon nanotube (SWNT) can be a one-dimensional topological insulator, which is characterized by a -topological invariant, winding number. Using the ana…
Transverse profile and 3D spin canting of a Majorana state in carbon nanotubes
Lars Milz, Wataru Izumida, Milena Grifoni +1
The full spatial 3D profile of Majorana bound states (MBS) in a nanowire-like setup featuring a semiconducting carbon nanotube (CNT) as the central element is discussed. By accurat…
Majorana quasiparticles in semiconducting carbon nanotubes
Magdalena Marganska, Lars Milz, Wataru Izumida +2
Engineering effective p-wave superconductors hosting Majorana quasiparticles (MQPs) is nowadays of particular interest, also in view of the possible utilization of MQPs in fault-to…
Topology and zero energy edge states in carbon nanotubes with superconducting pairing
W. Izumida, L. Milz, M. Marganska +1
We investigate the spectrum of finite-length carbon nanotubes in the presence of onsite and nearest-neighbor superconducting pairing terms. A one-dimensional ladder-type lattice mo…
Topological Phase Transition in Metallic Single-Wall Carbon Nanotube
Rin Okuyama, Wataru Izumida, Mikio Eto
The topological phase transition is theoretically studied in a metallic single-wall carbon nanotube (SWNT) by applying a magnetic field parallel to the tube. The t…
Angular momentum and topology in semiconducting single-wall carbon nanotubes
W. Izumida, R. Okuyama, A. Yamakage +1
Semiconducting single-wall carbon nanotubes are classified into two types by means of orbital angular momentum of valley state, which is useful to study their low energy electronic…
Valley coupling in finite-length metallic single-wall carbon nanotubes
W. Izumida, R. Okuyama, R. Saito
Degeneracy of discrete energy levels of finite-length, metallic single-wall carbon nanotubes depends on type of nanotubes, boundary condition, length of nanotubes and spin-orbit in…
Quantum energy teleportation in a quantum Hall system
Go Yusa, Wataru Izumida, Masahiro Hotta
We propose an experimental method for a quantum protocol termed quantum energy teleportation (QET), which allows energy transportation to a remote location without physical carrier…
Passivity breaking of a local vacuum state in a quantum Hall system
Go Yusa, Wataru Izumida, Masahiro Hotta
We propose an experimental method for extracting the zero-point energy from a local vacuum state by performing local operations and classical communication (LOCC). We model a quant…
Phonon-assisted tunneling in interacting suspended single wall carbon nanotubes
Wataru Izumida, Milena Grifoni
Transport in suspended metallic single wall carbon nanotubes in the presence of strong electron-electron interaction is investigated. We consider a tube of finite length and discus…
Study on the Kondo effect in the tunneling phenomena through a quantum dot
Osamu Sakai, Wataru Izumida
We review our recent studies on the Kondo effect in the tunneling phenomena through quantum dot systems. Numerical methods to calculate reliable tunneling conductance are developed…
Two-Impurity Kondo Effect in Double-Quantum-Dot Systems - Effect of Interdot Kinetic Exchange Coupling
Wataru Izumida, Osamu Sakai
Tunneling conductance through two quantum dots, which are connected in series to left and right leads, is calculated by using the numerical renormalization group method. As the hop…
Kondo Effect in Single Quantum Dot Systems --- Study with Numerical Renormalization Group Method ---
Wataru Izumida, Osamu Sakai, Yukihiro Shimizu
The tunneling conductance is calculated as a function of the gate voltage in wide temperature range for the single quantum dot systems with Coulomb interaction. We assume that two…
Many Body Effects on Electron Tunneling through Quantum Dots in an Aharonov-Bohm Circuit
Wataru Izumida, Osamu Sakai, Yukihiro Shimizu
Tunneling conductance of an Aharonov-Bohm circuit including two quantum dots is calculated based on the general expression of the conductance in the linear response regime of the b…