莊天明 / 助研究員

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連絡資訊

學歷

  • 德州大學奧斯汀分校物理博士, 2006
  • 成功大學物理系學士, 1999

秘書

周泳恩 / 886-2-2789-8364

研究興趣

新穎材料電子與磁性結構 ; 高溫超導材料 ; 強作用電子系統 ; 掃描探針式顯微術 ;

經歷

  • 訪問學者, 美國康乃爾大學物理系, 2011-2012
  • 博士後研究員,美國超高磁場國家實驗室, 2007-2010
  • 博士後研究員, 美國康乃爾大學物理系, 2007-2011

學術著作

期刊論文

  • [1]     Chih-Chuan Su, Chi-Sheng Li, Tzu-Cheng Wang, Syu-You Guan, Raman Sankar, Fangcheng Chou, Chia-Seng Chang, Wei-Li Lee*, Guang-Yu Guo* and (Tien-Ming Chuang)*, 2018, “Surface termination dependent quasiparticle scattering interference and magneto-transport study on ZrSiS”, NEW JOURNAL OF PHYSICS, 20, 103025. (SCI) (IF: 3.786; SCI ranking: 12.7%)

  • [2]     Guan Syu-You, Liao Hsien-Shun, Juang Bo-Jing, Chin Shu-Cheng, (Chuang Tien-Ming*), Chang Chia-Seng, 2018, “The design and the performance of an ultrahigh vacuum 3He fridge-based scanning tunneling microscope with a double deck sample stage for in-situ tip treatment”, Ultramicroscopy, 196 180-185. (SCI) (IF: 2.843; SCI ranking: 10%)

  • [3]     Guan S.-Y., Chen P.-J., Chu M.-W., Sankar R., Chou F., Jeng H.-T., Chang C.-S., (Chuang T.-M.*), 2016, “Superconducting topological surface states in the noncentrosymmetric bulk superconductor PbTaSe2”, Science Advances, 2(11) e1600894-e1600894.

  • [4]     M. P. Allan, Kyungmin Lee, A. W. Rost, M. H. Fischer, F. Massee, K. Kihou, C-H. Lee, A. Iyo, H. Eisaki, (T-M. Chuang), J. C. Davis and Eun-Ah Kim, 2015, “Identifying the ‘fingerprint’ of antiferromagnetic spin fluctuations in iron pnictide superconductors”, NATURE PHYSICS, 11, 177. (SCI) (IF: 22.806; SCI ranking: 2.5%)

  • [5]     M. P. Allan, (T-M. Chuang), F. Massee, Yang Xie, Ni Ni, S. L. Bud'ko, G. S. Boebinger, Q. Wang, D. S. Dessau, P. C. Canfield, M. S. Golden & J. C. Davis*, 2013, “Anisotropic impurity states, quasiparticle scattering and nematic transport in underdoped Ca(Fe_{1-x}Co_{x})_{2}As_{2}”, Nature Physics, 9,220-224. (SCI) (IF: 22.806; SCI ranking: 2.5%)

  • [6]     M. P. Allan, A. W. Rost, A. P. Mackenzie, Yang Xie, J. C. Davis*, K. Kihou, C. H. Lee, A. Iyo, H. Eisak and (T.-M. Chuang)*, 2012, “Anisotropic Energy Gaps of Iron-Based Superconductivity from Intraband Quasiparticle Interference in LiFeAs”, SCIENCE, 336, 563-567. (SCI) (IF: 37.205; SCI ranking: 3.1%)

  • [7]     H. Berger, D. Ariosa, R. Gáal, A. Saleh, G. Margaritondo, S. F. Lee, S. H. Huang, H. W. Chang, (T. M. Chuang), Y. Liou, Y. D. Yao, Y. Hwu, J. H. Je, L. V. Gasparov, D. B. Tanner, 2002, “Coexistence of ferromagnetism and high-temperature superconductivity in Dy-doped BiPbSrCaCuO”, SURFACE REVIEW AND LETTERS, 9, 1109. (SCI) (IF: 0.491; SCI ranking: 94%,96.6%)

  • [8]     (T. M. Chuang), S. F. Lee, S. Y. Huang, Y. D. Yao, W. C. Cheng and G. R. Huang, 2002, “Anomalous Magnetic Moments in Co/Nb multilayers”, JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 239,301. (SCI) (IF: 2.63; SCI ranking: 35.8%,30.5%)

  • [9]     S. F. Lee, (T. M. Chuang), S. Y. Huang, W. L. Chang, and Y. D. Yao, 2001, “Two-dimensional to Three-dimensional Crossover and Magnetic Penetration Depth Study in NbTi/Co Multilayers”, JOURNAL OF APPLIED PHYSICS, 89, 7493. (SCI) (IF: 2.068; SCI ranking: 39.9%)

獎項及殊榮

(1) 2017 科技部吳大猷先生紀念獎
(2) 國內學術研究獎項 2012 建大文教基金會傑出年輕金玉學者獎

發現與突破

(1) 西元年:2016
研究人員(中):莊天明、關旭佑、陳鵬仁、朱明文、雷曼、周方正、鄭弘泰、張嘉升
研究人員(英):TIEN-MING, CHUANG, Syu-You Guan,Peng-Jen Chen,Ming-Wen Chu,Raman Sankar,Fangcheng Chou,Horng-Tay Jeng, Chia-Seng Chang
研究成果名稱(中):發現非中心對稱PbTaSe2單晶中之超導拓樸態
研究成果名稱(英):Discovery of superconducting topological surface states in PbTaSe2
簡要記述(中):當拓樸絕緣體結合超導體時,理論上可形成拓樸超導體。在拓樸超導體中,尚未確認的費米子-馬約拉那費米子,會被束縛在如超導渦流的拓樸缺陷,這樣的組合被預測會表現出非阿貝爾統計,可成為量子計算的基礎。在拓樸絕緣體中引入超導的最簡單方法是將其摻雜出超導性或於其上覆蓋s-波超導體。然而摻雜難以製造出均勻有序的材料,在多層結構中製造出乾淨的界面也相當困難。

解決之道是尋找適合的符合化學配比超導體,費米面上展現出拓樸表面態,並在超導態時,具有完整超導能隙。到目前為止,尚未有這種物質被發現。由本院物理所陳鵬仁博士和清大鄭弘泰教授透過密度泛函計算研究PbTaSe2的電子結構,發現其能滿足成為拓樸超導體的條件。材料由台大凝態中心Raman Sankar博士和研究員周方正成功合成出高品質單晶樣品,並由該中心研究員朱明文使用掃描穿透式電子顯微鏡確認晶體結構。表面與電子結構則由台大物理所博士生關旭佑、本院物理所張嘉升博士和莊天明博士使用掃描穿隧電子顯微鏡觀察原子尺度下電子波函數變化,確認了理論預測中拓樸能帶的能譜特徵和超導特性。此成果為在符合化學配比的塊材中,首次發現到具有完整超導能隙的拓樸表面態。此成果展示PbTaSe2是一個值得重視的拓樸超導體候選材料。
簡要記述(英):The search of novel states of matter has always been of fundamental and technical importance. For example, the study of spin order in magnetic materials has led to the giant magnetoresistance (Nobel Prize in 2007) and the miniaturization of hard drives. The discovery of the quantum Hall effect in 1980 (Nobel Prize in 1985) and the subsequent development of topological band theory (Nobel Prize this year) have open a new field to the study of topological phases. The key development is the theoretical prediction and the experimental confirmation of topological insulators (TIs). A TI, like an ordinary insulator, has a bulk energy gap separating the highest valence band from the lowest conduction band. However, at the boundary, a TI has protected conducting states that are immune to impurities and useful for high performance electronics.
When a TI combined with superconductivity, it can theoretically lead to another important class of materials: topological superconductors (TSCs). TSCs are characterized by a full superconducting gap in the bulk and topologically protected gapless surface states. In a TSC, Majorana fermion, a hypothetical particle is its own anti-particle, is bound to a topological defect such as a superconducting vortex. Such combined objects are predicted to exhibit non-Abelian statistics and to form the basis of the fault-tolerant quantum computation. The simplest way to introduce superconductivity in a TI is by making it superconducting by doping or by coating a layer of s-wave superconductor. However, both approaches are technically challenging because it is difficult to make a homogenous doped material or a heterostructure with a clean interface.
The solution is to find a stoichiometric material that exhibits topological surface states at Fermi level in the normal state combined with fully gapped bulk superconductivity below TC. So far, no such a bulk material is reported. Dr. Peng-Jen Chen from AS and Prof. Horng-Tay Jeng from NTHU found such requirements for a TSC are satisfied in a layered material, PbTaSe2 when studying its electronic structures by density functional theory. High quality single crystals are then synthesized by Dr. Raman Sankar and Dr. Fangcheng Chou at Center for Condensed Matter Sciences, NTU and the detailed crystal structure is confirmed by Dr. Ming-Wen Chu by using scanning transmission electron microscopy. By visualizing the electron wavefunction at atomic scale with the state-of-the-art home-built scanning tunneling microscopes, PhD student Syu-You Guan from NTU, Dr. Chia-Seng Chang and Dr. Tien-Ming Chuang from AS confirm the spectroscopic signature of the calculated topological band structures and superconducting properties in PbTaSe2. The fully gapped superconducting topological surface state is reported for the first time in a stoichiometric bulk material. Their work shows PbTaSe2 is a promising TSC candidate.
This research was supported by Academia Sinica, Ministry of Science and Technology, and National Taiwan University. Dr. Tien-Ming Chuang also received the support from Kenda Foundation.
主要相關著作:
Guan S.-Y., Chen P.-J., Chu M.-W., Sankar R., Chou F., Jeng H.-T., Chang C.-S., (Chuang T.-M.*), 2016, “Superconducting topological surface states in the noncentrosymmetric bulk superconductor PbTaSe2”, Science Advances, 2(11) e1600894-e1600894.
(2) 西元年:2013
研究人員(中):莊天明
研究人員(英):TIEN-MING, CHUANG
研究成果名稱(中):鐵基超導體中異向性雜質態, 準粒子干涉與向列型電子傳輸之關聯性
研究成果名稱(英):Anisotropic impurity states, quasiparticle scattering and nematic transport in underdoped Ca(Fe_{1-x}Co_{x})_{2}As_{2}
簡要記述(中):鐵基超導體的超導現象可由對其反鐵磁/正交晶母相摻入雜質所產生. 這些雜質在原子尺度下對電子結構的影響雖然已有許多不同理論, 然而實驗上的觀察卻闕之付如. 巨觀上我們目前知道在母相中電子傳輸有很強的異向性, 在b軸方向電阻較高, 並隨著雜質濃度而改變, 母相在超導溫度最高的雜質濃度會被完全破壞後, 這個’向列型’電子結構也隨之消失. 藉由掃描式穿隧電流顯微鏡, 我們可以直接觀察到當鈷原子取代鐵原子時, 母相的電子結構產生許多相同的異向性雜質態. 每個異向性雜質態具有約8倍鐵原子的晶格間距, 在空間中沿著a軸方向排列, 隨機分布. 我們也展示這些異向性雜質態可以散射電子造成傳輸實驗中所觀察到的’向列型’ 電子結構. 我們的結果顯示雜質對鐵基超導體的母相有顯著的影響.
簡要記述(英):Iron-based high-temperature superconductivity develops when the ‘parent’ antiferromagnetic/orthorhombic phase is suppressed, typically by introduction of dopant atoms. But their impact on atomic-scale electronic structure, although in theory rather complex, is unknown experimentally. What is known is that a strong transport anisotropy with its resistivity maximum along the crystal b axis, develops with increasing concentration of dopant atoms; this ‘nematicity’ vanishes when the parent phase disappears near the maximum superconducting Tc. The interplay between the electronic structure surrounding each dopant atom, quasiparticle scattering therefrom and the transport nematicity has therefore become a pivotal focus of research into these materials. Here, by directly visualizing the atomic-scale electronic structure, we show that substituting Co for Fe atoms in underdoped Ca(Fe_{1-x}Co_{x})_{2}As_{2} generates a dense population of identical anisotropic impurity states. Each is ~8 Fe–Fe unit cells in length, and all are distributed randomly but aligned with the antiferromagnetic a axis. By imaging their surrounding interference patterns, we further demonstrate that these impurity states scatter quasiparticles in a highly anisotropic manner, with the maximum scattering rate concentrated along the b axis. These data provide direct support for the recent proposals that it is primarily anisotropic scattering by dopant-induced impurity states that generates the transport nematicity; they also yield simple explanations for the enhancement of the nematicity proportional to the dopant density and for the occurrence of the highest resistivity along the b axis.
主要相關著作:
M. P. Allan, (T-M. Chuang), F. Massee, Yang Xie, Ni Ni, S. L. Bud'ko, G. S. Boebinger, Q. Wang, D. S. Dessau, P. C. Canfield, M. S. Golden & J. C. Davis*, 2013, “Anisotropic impurity states, quasiparticle scattering and nematic transport in underdoped Ca(Fe_{1-x}Co_{x})_{2}As_{2}”, Nature Physics, 9,220-224. (SCI) (IF: 22.806; SCI ranking: 2.5%)
(3) 西元年:2012
研究人員(中):莊天明
研究人員(英):TIEN-MING, CHUANG, M. P. Allan, A. W. Rost, A. P. Mackenzie, Yang Xie, J. C. Davis, K. Kihou, C. H. Lee, A. Iyo, H. Eisaki
研究成果名稱(中):鐵基高溫超導體之超導能隙異向性研究
研究成果名稱(英):Anisotropic Energy Gaps of Iron-based Superconductivity from Intraband Quasiparticle Interference in LiFeAs
簡要記述(中):超導體中,電子會形成庫柏電子對,在晶格中移動時不會產生電阻。來自台、日、英、美的研究團隊,藉由量測鐵基超導體中庫柏電子對的內部電子聯結強度,證實磁 性對高溫超導具有關鍵性的影響。實驗也檢驗此強度與電子移動方向的關聯性,進一步驗證了理論的預測。我們希望未來這類理論可用在檢視及設計更高溫的超導 體。此研究成果發表在「科學」期刊(Science 336, 563 (2012))。

高溫超導成因已困惑了科學家近三十年。許多人相信藉磁性媒介的電子間交互作用是關鍵。於2008年發現的鐵基超導體 為這個想法提供了另一個有力證據,因為它們的母系化合物像銅基高溫超導體有類似反鐵磁性。但決定磁性在鐵基超導的角色是個複雜問題,因為每個鐵原子有五個電子貢獻磁性。為查明是否電子間磁 交互作用產生超導,必須量測超導能隙異向性。此物理量可顯示庫柏電子對在動量空間中不同方向的鍵結強度。

理論學家們針對以磁性為主的電子配對機制發展出不同的高溫超導理論,並預測符合這些理論的實驗結果將會是如何。研究團隊發現實驗結果吻合理論預測的特徵。本文共同通訊作者院莊天明博士指出「儘管理論學家預測超導能隙異向性的存在,但由於複雜 的電子結構,計算這效應的大小仍是非常的困難。我們的量測結果不僅在定性上與理論預測吻合,並且提供理論學家關鍵資訊以發展定量的高溫超導理論。」

簡要記述(英):In superconductors, electrons form Cooper pairs and move through the crystal lattice without resistance. By measuring how strongly Cooper pairs are bound together in an iron-based superconductor, scientists from Academia Sinica, the University of St Andrews, Cornell University, the U.S. Department of Energy’s Brookhaven National Laboratory and AIST, Japan, provide direct evidence supporting theories in which magnetism holds the key to this material’s ability to carry current with no resistance. The measurements take into account the directions in which the electrons are traveling, which was central to testing the theoretical predictions, thereby strengthening confidence that this type of theory may one day be used to identify or design new materials with improved properties - namely, superconductors operating at room temperatures. The findings are published in Science 336, 563 on May 4, 2012.

High-temperature superconductors have been fascinating to both scientists and engineers since they could carry current with no loss at temperatures as high as 155 K. The hope is that understanding the physics of these compounds will lead to the design of superconductors able to operate at room temperatures, which can be used for energy-saving technologies, such as zero-lose power transmission lines. However, the physics of high temperature superconductivity has confounded scientists over the last 30 years. It is generally believed that the magnetically mediated electron-electron interaction of these materials is the key. When iron-based superconductors were discovered in 2008, this idea received a big boost because their parent compounds exhibit similar magnetic properties as their copper-based counterparts. However, determining that role is a very complex problem. In each iron atom there are five magnetic electrons. In order to find out if the magnetic interactions between electrons are generating the superconductivity, one has to measure what’s called the anisotropic superconducting energy gap, which can tell scientists the bounding strength of Cooper pairs along different directions in momentum space.

Their method, multi-band Bogoliubov quasiparticle scattering interference, found the “signature” predicted by magnetism-based pairing theory. "Although theorists predicted the existence of superconducting gap anisotropy, it’s difficult to calculate how large this effect is. Our measurements not only agree with the theoretical prediction but also provide theorists with crucial information towards a more quantified description." said Dr. Tien-Ming Chuang of Academia Sinica. The next step is to use the same technique to determine whether the theory holds true for other iron superconductors.

主要相關著作:
M. P. Allan, A. W. Rost, A. P. Mackenzie, Yang Xie, J. C. Davis*, K. Kihou, C. H. Lee, A. Iyo, H. Eisak and (T.-M. Chuang)*, 2012, “Anisotropic Energy Gaps of Iron-Based Superconductivity from Intraband Quasiparticle Interference in LiFeAs”, SCIENCE, 336, 563-567. (SCI) (IF: 37.205; SCI ranking: 3.1%)
個人資料維護 | 著作目錄維護同步更新 | 最後更新日期 : 2018-11-11
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