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Journal Articles

Ultrahigh conversion efficiency of betavoltaic cell using diamond pn junction

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T. Shimaoka, H. Umezawa, K. Ichikawa, J. Pernot, S. Koizumi
Journal: Applied Physics Letters
Appl. Phys. Lett. 117, 103902 (2020)
https://doi.org/10.1063/5.0020135
Published: September 2020
View articletitled, Ultrahigh conversion efficiency of betavoltaic cell using diamond pn junction
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Includes: Supplementary data
Journal Articles

Response measurement of single-crystal chemical vapor deposition diamond radiation detector for intense X-rays aiming at neutron bang-time and neutron burn-history measurement on an inertial confinement fusion with fast ignition

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T. Shimaoka, J. H. Kaneko, Y. Arikawa, M. Isobe, Y. Sato, M. Tsubota, T. Nagai, S. Kojima, Y. Abe, S. Sakata, S. Fujioka, M. Nakai, H. Shiraga, H. Azechi, A. Chayahara, H. Umezawa, S. Shikata
Journal: Review of Scientific Instruments
Rev. Sci. Instrum. 86, 053503 (2015)
https://doi.org/10.1063/1.4921482
Published: May 2015
View articletitled, Response measurement of single-crystal chemical vapor deposition diamond radiation detector for intense X-rays aiming at neutron bang-time and neutron burn-history measurement on an inertial confinement fusion with fast ignition
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Journal Articles

Spontaneous polarization model for surface orientation dependence of diamond hole accumulation layer and its transistor performance

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K. Hirama, H. Takayanagi, S. Yamauchi, J. H. Yang, H. Kawarada, H. Umezawa
Journal: Applied Physics Letters
Appl. Phys. Lett. 92, 112107 (2008)
https://doi.org/10.1063/1.2889947
Published: March 2008
View articletitled, Spontaneous polarization model for surface orientation dependence of diamond hole accumulation layer and its transistor performance
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Journal Articles

Heisenberg and interaction representations in thermo field dynamics

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T. S. Evans, I. Hardman, H. Umezawa, Y. Yamanaka
Journal: Journal of Mathematical Physics
J. Math. Phys. 33, 370–378 (1992)
https://doi.org/10.1063/1.529915
Published: January 1992
View articletitled, Heisenberg and interaction representations in thermo field dynamics
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Journal Articles

Coherent and thermal coherent state

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A. Mann, M. Revzen, K. Nakamura, H. Umezawa, Y. Yamanaka
Journal: Journal of Mathematical Physics
J. Math. Phys. 30, 2883–2890 (1989)
https://doi.org/10.1063/1.528470
Published: December 1989
View articletitled, Coherent and thermal coherent state
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Journal Articles

Erratum: Canonical formalism of dissipative fields in the thermo field dynamics [J. Math. Phys. 2 8 , 2741 (1987)]

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T. Arimitsu, H. Umezawa, Y. Yamanaka
Journal: Journal of Mathematical Physics
J. Math. Phys. 29, 1518 (1988)
https://doi.org/10.1063/1.527896
Published: June 1988
View articletitled, Erratum: Canonical formalism of dissipative fields in the thermo field dynamics [J. Math. Phys. 2 8 , 2741 (1987)]
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Journal Articles

Temperature dependence of Faraday rotation in Bi‐substituted terbium iron garnet films

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H. Umezawa, Y. Yokoyama, N. Koshizuka
Journal: Journal of Applied Physics
J. Appl. Phys. 63, 3113–3115 (1988)
https://doi.org/10.1063/1.340859
Published: April 1988
View articletitled, Temperature dependence of Faraday rotation in Bi‐substituted terbium iron garnet films
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Journal Articles

Time‐dependent canonical formalism of thermally dissipative fields and renormalization scheme

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I. Hardman, H. Umezawa, Y. Yamanaka
Journal: Journal of Mathematical Physics
J. Math. Phys. 28, 2925–2938 (1987)
https://doi.org/10.1063/1.527694
Published: December 1987
View articletitled, Time‐dependent canonical formalism of thermally dissipative fields and renormalization scheme
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Journal Articles

Canonical formalism of dissipative fields in thermo field dynamics

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T. Arimitsu, H. Umezawa, Y. Yamanaka
Journal: Journal of Mathematical Physics
J. Math. Phys. 28, 2741–2752 (1987)
https://doi.org/10.1063/1.527722
Published: November 1987
View articletitled, Canonical formalism of dissipative fields in thermo field dynamics
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Journal Articles

Feynman rules in the Anderson model: Generalization to the (2J+1)‐component case

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H. Matsumoto, H. Umezawa, J. P. Whitehead
Journal: Journal of Mathematical Physics
J. Math. Phys. 27, 1711–1715 (1986)
https://doi.org/10.1063/1.527087
Published: June 1986
View articletitled, Feynman rules in the Anderson model: Generalization to the (2J+1)‐component case
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Journal Articles

Perturbation theory for polyacetylene‐type kink dynamics model with acoustic phonon effects

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Y. Leblanc, H. Matsumoto, H. Umezawa
Journal: Journal of Mathematical Physics
J. Math. Phys. 26, 2940–2955 (1985)
https://doi.org/10.1063/1.526721
Published: November 1985
View articletitled, Perturbation theory for polyacetylene‐type kink dynamics model with acoustic phonon effects
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Journal Articles

Comments on the perturbed sine–Gordon equation

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N. J. Papastamatiou, H. Matsumoto, H. Umezawa
Journal: Journal of Mathematical Physics
J. Math. Phys. 26, 2205–2207 (1985)
https://doi.org/10.1063/1.526848
Published: September 1985
View articletitled, Comments on the perturbed sine–Gordon equation
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Journal Articles

The theory of ferromagnetic superconductors (invited)

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J. P. Whitehead, H. Matsumoto, H. Umezawa
Journal: Journal of Applied Physics
J. Appl. Phys. 57, 3093–3098 (1985)
https://doi.org/10.1063/1.335170
Published: April 1985
View articletitled, The theory of ferromagnetic superconductors (invited)
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Journal Articles

Anomalous surface impedance in reentrant ferromagnetic superconductors

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C. Y. Huang, C. E. Olsen, G. Kozlowski, H. Matsumoto, H. Umezawa, F. Mancini, M. B. Maple, H. C. Hamaker, M. S. Torikachvili, J. P. Whitehead, F. E. Wang
Journal: Journal of Applied Physics
J. Appl. Phys. 57, 3104–3106 (1985)
https://doi.org/10.1063/1.335172
Published: April 1985
View articletitled, Anomalous surface impedance in reentrant ferromagnetic superconductors
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Journal Articles

An equivalence class of quantum field theories at finite temperature

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H. Matsumoto, Y. Nakano, H. Umezawa
Journal: Journal of Mathematical Physics
J. Math. Phys. 25, 3076–3085 (1984)
https://doi.org/10.1063/1.526023
Published: October 1984
View articletitled, An equivalence class of quantum field theories at finite temperature
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Journal Articles

A perturbative look at the dynamics of extended systems in quantum field theory

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G. Semenoff, H. Matsumoto, H. Umezawa
Journal: Journal of Mathematical Physics
J. Math. Phys. 22, 2208–2222 (1981)
https://doi.org/10.1063/1.524789
Published: October 1981
View articletitled, A perturbative look at the dynamics of extended systems in quantum field theory
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Journal Articles

Extended objects in quantum field theory

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H. Matsumoto, G. Semenoff, H. Umezawa, M. Umezawa
Journal: Journal of Mathematical Physics
J. Math. Phys. 21, 1761–1769 (1980)
https://doi.org/10.1063/1.524627
Published: July 1980
View articletitled, Extended objects in quantum field theory
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Journal Articles

Quantum soliton and classical soliton

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H. Matsumoto, G. Oberlechner, M. Umezawa, H. Umezawa
Journal: Journal of Mathematical Physics
J. Math. Phys. 20, 2088–2096 (1979)
https://doi.org/10.1063/1.523977
Published: October 1979
View articletitled, Quantum soliton and classical soliton
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Journal Articles

Boson Formalism in Superconductivity

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L. Leplae, H. Umezawa
Journal: Journal of Mathematical Physics
J. Math. Phys. 10, 2038–2046 (1969)
https://doi.org/10.1063/1.1664800
Published: November 1969
View articletitled, Boson Formalism in Superconductivity
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Journal Articles

Generalized Ward Identity and Unified Treatment of Conservation Laws

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D. Lurié, Y. Takahashi, H. Umezawa
Journal: Journal of Mathematical Physics
J. Math. Phys. 7, 1478–1483 (1966)
https://doi.org/10.1063/1.1705057
Published: August 1966
View articletitled, Generalized Ward Identity and Unified Treatment of Conservation Laws
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