Majorana bound state in rotating superfluid 3He-A between parallel plates (2008)
Tsutsumi, Y., Kawakami, T., Mizushima, T., Ichioka, M., Machida, K.
A concrete and experimentally feasible example for testing the putative Majorana zero energy state bound in a vortex is theoretically proposed for a parallel plate geometry of superfluid $^3$He-A...
Mizushima, T., Ichioka, M., Machida, K.
The Majorana zero energy mode of the vortex core and the edge mode are investigated in chiral p-wave superfluid Fermi gases near p-wave Feshbach resonance. We find that they survive until the strong...
Suzuki, K. M., Mizushima, T., Ichioka, M., Machida, K.
The core structure of multiply quantized vortices is theoretically investigated in fermionic superfluid near Feshbach resonance. Under population imbalance in two hyperfine spin states, the vortex...
Yano, K., Sakakibara, T., Tayama, T., Yokoyama, M., Amitsuka, H., Homma, Y., ...
To identify the superconducting gap structure in URu2Si2 we perform field-angle-dependent specific heat measurements for the two principal orientations in addition to field rotations, and theoretical...
Pauli Paramagnetic Effects on Vortices in Superconducting TmNi2B2C (2007)
DeBeer-Schmitt, L., Eskildsen, M. R., Ichioka, M., Machida, K., Jenkins, N., Dewhurst, C. D., ...
The magnetic field distribution around the vortices in TmNi2B2C in the paramagnetic phase was studied experimentally as well as theoretically. The vortex form factor, measured by small-angle neutron...
Is Sr2RuO4 a triplet superconductor? (2007)
The field dependence of the specific heat \gamma(H) at lower temperatures in Sr2RuO4 is analyzed by solving microscopic Eilenberger equation numerically. We find that systematic \gamma(H) behaviors...
Imbalanced Superfluid Phase of a Trapped Fermi Gas in the BCS-BEC Crossover Regime (2007)
Mizushima, T., Ichioka, M., Machida, K.
We theoretically investigate the ground state of trapped neutral fermions with population imbalance in the BCS-BEC crossover regime. On the basis of the single-channel Hamiltonian, we perform full...
Takigawa, M., Ichioka, M., Kuroki, K., Asano, Y., Tanaka, Y.
This Letter theoretically discusses quasiparticle states and nuclear spin relaxation rates T_1^-1 in the quasi-one-dimensional superconductor (TMTSF)2PF6 under a magnetic field applied parallel to...
Theory of tunneling spectroscopy in the Larkin-Ovchinnikov state (2006)
Tanaka, Y., Asano, Y., Ichioka, M., Kashiwaya, S.
A theory of the tunneling spectroscopy of normal metal / Larkin-Ovchinnikov (LO) state is presented by fully taking account of the periodic modulation of pair potentials in real space. The resulting...
Vortex Core Structure in Neutral Fermion Superfluids with Population Imbalance (2006)
Takahashi, M., Mizushima, T., Ichioka, M., Machida, K.
Quantized vortex core structure is theoretically investigated in Fermion superfluids with population imbalance for two atom species of neutral atom clouds near a Feshbach resonance. In contrast with...
Nakai, N., Miranovic, P., Ichioka, M., Hess, H. F., Uchiyama, K., Nishimori, H., ...
It is demonstrated theoretically and experimentally that the low energy density of states $N(E)$ is described by a singular V-shape form $N(E)=N_0(H)+\alpha |E|+O(E^2)$ for all clean superconductors...
Specific heat and low-lying excitations in the mixed state for a type II superconductor (2006)
Nakai, N., Miranovic, P., Ichioka, M., Machida, K.
Low temperature behavior of the electronic specific heat $C(T)$ in the mixed state is by the self-consistent calculation of the Eilenberger theory. In addition to $\gamma T$-term ($\gamma$ is a...
Generic Phase Diagram of Fermion Superfluids with Population Imbalance (2006)
Machida, K., Mizushima, T., Ichioka, M.
It is shown by microscopic calculations for trapped imbalanced Fermi superfluids that the gap function has always sign changes, i.e., the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state like, up to a...
Generic phase diagram of fermion superfluids with population imbalance (2006)
Machida, K, Mizushima, T, Ichioka, M
It is shown by microscopic calculations for trapped imbalanced Fermi superfluids that the gap function always has sign changes, i.e., the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO)-like state, up to a...
Adachi, H., Miranović, P., Ichioka, M., Machida, K.
We study the basal-plane anisotropies of reversible magnetization and torque in a mixed state of layered d-wave superconductors based on the quasiclassical version of the BCS-Gor'kov theory. Both the...
Topological Structure of a Vortex in Fulde-Ferrell-Larkin-Ovchinnikov State (2005)
Mizushima, T., Machida, K., Ichioka, M.
We find theoretically that the vortex core in the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state is quite different from the ordinary core by a simple topological reason. The intersection point of a...
Mixed-State Thermodynamics of Superconductors with Moderately Large Paramagnetic Effects (2005)
Adachi, H., Ichioka, M., Machida, K.
Effects of Pauli paramagnetism on thermodynamic quantities in a vortex state, such as the specific heat $C$ and magnetization $M$, are studied using the quasiclassical Eilenberger formalism. We...
Adachi, H., Miranović, P., Ichioka, M., Machida, K.
Effects of anisotropic gap structures on a diamagnetic response are investigated in order to demonstrate that the field-angle-resolved magnetization ($M_L(\chi)$) measurement can be used as a...
Adachi, H, Miranovic, P, Ichioka, M, Machida, K
The effects of anisotropic gap structures on a diamagnetic response are investigated in order to demonstrate that the field-angle-resolved magnetization [M-L (chi)] measurement can be used as a...
Direct Imaging of Spatially Modulated Superfluid Phases in Atomic Fermion Systems (2004)
Mizushima, T., Machida, K., Ichioka, M.
It is proposed that the spatially modulated superfluid phase, or the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state could be observed in resonant Fermion atomic condensates which are realized...
How to detect gap nodes of a superconductor by angle-resolved specific heat experiment? (2004)
Miranovic, P., Ichioka, M., Machida, K., Nakai, N.
The specific heat oscillation in the mixed state of type II superconductors is studied theoretically when rotating field within a plane containing gap minimum and maximum. The calculations are...
Nakai, N., Miranović, P., Ichioka, M., Machida, K.
It is shown theoretically that the Sommerfeld coefficient $\gamma(B)$ in the mixed state contains useful information on the gap topology in a superconductor. We accurately evaluate $\gamma(B)$...
Kadono, R., Higemoto, W., Koda, A., Larkin, M. I., Luke, G. M., Savici, A. T., ...
The vortex core radius \rv, defined as the peak position of the supercurrent around the vortex, has been determined by muon spin rotation measurements in the mixed state of \lscox for $x=0.13$, 0.15,...
The effect of nonmagnetic impurities on the local density of states in s-wave superconductors (2003)
Miranovic, P., Ichioka, M., Machida, K.
We study the effect of nonmagnetic impurities on the local density of states (LDOS) in s-wave superconductors. The quasiclassical equations of superconductivity are solved selfconsistently to show...
Miranovic, P., Nakai, N., Ichioka, M., Machida, K.
Orientational field-dependence of the zero energy density of states (ZEDOS) is calculated for superconductors with the polar state (line node), axial state (point node) and 3D d-wave state. Depending...
Beliaev Damping and Kelvin Mode Spectroscopy of a Condensate in the Presence of a Vortex Line (2002)
Mizushima, T., Ichioka, M., Machida, K.
It is demonstrated theoretically that the counter-rotating quadrupole mode in a vortex of Bose-Einstein condensates can decay into a pair of Kelvin modes via Beliaev process. We calculate the...
Reentrant vortex lattice transformation in four-fold symmetric superconductors (2002)
Nakai, N., Miranović, P., Ichioka, M., Machida, K.
The physics behind the rhombic$\to$square$\to$rhombic flux line lattice transformation in increasing fields is clarified on the basis of Eilenberger theory. We demonstrate that this reentrance...
Vortex Structure in d-wave superconductors (1999)
M. Ichioka, N. Hayashi, N. Enomoto, K. Machida
Vortex structure of pure d x 2 0y 2-wave superconductors is microscopically analyzed in the framework of the quasi-classical Eilenberger equations. Selfconsistent solution for the d-wave pair...
Fundamental Properties of a Vortex in a D-Wave Superconductor (1999)
M. Ichioka, N. Hayashi, N. Enomoto
this paper is to analyze the vortex structure for a dwave pairing beyond the GL framework, namely, within the quasi-classical Eilenberger theory. We will conclude that reflecting the internal degrees...
Relation between Vortex core charge and Vortex Bound States (1998)
Hayashi, N., Ichioka, M., Machida, K.
Spatially inhomogeneous electron distribution around a single vortex is discussed on the basis of the Bogoliubov-de Gennes theory. The spatial structure and temperature dependence of the electron...
Low-lying Quasiparticle Excitations around a Vortex Core in Quantum Limit (1998)
Hayashi, N., Isoshima, T., Ichioka, M., Machida, K.
Focusing on a quantum-limit behavior, we study a single vortex in a clean s-wave type-II superconductor by self-consistently solving the Bogoliubov-de Gennes equation. The discrete energy levels of...
Comment on ``Quasiparticle Spectra around a Single Vortex in a d-wave Superconductor'' (1997)
In a recent Letter Morita, Kohmoto and Maki analyzed the structure of quasiparticle states near a single vortex in a d-wave superconductor using an approximate version of the Bogoliubov - de Gennes...
Effects of gap anisotropy upon the electronic structure around a superconducting vortex (1997)
Hayashi, N., Ichioka, M., Machida, K.
An isolated single vortex is considered within the framework of the quasiclassical theory. The local density of states around a vortex is calculated in a clean type II superconductor with an...
Star-shaped Local Density of States around Vortices in a Type II Superconductor (1996)
Hayashi, N., Ichioka, M., Machida, K.
The electronic structure of vortices in a type II superconductor is analyzed within the quasi-classical Eilenberger framework. The possible origin of a sixfold ``star'' shape of the local density of...
Vortex structure in $d$-wave superconductors (1995)
Ichioka, M., Hayashi, N., Enomoto, N., Machida, K.
Vortex structure of pure $d_{x^2-y^2}$-wave superconductors is microscopically analyzed in the framework of the quasi-classical Eilenberger equations. Selfconsistent solution for the $d$-wave pair...
Ichioka, M., Enomoto, N., Hayashi, N., Machida, K.
Vortex structure of $d_{x^2-y^2}$-wave superconductors is microscopically analyzed in the framework of the quasi-classical Eilenberger equations. If the pairing interaction contains an $s$-wave...
Fundamental properties of a vortex in a d-wave superconductor (1995)
Ichioka, M., Hayashi, N., Enomoto, N., Machida, K.
The vortex core structure in a d-wave superconductor is analyzed on the basis of the quasi-classical Eilenberger theory beyond the Ginzburg-Landau framework. The current and magnetic field...