Hsiang-Shun Chou Mail: hschou@mail.ntou.edu.tw 
Education
Ph. D., Physics, National Taiwan University (1990)
Title

● Professor

Specialty
         (1) Theoretical Atomic Physics

         (2) Quantum Optics

 Major Research Areas
        (1)Photon-atom interactions

        (2)Relativistic atomic many-body theory

        (3)Implications of symmetry principles in atomic spectroscopy
　

 Introduction 

My main interest is opical physics,with emphasis on the dynamical and symmetricalproperties of photon-matter interactions. A brief description is as follows.(1)Relativistic many-body dynamical theory of phton-matter interactions  I derived the second-order formola for photoabsorption cross-section within the framework of relativistic many-body perturvation theory(MBPT).Applications of the relativistic MBPT to the spectrum of alkaline-earth atoms have been carried out.Ialso plan to propose relativistic theory of nonlinear optics,with  the purpose of precisely predicting the nonlinear-optical properties of heavy atoms.

(2)Symmety in photon-matter interactions I investigate the implications of fundamental symmetry in quantum optics and laser physics.I demonstarted that laser-induced transparency arises naturally as a consequence of time-reversalsymmetry.I also plan to study the mechanism of lasing without inversion from the viewpoint of time-reversal symmetry.

 Publications

Refereed Papers

  1. Hsiang-Shun Chou , Keh-Ning Huang, and W. R. Johnson, Magnetic Dipole Transitions of Pb-Like Ions from the Multiconfiguration Relativistic Random-Phase Approximation, Phys. Rev. A44, R2769 (1991).

  2. Hsiang-Shun Chou and K-N Huang, Relativistic Excitation Energies and Oscillator Strengths for the (6s2)1S0→(6s6p)3P1, 1P1 Transitions in Hg-Like Ions, Phys. Rev. A45, 1403 (1992).

  3. Hsiang-Shun Chou and K-N Huang, Relativistic Excitation Energies and Oscillator Strengths for the (5s2)1S0→(5s5p)3P1, 1P1 Transitions in Cd-Like Ions, Phys. Rev. A46, 3725 (1992).

  4. Hsiang-Shun Chou , Hsin-Chang Chi, and K-N Huang, Core-Polarization Effects for the Intercombination and Resonance Transitions in Cd-Like Ions, Phys. Rev. A48, 2453 (1993).

  5. Hsiang-Shun Chou , Hsin-Chang Chi, and K-N Huang, Core-Polarization Effects for the (6s2)1S0→(6s6p)3P1, 1P1 Transitions in Hg-Like Ions, J. Phys. B26, 2303 (1993).

  6. Hsiang-Shun Chou , Hsin-Chang Chi, and K-N Huang, Relativistic Excitation Energies and Oscillator Strengths including Core-Polarization Effects for the Intercombination and Resonance Transitions in Mg-Like Ions, J. Phys. B26, 4079 (1993).

  7. Hsiang-Shun Chou , Hsin-Chang Chi, and K-N Huang, Core-Polarization Effects in the 3P1-1P1 Separations of Cd-Like and Hg-Like Ions, Phys. Lett. A182, 302 (1993).

  8. Hsiang-Shun Chou , Hsin-Chang Chi, and K-N Huang, Relativistic Excitation Energies and Oscillator Strengths for Transitions in Zn-Like Ions including Core-Polarization Effects, Phys. Rev. A49, 2394 (1994).

  9. Hsiang-Shun Chou , Hsin-Chang Chi, and K-N Huang, Core-Polarization Effects on the Intercombination and Resonance Transitions in Be-Like Ions, Chin. J. Phys. 32, 261 (1994).

  10. Hsiang-Shun Chou and K-N Huang, Implications of Parity and Time-Reversal Symmetries in Atoms, Chin. J. Phys. 32, 171 (1994).

  11. K-N Huang, Hsin-Chang Chi, and Hsiang-Shun Chou, The MCRRPA Theory and its Applications to Photoexcitation and Photoionization, Chin. J. Phys. 33, 565 (1995).

  12. Hsiang-Shun Chou , Jieh-Yi Chang, Yun-Hsiung Chang, and K-N Huang, Energy-Level Scheme and Transition Probabilities of S-Like Ions, At. Data Nucl. Data Tables 62, 77 (1996).

  13. Hsiang-Shun Chou and K-N Huang, Core-Shielding Effects on Photoexcitation of the Hg-Like Ions, Chin. J. Phys. 35, 35 (1997).

  14. Hsiang-Shun Chou and W. R. Johnson, Relativistic Calculations of Transition Rates for Copper-Like, Silver-Like, and Gold-Like Ions, Phys. Rev. A56, 2424 (1997).

  15. Hsiang-Shun Chou, Relativistic Many-Body Calculations of Transition Amplitudes for Berylliumlike Ions, Phys. Rev. A62, 42507 (2000).

  16. Hsiang-Shun Chou,Fine-Structure Splittings in S-like Ions, Chin. J. Phys. 38, 914 (2000).

  17. Hsiang-Shun Chou, Calculations for Transition Rates of Beryllium-Like Ions, Chin. J. Phys. 39, 41 (2001).

  18. Hsiang-Shun Chou, Laser-Induced Transparency as a Consequence of Time-Reversal Symmetry, Nucl. Phys. A684, 716C-718C (2001).

  19. Hsiang-Shun Chou, On the Overall Permutation Symmetry for the Nonlinear Susceptibility, Chin. J. Phys. 39, 172 (2001).

  20. Hsiang-Shun Chou, Comments on " Relativistic Many-Body Calculations of Transition Probabilities for the 2l12l2[LSJ]-2l32l4[L' S' J'] Lines in the Be-like Ions", Physica Scripta 63, 140 (2001).

  21. Hsiang-Shun Chou, On the Time-Reversal Invariance of the Fundamental Commutation Relation, Chin. J. Phys. 42, xxx (2004).

Conference Papers

  1. Hsiang-Shun Chou and K-N Huang, Multiconfiguration Dirac-Fock Theory including Parity and Time-Reversal Nonconserving Interactions, Progress in Nuclear Physics (Elsevier, New York, 1991), pp. 315-327.

  2. Hsiang-Shun Chou , Hsin-Chang Chi, and K-N Huang, Core-Polarization Effects for the Resonance and Intercombination Transitions in Cd-Like Ions, XVIII International Conference on the Physics of Electronic and Atomic Collisions, Aarhus, Denmark, 21-27 July 1993.

  3. Hsiang-Shun Chou , Hsin-Chang Chi, and K-N Huang, Relativistic Calculations for the Intercombination and Resonance Transitions in the Hg Sequence, The Seventh International Conference on the Physics of Highly Charged Ions, Vienna, Austria, 19-23 September 1994.

  4. Hsiang-Shun Chou, Fine-Structure Splittings in S-Like Ions, 5th International Colloquium on Atomic Spectra and Oscillator Strengths for Astrophysical and Laboratory Plasmas, Paris, France, 28-31 August 1995.

  5. Hsiang-Shun Chou,Implications of Time-Reversal Symmetry in Quantum Interference, 15th International Conference on Atomic Physics, Amsterdam, Netherland, 5-9 August 1996.

  6. Hsiang-Shun Chou, and W. R. Johnson, Relativistic Many-Body-Perturbation Calculations of Transition Rates for Be-Like Ions, Joint April APS/AAPT Meeting, Washington D C, USA, 18-21 April 1997.

  7. Hsiang-Shun Chou, and W. R. Johnson, Relativistic Many-Body Calculations of Transition Rates for Be-Like Ions, XIVth Europhysics Conference on Atomic and Molecular Physics of Ionized Gases, Dublin, Irland, 26-29 August 1998.

  8. Hsiang-Shun Chou, Relativistic Many-Body Calculations of Transition Amplitudes for Beryllium-Like Ions, Annual Meeting of the Physical Society of the Republic of China, Taipei, Taiwan, 4-5 February 1999.

  9. Hsiang-Shun Chou, Laser-Induced Transparency as a Consequence of Time-Reversal Symmetry, Annual Meeting of the Physical Society of the Republic of China, Tanan, Taiwan, 31 January- 1 February 2000.

  10. Hsiang-Shun Chou, Laser-Induced Transparency as a Consequence of Time-Reversal Symmetry, 16th IUPAP International Conference on Few-Body Problems in Physics, Taipei, Taiwan, 6-10 March 2000.

  11. Hsiang-Shun Chou, Relativistic Many-Body Perturbation Calculations of Transition Amplitudes for Beryllium-Like Ions, 16th IUPAP International Conference on Few-Body Problems in Physics, Taipei, Taiwan, 6-10 March 2000.

  12. Hsiang-Shun Chou, Self-Induced Suppression Effect in Nonlinear Optical Processes as a Consequence of Time-Reversal Symmetry, The 8th Asia Pacific Physics Conference, Taipei, Taiwan, 7-10 August 2000.

  13. Hsiang-Shun Chou, Relativistic Many-Body Calculations of Transition Amplitudes for Be-Like Ions, The Fourth Asian International Seminar on Atomic and Molecular Physics, Taipei, Taiwan, 13-18 October 2000.

  14. Hsiang-Shun Chou, Self-Induced Suppression Effect in Nonlinear Optical Processes as a Consequence of Time-Reversal Symmetry, Ultraintense Laser Interactions and Applications-2, Pisa, Italy, 29 September- 3 October 2000.

  15. Hsiang-Shun Chou, The Symmetry Origin of Lasing Without Inversion, Annual Meeting of the Physical Society of the Republic of China, Taipei, Taiwan, 12-14 February 2001.

  16. Hsiang-Shun Chou, Relativistic Many-Body Calculations of Atoms with two Valence Electrons, Annual Meeting of the Physical Society of the Republic of China, Taipei, Taiwan, 12-14 February 2001.

  17. Hsiang-Shun Chou, Role of Gauge Symmetry in the Electromagnetically Induced Transparency, Annual Meeting of the Physical Society of the Republic of China, Hualien, Taiwan, 12-14 February 2003.

  18. Hsiang-Shun Chou, Role of Symmetry Principles in the Electromagnetically Induced Transparency, 35th Conference of the European Group for Atomic Spectroscopy, Brussels, Belgium, 15-18 July 2003.

  19. Hsiang-Shun Chou, Role of Symmetry Principles in the Electromagnetically Induced Transparency, Optics and Photonics Taiwan' 03, Taipei, Taiwan, 25-26 Decmber 2003.

  20. Hsiang-Shun Chou, On the Time-Reverasl Invariance of the Fundamental Commutaion Relation, Annual Meeting of the Physical Society of the Republic of China, Hsinchu, Taiwan, 9-11 February 2004.

others

(1).周祥順，無反置雷射簡介，物理雙月刊，23 卷 5期，564頁 (2001).

(2).周祥順，原子光譜中的自發抑制現象，物理雙月刊，25卷2期，324頁(2003).

　

中文簡介

本人研究領域為理論原子物理及量子光學，主要興趣為探討光與原子交互作用的動力及對稱性質。茲分述如下：
　

一、光與原子交互作用的相對論性多體動力理論:

  本人推導出相對論性多體微擾理論二階光吸收截面公式，並用以研究鹼土族元素光譜。此外，本人也嘗試建立相對論性非線性光學理論，期望能用相對論性多體理論精確地計算重原子的非線性光學性質。未來本人也將探討原子在強雷射光中的性質。

二、光與原子交互作用的對稱性質:

  本人由對稱性原理探討量子光學及雷射物理中的各種現象。本人證明非線性光學過程中的自發抑制現象是時間倒轉對稱的必然結果。本人證明電磁誘發透明及無反置雷射的終極物理機制是時間倒轉對稱或規範對稱。未來本人將從對稱性原理的觀點探討新的操控原子光學性質的方法。

English introduction
     My main interest is theoretical atomic physics, with focus on  the dynamical and symmetry properties of photon-atom interactions. A brief description is as follows.
　
(1)Relativistic many-body dynamical theory of photon-atom interactions:
    I derived the second-order formula for photo absorption cross-section within the framework of relativistic many-body perturbation theory (MBPT). Applications of the relativistic  MBPT to the spectrum of alkaline-earth atoms have been carried out. I also plan to propose relativistic theory of nonlinear optics, with the purpose of precisely predicting the  nonlinear-optical properties of heavy atoms.

(2)Symmety properties of  photon-atom interactions:
    I investigate the implications of fundamental symmetry in quantum optics and laser physics. I demonstrated that the self-induced suppression effect in nonlinear-optical processes arises naturally as a consequence of time-reversal symmetry. I also showed that the ultimate origin of the electromagnetically induced transparency and the lasing without inversion is the time-reversal symmetry or the gauge symmetry. In the future, I will propose new methods for manipulating the optical properties of atoms from the viewpoint of symmetry principles.