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物理組主持人(Division PI)(2014.1.1~)



陳 俊 瑋

教 授
1999 年華盛頓大學物理博士
電話:(02)3366-5198
Email:jwc@phys.ntu.edu.tw
教學和研究領域

目前教授物理系電磁學(大二必修)。

研究強作用的基本理論 --- 量子色動力學( QCD ) --- 及其在核子 , 粒子 , 與天文物理之應用。特別是利用有效場論 (Effective Field Theory) 探討以下系統中 QCD 之必然結果:

(1)‧ 部分子(夸克與膠子)物理

(2)‧ 晶格點 QCD

(3)‧ 少體物理

(4)‧ 低密度核物質

其中第 4) 項研究在冷捕獲原子系統有直接之應用。

Chen, Jiunn-Wei
Professor

Ph.D., University of Washington (1999)

Current Research Interests:

Nuclear and Particle Physics






Selected Publications:

(1)‧ J.W. Chen, D. Lee, T. Schaefer, Inequalities for Light Nuclei in the Wigner Symmetry Limit, Phys. Rev. Lett. 93, 242302 , (2004) .

(2)‧ J.W. Chen and I.W. Stewart, Model Independent Results for SU(3) Violation in Light-Cone Distribution Functions, Phys. Rev. Lett. 92, 202001 , (2004).

(3)‧ J.W. Chen and D.B. Kaplan, 2003 , A lattice theory for low energy fermions at finite chemical potential, Phys. Rev. Lett. 92, 257002 , (2003).

(4)‧ J.W. Chen and X. Ji, Leading Chiral Contributions to the Spin Structure of the Proton, Phys. Rev. Lett. 88, 052003 (2002).

(5)‧ J.W. Chen and X. Ji, Constructing Parton Convolution in Effective Field Theory, Phys. Rev. Lett. 87, 152002 (2001).

(6)‧ J.W. Chen and X. Ji, Measuring the P-odd Pion-Nucleon Coupling h_pi in pi^+ Photoproton Production Near the Threshold, Phys. Rev. Lett. 86, 4239 (2001).

(7)‧ M. Butler, J.W. Chen and X. Kong, Neutrino-Deuteron Scattering in Effective Field Theory at Next-to-Next-to Leading Order, Phys. Rev. C63, 035501 (2001)

(8)‧ J.W. Chen, M.A. Luty, E. Ponton, A Critical Cosmological Constant from Millimeter Extra Dimensions, JHEP 0009, 012 (2000)

(9)‧ J.W. Chen, G. Rupak and M.J. Savage, Nucleon-Nucleon Effective Field Theory Without Pions, Nucl. Phys. A653, 386 (1999).

前物理組主持人(Past Division PI)(2010.11.19~2013.12.31)



賀 培 銘

教 授
1996 年加州大學柏克萊分校博士
個人網址: http://homepage.ntu.edu.tw/~pmho/home-page.html
電話:(02)3366-5192
Email:pmho@phys.ntu.edu.tw
教學和研究領域

弦論: 超弦理論(Superstring Theory)是唯一已知可能可以描述量子重力效應及其他已知物理現象的基本理論。
Ho, Pei-Ming
Professor

Ph.D., U.C. Berkeley (1996)

Current Research Interests:

String Theory.






Selected Publications:

(1) P. M. Ho, Y. Imamura, Y. Matsuo, M2 to D2 revisited, JHEP 0807:003, 2008 [arXiv: 0805.1202].
(2) C. M. Chen, P. M. Ho, I. S. Neupane, N. Ohta, J. E. Wang, Hyperbolic space cosmologies, JHEP 0310: 058, 2003 [hep-th/0306291].
(3) R. Brandenberger, P. M. Ho, Noncommutative Spacetime, stringy space-time uncertainty principle, and density fluctuations, Phys. Rev. D66: 023517, 2002 [hep-th/0203119].
(4) C. S. Chu and P. M. Ho, Constrained quantization of open string in background B field and noncommutative D-brane, Nucl. Phys. B568, 447 (2000) [hep-th/9906192].
(5) C. S. Chu and P. M. Ho, Noncommutative open string and D-brane, Nucl. Phys. B550, 151 (1999) [hep-th/9812219].

前物理組主持人(Past Division PI)(2008.02~2010.11.18)



侯 維 恕

教 授
1985 年加州大學洛杉磯分校物理博士
電話:(02)3366-5096
Email:wshou@phys.ntu.edu.tw
粒子理論:費米子味道,強作用,超對稱

專注於味道與CP破壞之現象學。研究項目包括:企鵝圖與新物理效應,CP破 壞與強作用及散射之相互關聯;雜態及膠子等之效應;B介子之重子衰變;第 四代夸克之效應;超對稱與味道破壞結合在B工廠及對撞機之影響。增强理論 與實驗間之互動。之成果。
粒子實驗:Belle, CMS, 微中子天文物理

自1994起在台大建立高能實驗室,為Belle實驗建造前置量能器EFC,發揮 重要功能。推動Belle之物理分析,台大高能組自2000年以來發表論文佔Belle 1/5強,提昇了台灣的地位。1999年加入大強子對撞機之CMS實驗,台大負責 「前注」子系統之電子母板製作。推動「穿山式」微中子望遠鏡NuTel之新穎粒 子天文物理方向,藉偵測穿山而出的濤子大氣射叢所發射之契倫可夫光,有可能 偵測如活躍星系核之銀河外微中子點光源。板製作。
Hou, George Wei-Shu
Professor
Ph. D. (1985), UCLA

Current Research Interests:

Particle theory: Flavor, CP, SUSY, QCD

Focus on flavor and CP phenomenology. The effect of penguins and new physics; interplay of strong dynamics, rescattering and CP violation; exotics such as hybrids and glueball effects; B decay to baryons; 4th generation signatures; SUSY and flavor violation in B decay and collider physics. Strengthen interaction between theory and experiment.

Particle Experiment: Belle, CMS, Neutriono Astrophysics

Initiate NTUHEP and join Belle experiment in 1994. First Bhabha event (Extreme Forward Calorimeter, EFC) at KEKB in 1999. Tremendous physics output from NTUHEP since 2000. Join CMS in 1999, responsible for Preshower Mother Board electronics. Pursue novel neutrino telescope NuTel utilizing Cherenkov pulse from tau air showers in valley after a mountain, for 1016 eV neutrino extragalactic point source detection.

Selected Publications:

(1) Pathways to Rare Baryonic B decays, W.S. Hou, A. Soni, Phys. Rev. Lett. 86, 4247 (2001).
(2) Observation of Color-suppressed B0  D00, D*00, D00, and D00 Decays, K. Abe et al., (Belle Collaboration), Phys. Rev. Lett. 88, 052002 (2002).
(3) Observation of B+  pp(bar)+, B0  pp(bar)K0, B+  pp(bar)K*+, M.Z. Wang et al. (Belle Collaboration), Phys. Rev. Lett. 92, 131801 (2004).
(4) B0  KS, K*0 CP Asymmetries from Supersymmetric Right-handed Flavor Mixing: Implications for Heavy Quark Phenomenology, C.K. Chua, W.S. Hou, M. Nagashima, Phys. Rev. Lett. 92, 201803 (2004).
(5) Evidence for Direct CP Violation in B0  K±∓ Decays, Y. Chao, P. Chang et al., (Belle Collaboration), Phys. Rev. Lett. 93, 191802 (2004).
(6) PeV cosmic neutrinos from the mountains, Ping Yeh, Wei-Shu Hou et al. [NuTel Collaboration], Mod. Phys. Lett. A 19, 1117 (2004).
(7) Collider Phenomenology of Light Strange-beauty Squarks, Kingman Chung, Wei-Shu Hou, Phys. Rev. D 70, 035009 (2004).
(8) Indication for Large Rescatterings in Charmless Rare B Decays, Chun-Khiang Chua, Wei-Shu Hou, Kwei-Chou Yang, Mod. Phys. Lett. A18, 1763-1772 (2003).
(9) Phenomenological Consequences of Right-handed Down Squark Mixings, Chun-Khiang Chua, Wei-Shu Hou, Phys. Rev. Lett. 86, 2728-2731 (2001).

前物理組主持人(Past Division PI)(2005.01 ~ 2008.02)



張 慶 瑞

教 授
1988年美國加州大學聖地牙哥分校
電話:(02) 3366-5188
Email:crchang@phys.ntu.edu.tw

教學與研究領域:

二維電子氣內的自旋傳輸:

由Landauer-Keldysh方法研究二維電子系統及量子點系統的自旋傳輸。由於自旋軌道耦合在部分二維電子系統中有強大影響導致自旋量能被外來因素操控而使得自旋電子邏輯元件的設計與現有的電子元件有機會結合。
磁化的弛緩效應:

小磁性體這種雙位井的物理系統可透過古典的熱激發及量子的宏觀穿隧效應而達成平衡,其間的演化機制暨影響是研究重點。多位井與交互作用力對弛緩的貢獻也正在瞭解。
介觀尺寸磁性體的動態翻轉機制:

正在分析與瞭解單磁區在非線性區域下可能的混沌行為及其影響,並希藉以瞭解目前實驗與理論矛盾所在。目前確知在高頻驅動時,動態有與準靜態完全不同的結果。
多層膜的異向能、巨磁阻來源與應用:

瞭解自旋閥的起源及其應用,並希能掌握製造高巨磁阻、低結合場的機制。主要希望能知道介面粗糙度在異向能與巨磁阻的影響。
磁記錄原理及應用:

分析錄寫、讀取及雜訊的物理機制及最佳化的研究。目前主要著重在讀寫頻率對媒體的熱雜訊。
Chang, Ching-Ray
Professor
Ph. D. (1988), University of California San Diego

Current Research Interests:

(1) Based on the Laudauer-Keldysh nonequilibrium Green function formalism, spin transport in two dimensional electron system and quantum dots are studied. Nonequilibrium Landauer-Keldysh formalism is applied to study various spin-dependent transport properties.

(2) Spin precession for traversing electrons in a two dimensional system with both the Rashba and Dresselhaus spin-orbit couplings are intensively studied. Treating the Rashba and Dresselhaus type interactions as non-Abelian spin-orbit gauges and performing the unitary gauge transformation for the Hamiltonian, spin precession and possible spin interference are then studied.

(3) Mechanism of Exchange Bias in Spin-valve: The origins of spin valve type multilayers are studied, especially, the topological effects on the magnetic surface anisotropy and antiferromagnetic states are emphasized. Now we are concentrated on the mechanism of exchange bias. Ultimate goal is to find the easy way to build a giant magnetoresistance, low coercivity spin valve.

(4) Dynamic Reversal of Mesoscopic Magnets: To understand the inconsistent between the experimental data and reversal theory, we extend the linear theory to the nonlinear and chaotic regions. High frequency response shows that the magnetization reverses oscillatory and detailed analyses are still in progress.

(5) Magnetic Recording Theory: Physical processes of themagnetic recording and their associated noises are interested. We currently are concentrated on the thermal noise of bycrystal media.

Selected Publications:

Published more than 160 articles and some are listed below:

(1) S. H. Chen and C. R. Chang, “Non-Abelian spin-orbit gauge: Persistent spin helix and quantum square ring”, PHYSICAL REVIEW B, Vol. 77, 045324 (2008)
(2) M. H. Liu, G. Bihlmayer, S. Bluegel and C. R. Chang, “Intrinsic spin-Hall accumulation in honeycomb lattices: Band structure effects”, PHYSICAL REVIEW B, Vol. 76, 121301 (2007)
(3) S. H. Chen, M. H. Liu and C. R. Chang, “Local spin density in a two-dimensional electron gas with a hexagonal boundary”, PHYSICAL REVIEW B, Vol. 76, 075322 (2007)
(4) M. H. Liu, K. W. Chen, S. H. Chen and C. R. Chang, “Persistent spin helix in Rashba-Dresselhaus two-dimensional electron systems”, PHYSICAL REVIEW B, Vol.74, 235322 (2006)

前物理組主持人(Past Division PI)(2004.01 ~ 2004.12)



楊 信 男

兼任教授
1972年美國紐約州立大學石溪分校物理博士
電話:(02) 3366-5139
Email:snyang@phys.ntu.edu.tw

教學與研究領域:

1.中能物理:

介子-重子作用、光電致生介子反應、核現象中之介子與核成子共振態的自由度、強子的結構與模型。
2.核少體系統:

重子-重子作用及其對稱性、輕核的結構、少體系統之理論方法。
3.高能重離子碰撞:

高能重離子碰撞之相對論性化學流體模型及傳輸理論、極端情況下之強子系統的性質、夸克-膠子離子體的性質、強作用物質之統計力學。

榮譽:

1.美國物理學會會士

2.中華民國物理學會會士

Yang, Shin-Nan
Professor
Ph. D. (1972), State University of New York at Stony Brook

Interests and Activities:

Intermediate energy physics: Meson-baryon interactions, electromagnetic production of mesons, mesons and nucleon resonances in nuclei, hadron structure and models.
Nuclear few-body systems: baryon-baryon interactions and their symmetries, structure of light nuclei, theoretical methods of few-body system.
High-energy heavy-ion collision: Relativistic hydrochemical model and transport theory of high-energy heavy-ion collision, properties of hadronic system at extreme conditions and quark-gluon plasma, statistical mechanics of strongly interacting sytems.

Selected Publications:

(1) A.I. Titov, Y.S. Oh and S.N. Yang, Polarization Observables in Photoproduction of Φ Meson and the Strangeness Content of Proton, Phys. Rev. Lett. 97(1997) 1634.
(2) G.D. Yen, MI. Gorenstein, H. Stöcker, S.N. Yang, and W. Greiner, Chemical Freezeout in Relativistic A + A Collisions: Is it close to quark-gluon plasma?, J. Phys. G24,1777 (1998).
(3) S.S. Kamalov, and S.N. Yang, Pion Cloud and the Q2dependence of the γ*N Form Factors, Phys. Rev. Lett. 83, 4494(1999).
(4) D. H. Lu, S.N. Yang, and A.W. Thomas, Scaling law for the electromagnetic form factors of the proton, J. Phys. G26(2000) L75.
(5) C.T. Hung, S.N. Yang, and T.-S.H Lee, Meson-exchange πN Models in Three-dimensional Bethe-Salpeter Formulation, Phys. Rev. C64(2001) 04309.
(6) S.S. Kamlov, G.Y. Chen, S.N Yang, D Drechsel, and L. Tiator, π0 photo- and electro-production at threshold within a dynamical model, Phys. Lett. B522(2001) 27.