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學歷 |
- 美國田納西大學納克斯維爾校區博士(2002年)
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現職與經歷 |
現職：國立清華大學物理系助理教授(2006/08-)
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研究領域 |
- 實驗表面物理
- 光電子能譜
- 低能量電子顯微鏡
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研究興趣與成果 |
Updated on September 3, 2006
我在博士階段時，有對幾個不同的金屬表面及薄膜系統做過研究。其中，我最致力的是對Be 表面電子與聲子偶合的研究，鈹(Beryllium)是一個非常有趣的金屬，因為它是一個半金屬且在整個brillouin zone裏有一個很大的energy gap，然而其晶體表面卻展現自由電子的性質，並存在著非常局部的表面電子態，這些局部的表面電子態的行為跟在鈹晶體面的電子態完全不一樣。在鈹的表面，電子和聲子偶合的力量是在晶體裏面偶合力量的三倍。從表面態的光電子能譜，我成功的經由自我能量的虛部對溫度的變化及自我能量實部對能量的變化來取得與表面電子態偶合最主要的聲子態密度結構。我現在進一步想走的方向為研究表面電子態與晶體表面的晶格行為(如表面舒張及表面熱量伸縮)互相間之關係。
在我做博士後研究時，我主要是研究在半導體基底上金屬薄膜(如Ag/Ge(111))的量子井態。薄膜一直是很廣泛地應用在元件設計上。例如，如果薄膜是磁性材料所做成，量子井態就很密切地與磁性薄膜的重要性質，如：oscillatory magnetic coopling及Giant Magnetoresistare(GMR)相關連。而這兩種重要的磁性性質都已應用在硬碟的資料儲存元件上。我在Ag/Ge(111)系統上的研究有兩個重要的發現。
一、在某種特定蒸鍍及加熱條件下，有原子精確度的二維平整Ag薄膜可長在Ge(111)的基底上。
二、基底可強烈的改變薄膜的電子結構。
這兩種發現當然是非常重要，且有可能導致一些特定在應用上重要的薄膜性質大輻提昇。我主要使用的實驗技術為光電子能譜。它是用來偵測電子能帶結構及行為的最好工具。我目前和台灣同步輻射中心(NSRRC)合作來從事光電子能譜的實驗。在未來我還計劃使用低能量電子顯微鏡(LEEM)來研究表面的地形演變及薄膜的生長。
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代表著作 |
- [2006]Electronic Fringe Structure in Silver Films on Highly Doped Silicon, N. J. Speer, S. -J. Tang, T. Miller, and T.-C. Chiang, Science 314, 804 (2006).
- [2006]Umklapp-mediated Quantization of Electronic States in Ag Films on Ge(111), S. -J. Tang, Y. R. Lee, S. -L. Chang, T. Miller, and T. -C. Chiang,
Phys. Rev. Lett. 96, 216803 (2006).
- [2006]Sublimation of Atomic Layers from a Chromium Surface, S. -J. Tang, S. Kodambaka, W. Swiech, I. Petrov, T. -C. Chiang,
Phys. Rev. Lett. 96, 126106 (2006).
- [2006]Modification of Surface States in Ultrathin Films via Hybridization with the Substrate – a Study of Ag on Ge, S. -J. Tang, T. Miller, and T.-C. Chiang,
Phys. Rev. Lett. 96, 036802 (2006).
- [2004]Breakup of Quasiparticles in Thin-Film Quantum Wells, S. -J. Tang, L. Basile, T. Miller, and T.-C. Chiang,
Phys. Rev. Lett. 93, 216804 (2004)
- [2004]Direct extraction of the Eliashberg function for electron-phonon coupling: A case study of Be . Junren Shih, S.-J. Tang, B. Wu, et al,
Phys. Rev. Lett. 92, 186401 (2004).
- [2004]A spectroscopic view of electron phonon coupling at metal surfaces, S. -J. Tang, Junren Shih, B. Wu, et al,
Physica Status Solidi (b), 241, 2345 (2004).
- [2002]The electron phonon coupling and the temperature dependent initial energy shifts of the surface states on Be , S. -J. Tang, Ismail, P. T. Sprunger, E. W. Plummer,
Phys. Rev. B 65, 235428 (2002).
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- 全部著作
(Click 展開/隱藏)
A.Representative publications:
- Surface state influence on the surface lattice structure: a case study for Be , S. -J. Tang, H.-T. Jeng, Chen-Shiung Hsue, Ismail, P.T. Sprunger, and E. W. Plummer, Phys. Rev. B, in press (2007).
- Electronic Fringe Structure in Silver Films on Highly Doped Silicon, N. J. Speer,S. -J. Tang, T. Miller, and T.-C. Chiang, Science 314, 804 (2006).
- Umklapp-mediated Quantization of Electronic States in Ag Films on Ge(111), S. -J. Tang, Y. R. Lee, S. -L. Chang, T. Miller, and T. -C. Chiang, Phys. Rev. Lett. 96, 216803 (2006). Selected for the Virtual Journal of Nanoscale Science & Technology 13 (23) 2006. Sublimation of Atomic Layers from a Chromium Surface, S. -J. Tang, S. Kodambaka, W. Swiech, I. Petrov, T. -C. Chiang, Phys. Rev. Lett. 96, 126106 (2006)
- Modification of Surface States in Ultrathin Films via Hybridization with the Substrate – a Study of Ag on Ge, S. -J. Tang, T. Miller, and T.-C. Chiang, Phys. Rev. Lett. 96, 036802 (2006). Selected for the Virtual Journal of Nanoscale Science & Technology 13 (5) 2006
- Breakup of Quasiparticles in Thin-Film Quantum Wells, S. -J. Tang, L. Basile, T. Miller, and T.-C. Chiang, Phys. Rev. Lett. 93, 216804 (2004). Selected for the Virtual Journal of Nanoscale Science & Technology 10 (22) 2004
- A spectroscopic view of electron phonon coupling at metal surfaces, S. -J. Tang, Junren Shih, B. Wu, et al, Physica Status Solidi (b), 241, 2345 (2004).
- Direct extraction of the Eliashberg function for electron-phonon coupling: A case study of Be . Junren Shih, S.-J. Tang, B. Wu, et al, Phys. Rev. Lett. 92, 186401 (2004) (24 citations according to ISI web knowledge)
- The electron phonon coupling and the temperature dependent initial energy shifts of the surface states on Be , S. -J. Tang, Ismail, P. T. Sprunger, and E. W. Plummer, Phys. Rev. B 65, 235428 (2002) (21 citations according to ISI web knowledge)
B.All publications:
- S. -J. Tang, H.-T. Jeng, C.S. Hsue, Ismail, P.T. Sprunger, and E. W. Plummer, "Surface state influence on the surface lattice structure: a case study for Be ", Phys. Rev. B, in press (2007).
- Electronic Fringe Structure in Silver Films on Highly Doped Silicon, N. J. Speer,S. -J. Tang, T. Miller, and T.-C. Chiang, Science 314, 804 (2006)
- Umklapp-mediated Quantization of Electronic States in Ag Films on Ge(111), S. -J. Tang, Y. R. Lee, S. -L. Chang, T. Miller, and T. -C. Chiang, Phys. Rev. Lett. 96, 216803 (2006). Selected for the Virtual Journal of Nanoscale Science & Technology 13 (23) 2006
- Sublimation of Atomic Layers from a Chromium Surface, S. -J. Tang, S. Kodambaka, W. Swiech, I. Petrov, T. -C. Chiang, Phys. Rev. Lett. 96, 126106 (2006)
- Modification of Surface States in Ultrathin Films via Hybridization with the Substrate – a Study of Ag on Ge, S. -J. Tang, T. Miller, and T.-C. Chiang, Phys. Rev. Lett. 96, 036802 (2006). Selected for the Virtual Journal of Nanoscale Science & Technology 13 (5) 2006
- Breakup of Quasiparticles in Thin-Film Quantum Wells, S. -J. Tang, L. Basile, T. Miller, and T.-C. Chiang, Phys. Rev. Lett. 93, 216804 (2004). Selected for the Virtual Journal of Nanoscale Science & Technology 10 (22) 2004
- A spectroscopic view of electron phonon coupling at metal surfaces, S. -J. Tang, Junren Shih, B. Wu, et al, Physica Status Solidi (b), 241, 2345 (2004).
- Direct extraction of the Eliashberg function for electron-phonon coupling: A case study of Be . Junren Shih, S.-J. Tang, B. Wu, et al, Phys. Rev. Lett. 92, 186401 (2004) (24 citations according to ISI web knowledge)
- Enhanced electron-phonon coupling at metal surfaces. E.W. Plummer, Junren Shih, S. -J. Tang, et al. Progress in Surface Science, 74, 251-268, (2003)
- The investigation of the growth and thin film morphological structure of Be on Si(111)-(7 x 7) by STM and UPS. D. A. Hite, S.-J. Tang, P. T. Sprunger, Chemical physics letters, 367, (2003), 129-135
- The electron phonon coupling and the temperature dependent initial energy shifts of the surface states on Be , S. -J. Tang, Ismail, P. T. Sprunger, E. W. Plummer, Phys. Rev. B 65, 235428 (2002) (21 citations according to ISI web knowledge)
- Electronic structure of a surface quantum-wire array, K. Yoo, S. J. Tang, P. T Sprunger, I. Benito, J. Ortega, F. Flores, P.C. Snijders, M.C. Demeter, H.H. Weitering, Surf. Sci. 514, (2002), 100-107
- Photoemission band symmetries and dipole active modes of crystalline film of vinyidene fluoride(70%) with trifluoroethylene(30%) across the ferroelectric transitions, Jaewu Choi, S. -J. Tang, P.T Sprunger, P.A Dowben , J. Phys. Condens. Matter 12, (2000), 4735
- Electronic Structure and Molecular Orientation of Well-ordered Polyethylene Oligomer (n-C44H90) on Cu(100) and Au(111) Surfaces Studied by UV Photoemission and Low Energy Electron Diffraction, H. Ishii, E. Morikawa, S. J. Tang, et al, Journal of Electron Spectroscopy and related Phenomena, 101-103, (1999), 559-564
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