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1091-專題演講-1091118-江正天(中研院原分所)

演講活動
張貼人:李明芳公告日期:2020-08-18
  
Time1091118 (Wed.) 14:20~16:20
Speaker 1Prof.江正天(CHIANG, Cheng-Tien)
中央研究院原子與分子科學研究所/Institute of Atomic and Molecular Sciences, Academia Sinica
TitleTwo-electron photoelectric effect at surfaces
AbstractSince the discovery of the photoelectric effect, its relevance to the electronic structure of solid surfaces has become a long-standing research topic [1]. As a modern technique to study the general electronic structure of surfaces using the photoelectric effect, angle-resolved photoelectron spectroscopy (ARPES) has successfully revealed the characteristics of quantum materials ranging from graphene, topological insulators, to the two-dimensional semiconducting monolayers of transition metal dichalcogenides [2]. In combination with the recent progress of high-power femtosecond lasers, ultrafast electron dynamics in these materials can be studied by laser-based ARPES in order to reveal the many-body interaction between electrons [3].

 

In this talk, advanced laser-based photoelectron spectroscopy will be introduced. Moreover, a significant extension of the well-established ARPES toward the direct characterization of electron- electron interaction in solids will be presented. In this so-called double photoemission (DPE) spectroscopy, a pair of electrons is emitted from a solid surface upon the absorption of one single photon [4]. The photoelectron pairs are analyzed by a pair of time-of-flight electron spectrometers in combination with coincidence electronics [5]. As examples, the two-dimensional DPE spectra of Ag(001) and NiO(001) surfaces will be discussed in terms of the specific electron-electron interaction in these materials [6].

 

[1] H. Hertz, Ann. Phys. 267, 983 (1887); P. Lenard, Ann. Phys. 307, 359 (1900); A. Einstein, Ann. Phys. 22,132(1905); R. A. Millikan, Phys. Rev. 7, 355 (1916).

[2] D. Hsieh et al., Nature 460, 1101 (2009); A. Bostwick et al., Nat. Phys. 3, 36 (2007); W. Jin et al., Phys. Rev. Lett. 111, 106801 (2013).

[3] P. M. Echenique et al., Surf. Sci. Rep. 52, 219 (2004).

[4] C. Gazier and J. R. Prescott, Phys. Lett. 32A, 425 (1970); J. Berakdar, Phys. Rev. 58, 9808 (1998); F. O. Schumann et al., Phys. Rev. Lett. 98, 257604 (2007).

[5] M. Huth et al., Appl. Phys. Lett. 104, 061602 (2014).

[6] C.-T. Chiang et al., Prog. Surf. Sci. 95, 100572 (2020); A. Trützschler, M. Huth, and C.-T. Chiang et al., Phys. Rev. Lett. 118, 136401 (2017).
PlaceB101, Gongquan Campuses, NTNU

最後修改時間:2020-11-13 PM 2:43

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單位簡介

本系的重點研究領域包括:凝態物理、光電與奈米科學、高能與粒子物理、軟凝態物理與生物物理、原分子光學物理、及物理科學教育等。本系前身為臺灣省立師範學院理化系物理組,成立於民國三十五年(1946年)本校創校之始。民國五十一年(1962年)本系獨立成系,民國六十三年(1974年)成立物理研究所碩士班,民國八十年(1991年)成立研究所博士班。長久以來,本系肩負著培育臺灣中等學校物理科師資的重任,但也不忘在物理學術研究上求新求進步。至今本系培育出的學術人才已有一位中研院院士及近百位中研院研究員及大學教授,各行各業的高科技人材更是不勝枚舉。民國八十三年師資培育法改制後,本系已升級為尖端學術研究、科技應用研發、及中學師資培育三者齊備的系所。

  • 國立臺灣師範大學物理系系友會
  • 系友會線上小額捐款
  • 徐有庠盃-臺灣青年學生物理辯論競賽
  • 國際物理奧林匹亞競賽
  • 公用場地與儀器設施預約系統
  • 學生實習專區
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