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Research Output 1981 2019

  • 831 Citations
  • 15 h-Index
  • 75 Article
  • 1 Conference contribution
  • 1 Comment/debate
2019
1 Citation (Scopus)

Dynamical Properties of the Finite-size Dicke Model Coupled to a Thermal Reservoir

Imai, R. & Yamanaka, Y., 2019 Jan 1, In : Journal of the Physical Society of Japan. 88, 2, 024401.

Research output: Contribution to journalArticle

counters
cavities
photons
energy
2018
3 Citations (Scopus)

Bose-Einstein condensation of α clusters and new soft mode in C 12 - Fe 52 4N nuclei in a field-theoretical superfluid cluster model

Katsuragi, R., Kazama, Y., Takahashi, J., Nakamura, Y., Yamanaka, Y. & Ohkubo, S., 2018 Oct 3, In : Physical Review C. 98, 4, 044303.

Research output: Contribution to journalArticle

condensation
nuclei
excitation
operators
nuclear models

New description to soft modes in N-alpha cluster states as Bose-Einstein condensation based on quantum field theory with zero mode excitation

Takahashi, J., Katsuragi, R., Kazama, Y., Nakamura, Y., Yamanaka, Y. & Ohkubo, S., 2018 Nov 13, Proceedings of the 4th International Workshop on State of the Art in Nuclear Cluster Physics, SOTANCP 2018. Folden, C. M., Goldberg, V. Z., Rogachev, G. V. & Barbui, M. (eds.). American Institute of Physics Inc., Vol. 2038. 020024

Research output: Chapter in Book/Report/Conference proceedingConference contribution

condensation
operators
broken symmetry
energy levels
excitation
expansion
differential equations
operators
energy
broken symmetry
leakage
photons
eigenvectors
thermodynamics
2017
2 Citations (Scopus)

Thermal and quantum fluctuations of confined Bose–Einstein condensate beyond the Bogoliubov approximation

Nakamura, Y., Kawaguchi, T., Torii, Y. & Yamanaka, Y., 2017 Jan 1, In : Annals of Physics. 376, p. 484-498 15 p.

Research output: Contribution to journalArticle

condensates
augmentation
approximation
depletion
breakdown
2016
Bose-Einstein condensates
vortices
counters
eigenvalues
quantum numbers
10 Citations (Scopus)

Effective field theory of Bose-Einstein condensation of α clusters and Nambu-Goldstone-Higgs states in C 12

Nakamura, Y., Takahashi, J., Yamanaka, Y. & Ohkubo, S., 2016 Jul 19, In : Physical Review C - Nuclear Physics. 94, 1, 014314.

Research output: Contribution to journalArticle

condensation
operators
broken symmetry
decay
excitation
2015
condensates
solitary waves
formulations
breakdown
Bogoliubov theory
2014
modulation
atoms
frequency modulation
harmonics
2 Citations (Scopus)

Dynamical instability induced by the zero mode under symmetry breaking external perturbation

Takahashi, J., Nakamura, Y. & Yamanaka, Y., 2014, In : Annals of Physics. 347, p. 250-260 11 p.

Research output: Contribution to journalArticle

broken symmetry
perturbation
eigenvalues
Bose-Einstein condensates
condensates
7 Citations (Scopus)
Bose-Einstein condensates
formulations
operators
approximation
commutation
2013
5 Citations (Scopus)

From classical mechanics with doubled degrees of freedom to quantum field theory for nonconservative systems

Kuwahara, Y., Nakamura, Y. & Yamanaka, Y., 2013 Dec 9, In : Physics Letters, Section A: General, Atomic and Solid State Physics. 377, 43, p. 3102-3105 4 p.

Research output: Contribution to journalArticle

classical mechanics
degrees of freedom
formalism
Green's functions
matrices
5 Citations (Scopus)

From superoperator formalism to nonequilibrium Thermo Field Dynamics

Nakamura, Y. & Yamanaka, Y., 2013 Apr, In : Annals of Physics. 331, p. 51-69 19 p.

Research output: Contribution to journalArticle

formalism
excitation
energy
specifications
formulations
2011
6 Citations (Scopus)

Canonical quantization for a relativistic neutral scalar field in non-equilibrium thermo field dynamics

Mizutani, Y., Inagaki, T., Nakamura, Y. & Yamanaka, Y., 2011 Oct, In : Progress of Theoretical Physics. 126, 4, p. 681-701 21 p.

Research output: Contribution to journalArticle

scalars
equations of motion
counters
operators
interactions
1 Citation (Scopus)
insulators
traps
excitation
harmonics
shrinkage
2 Citations (Scopus)
formalism
temperature
quantum mechanics
momentum
formulations
5 Citations (Scopus)
condensates
atoms
formulations
expansion
decay
2010
5 Citations (Scopus)

Derivation of non-Markovian transport equations for trapped cold atoms in nonequilibrium thermal field theory

Nakamura, Y., Sunaga, T., Mine, M., Okumura, M. & Yamanaka, Y., 2010 Feb, In : Annals of Physics. 325, 2, p. 426-441 16 p.

Research output: Contribution to journalArticle

derivation
atoms
Bose-Einstein condensates
collisions
2009
3 Citations (Scopus)

Analytical study of the splitting process of a multiply-quantized vortex in a Bose-Einstein condensate and collaboration of the zero and complex modes

Kobayashi, K., Nakamura, Y., Mine, M. & Yamanaka, Y., 2009 Nov, In : Annals of Physics. 324, 11, p. 2359-2371 13 p.

Research output: Contribution to journalArticle

Bose-Einstein condensates
vortices
completeness
condensates
conservation
2008
14 Citations (Scopus)

Condition for emergence of complex eigenvalues in the Bogoliubov-de Gennes equations

Nakamura, Y., Mine, M., Okumura, M. & Yamanaka, Y., 2008 Apr 1, In : Physical Review A - Atomic, Molecular, and Optical Physics. 77, 4, 043601.

Research output: Contribution to journalArticle

eigenvalues
norms
condensates
vortices
approximation

Quantum field theoretical analysis on unstable behavior of Bose-Einstein condensates in optical lattices

Kobayashi, K., Mine, M., Okumura, M. & Yamanaka, Y., 2008 May, In : Annals of Physics. 323, 5, p. 1247-1270 24 p.

Research output: Contribution to journalArticle

Bose-Einstein condensates
nonlinear equations
eigenvectors
eigenvalues
formulations
2007
5 Citations (Scopus)

Condition for the existence of complex modes in a trapped Bose-Einstein condensate with a highly quantized vortex

Fukuyama, E., Mine, M., Okumura, M., Sunaga, T. & Yamanaka, Y., 2007 Oct 9, In : Physical Review A - Atomic, Molecular, and Optical Physics. 76, 4, 043608.

Research output: Contribution to journalArticle

Bose-Einstein condensates
vortices
condensates
quantum numbers
eigenvalues
Bose-Einstein condensates
vortices
3 Citations (Scopus)

Quantum field theoretical description of dynamical instability of trapped Bose-Einstein condensates

Mine, M., Okumura, M., Sunaga, T. & Yamanaka, Y., 2007 Aug, In : Journal of Low Temperature Physics. 148, 3-4, p. 331-336 6 p.

Research output: Contribution to journalArticle

Hamiltonians
Bose-Einstein condensates
eigenvalues
Atoms
neutral atoms

Quantum field theoretical description of unstable behavior of a Bose-Einstein condensate with a highly quantized vortex in a harmonic potential

Okumura, M., Mine, M., Sunaga, T. & Yamanaka, Y., 2007 Feb, In : Laser Physics. 17, 2, p. 211-214 4 p.

Research output: Contribution to journalArticle

Hamiltonians
Bose-Einstein condensates
condensates
Vortex flow
eigenvalues
13 Citations (Scopus)
Bose-Einstein condensates
eigenvalues
elementary excitations
neutral atoms
condensates
2 Citations (Scopus)

The condition for existence of complex modes in trapped Bose-Einstein condensate with a highly quantized vortex

Sunaga, T., Fukuyama, E., Mine, M., Okumura, M. & Yamanaka, Y., 2007 Aug, In : Journal of Low Temperature Physics. 148, 3-4, p. 381-386 6 p.

Research output: Contribution to journalArticle

Bose-Einstein condensates
Vortex flow
vortices
eigenvalues
expansion
2006
2 Citations (Scopus)

Effect of the zero-mode on the response of a trapped bose-condensed gas

Mine, M., Koide, T., Okumura, M. & Yamanaka, Y., 2006 Apr, In : Progress of Theoretical Physics. 115, 4, p. 683-700 18 p.

Research output: Contribution to journalArticle

theorems
Bose-Einstein condensates
gases
excitation
energy

Effect of zero mode on the response of trapped bose-condensed atoms

Mine, M., Koide, T., Okumura, M. & Yamanaka, Y., 2006 Mar 22, In : Journal of Physics: Conference Series. 31, 1, p. 211-212 2 p.

Research output: Contribution to journalArticle

Bose-Einstein condensates
atoms
frequency response
excitation
theorems
6 Citations (Scopus)
theorems
breakdown
symmetry
gases
boxes
6 Citations (Scopus)

Goldstone theorem, Hugenholtz-Pines theorem, and Ward-Takahashi relation in finite volume Bose-Einstein condensed gases

Enomoto, H., Okumura, M. & Yamanaka, Y., 2006 Aug, In : Annals of Physics. 321, 8, p. 1892-1917 26 p.

Research output: Contribution to journalArticle

theorems
breakdown
symmetry
gases
boxes
2 Citations (Scopus)

Unitarily inequivalent vacua in Bose-Einstein condensation of trapped gases

Okumura, M. & Yamanaka, Y., 2006 Jun 15, In : Physica A: Statistical Mechanics and its Applications. 365, 2, p. 429-445 17 p.

Research output: Contribution to journalArticle

Bose-Einstein Condensation
condensation
Trap
Zero
neutral atoms
2005
8 Citations (Scopus)
Bose-Einstein Condensate
Quantum Field Theory
Condensation
Bose-Einstein condensates
Vacuum
5 Citations (Scopus)
Bose-Einstein Condensation
neutral atoms
Finite Temperature
condensation
Quasiparticles
2004
6 Citations (Scopus)

Effects of Quantum Coordinates on Condensate Density in a Trapped Bose-Einstein Condensate

Okumura, M. & Yamanaka, Y., 2004 Feb, In : Progress of Theoretical Physics. 111, 2, p. 199-211 13 p.

Research output: Contribution to journalArticle

Bose-Einstein condensates
condensates
particle energy
critical temperature
expansion

Nambu-Goldstone mode in trapped bose-einstein condensation

Okumura, M. & Yamanaka, Y., 2004 Jan 1, In : Journal of Modern Optics. 51-6, 7, 1 p.

Research output: Contribution to journalArticle

condensation

Nambu-Goldstone mode in trapped Bose-Einstein condensation

Okumura, M. & Yamanaka, Y., 2004 Apr 15, In : Journal of Modern Optics. 51, 6-7, p. 1101 1 p.

Research output: Contribution to journalArticle

condensation
neutral atoms
condensates
profiles
energy
1 Citation (Scopus)

Response of trapped Bose-Einstein condensates under time-dependent perturbation

Koide, T., Mine, M., Okumura, M. & Yamanaka, Y., 2004 Apr 15, In : Journal of Modern Optics. 51, 6-7, p. 1103-1104 2 p.

Research output: Contribution to journalArticle

Bose-Einstein condensates
perturbation
excitation
deviation
approximation
2003
condensation
commutation
alkali metals
atoms
condensates
17 Citations (Scopus)
condensation
formulations
traps
approximation

Role of nambu-goldstone mode in trapped bose-einstein condensation

Yamanaka, Y., Okumura, M. & Mine, M., 2003, In : Journal of the Physical Society of Japan. 72, SUPPL.C, p. 152-155 4 p.

Research output: Contribution to journalArticle

condensation
trapping
1998

Tunneling time based on the quantum diffusion process approach in multi-channel and optical potential cases

Ohba, I., Imafuku, K. & Yamanaka, Y., 1998 Nov, In : Pramana - Journal of Physics. 51, 5, p. 603-614 12 p.

Research output: Contribution to journalArticle

quantum mechanics
inelastic scattering
1997
22 Citations (Scopus)

Effects of inelastic scattering on tunneling time based on the generalized diffusion process approach

Imafuku, K., Ohba, I. & Yamanaka, Y., 1997, In : Physical Review A - Atomic, Molecular, and Optical Physics. 56, 2, p. 1142-1153 12 p.

Research output: Contribution to journalArticle

quantum mechanics
inelastic scattering
1996

Concept of quasiparticle in thermofield dynamics for nonequilibrium systems

Yamanaka, Y. & Nakamura, K., 1996 Dec, In : Physics Essays. 9, 4, p. 617-623 7 p.

Research output: Contribution to journalArticle

Alberta
5 Citations (Scopus)

Quantum dephasing by chaos

Nakazato, H., Namiki, M., Pascazio, S. & Yamanaka, Y., 1996 Oct 28, In : Physics Letters, Section A: General, Atomic and Solid State Physics. 222, 3, p. 130-136 7 p.

Research output: Contribution to journalArticle

chaos
degrees of freedom
detectors
interactions
2 Citations (Scopus)

Thermal field theory in non-equilibrium states

Henning, P. A., Nakamura, K. & Yamanaka, Y., 1996 Jun 30, In : International Journal of Modern Physics B. 10, 13-14, p. 1599-1614 16 p.

Research output: Contribution to journalArticle

Statistical mechanics
Quantum Effects
Quantum Field Theory
Field Theory
Non-equilibrium
1995
25 Citations (Scopus)

Tunneling time based on the quantum diffusion process approach

Imafuku, K., Ohba, I. & Yamanaka, Y., 1995 Aug 28, In : Physics Letters A. 204, 5-6, p. 329-335 7 p.

Research output: Contribution to journalArticle

simulation
1993
7 Citations (Scopus)

A Time‐Dependent Nonequilibrium Calculational Scheme towards the Study of Temperature Fluctuations

Evans, T. S., Hardman, I., Umezawa, H. & Yamanaka, Y., 1993, In : Fortschritte der Physik. 41, 2, p. 151-175 25 p.

Research output: Contribution to journalArticle

formalism
vacuum
vector spaces
state vectors
ionic collisions