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新研究成果發表於奈米通訊期刊(Nano Letters)
新研究成果發表於奈米通訊期刊(Nano Letters)
沙漏費米子為一新型費米子電子態，在2016年與2018年被預測可能出現在兩類材料中，該電子態除了有特別的沙漏狀能帶結構，也有特殊得三維推廣之量子霍爾自旋效應。本研究利用同步輻射之VUV光角解析光電子能譜、穿隧式電子顯微鏡、X光繞射等技術，分析層狀半金屬Nb3SiTe6材料中的沙漏費米子電子態。除了量測到沙漏費米子一部分的狄拉克節點線之外，我們也量測到自旋電子流的電子能帶結構。本論文提供許多直觀證據，有助於進一步了解沙漏費米子的物理特性。此研究成果發表在美國化學學會出版的《奈米通訊》 （Nano Letters）並獲選為當期期刊內頁封面。
期刊連結:
Dirac Nodal Line in Hourglass Semimetal Nb3SiTe6 | Nano Letters (acs.org)
新聞連結:
https://www.nsrrc.org.tw/ViewNews/MediaLayout02.aspx?ViewID=M20230313015138031&Lang=Chinese
科學推展中心報導:
Assistant Researcher at
National Synchrotron Radiation Research Center
Assistant Researcher at
National Synchrotron Radiation Research Center
TPS39A2 NanoARPES station construction
liu.roya@nsrrc.org.tw
2020.6-now
CV.pdf
Dr. Ro-Ya Liu (劉若亞)
Dr. Ro-Ya Liu (劉若亞)
About
About
Keywords of competencies:
1. Materials Characterization: Surface, Interface, Thin Film, Solid State Crystals Characterization, Electronic Structure Analysis
2. Experimental Techniques: Ultra-high Vacuum (UHV), XRD/LEED/RHEED/Molecular Beam Epitaxy system, XPS, micron/nano-ARPES, Time-resolved ARPES (TRARPES), Synchrotron Radiation Light Source
3. Materials : Semiconductors: (doped-Si(111), Ge(001), 6H-SiC, Graphite, h-BN)
Oxides: doped-SrTiO3, rutile-TiO2
Transition Metal Dichalcogenides (MoS2, WSe2, VSe2, ZrTe5, Nb3SiTe6, CrGeTe226…etc),
2-D films: Graphene, Borophene
Atomic metal Thin Films: Au, Ag, Pb
4. Research Expertise: Surface Science, Electronic Valence Band Structure, Valleytronics, and Carrier Dynamics at semiconductor surfaces, Dirac fermion/hourglass fermion/topological state/quantum well state
5. Professional skills: User support, Cross-functional Collaboration, International Collaboration, Scientific Writing, Technical Presentation
Experienced physicist specializing in synchrotron radiation and advanced photoemission spectroscopy for electronic materials research. Participated in the construction and commissioning of the Nano-resolved and Angle-resolved Photoemission Spectroscopy (NanoARPES) endstation at Taiwan Photon Source Beamline 39A2. Extensive experience in ultra-high vacuum (UHV) systems, surface preparation, electronic structure characterization, and data analysis using XPS, ARPES, TRARPES, and micro-/nano-XPS. Conducted research on semiconductors, quantum materials, oxide materials, and thin films, while collaborating with international research teams on scientific publications, conference presentations, and user support. Interested in applying advanced materials characterization and problem-solving skills to semiconductor process and materials development.
Experience
Experience
Postdoc. Fellow (2018-2020)
Collaborative Postdoc. Researcher at Advanced Light Source, Lawrence Berkeley National Lab, Berkeley, CA, USA (Host: Dr. Alexei Fedorov)
Visiting Scholar at Tai-Chang Chiang's lab, University of Illinois at Urbana-Champaign, IL, USA (Advisor: Prof. Tai-Chang Chiang)
Postdoc. Researcher at Institute of Physics, Academia Sinica, Taiwan (Host: Prof. Chia-Seng Chang)
Education
Education
2026 美甲零基礎入門班 (師承 羊蹄甲老師)
2025 中外補習班中餐丙級證照班結業 (師承 陳世文老師)
PhD in Experimental Physics, Institute for Solid State Physics, University of Tokyo, Japan (2017)
Thesis: Carrier dynamics at surfaces of WSe2 studied by time-resolved photoemission spectroscopy (時間分解光電子分光による WSe2表面 のキャリアダイナミクス研究) Advisor: Prof. Iwao Matsuda
MS in Synchrotron Radiation and Technology, School of Science, National Tsing-Hua University, Taiwan (2013)
Thesis: Studies of work function, electron-phonon coupling constant, and superconductivity transition temperature of Pb thin films on Ge(111) (鉛薄膜在鍺(111)基底上的功函數,電子聲子耦合參數,及超導溫度的量測) Advisor: Prof. Shu-Jung Tang
BS in Physics, Dept. of Physics, National Tsing-Hua University, Taiwan (2011)
Grant and Fellowship
Grant and Fellowship
MOST “以角解析光電子能譜探索並操控拓樸半金屬之電子能帶結構” under grant number MOST111-2112-M-213-010-MY3. 2022.01-2024.07,＄5,189,000元（台幣） (role:PI)
Reviewer - NPG Asia Materials(2019), New Journal of Physics (2020), Surface Science(2021), Physica Scripta (2024), Journal of Physics D: Applied Physics(2024)
ALS Collaborative Postdoctoral Fellowship (2019-2020)
Academia Sinica Postdoctoral Fellow, Taiwan (2018-2020)
Todai Fellowship, University of Tokyo, Japan (2014-2017)
Graduate Student Fellowship, NSRRC, NTHU, Taiwan (2011-2013)
Recognition, Student Poster Session, 23th NSRRC User Meeting, Taiwan (2017)
Best Student Oral Presentation, Hercules School, Taiwan (2015)
Elite Student Award, NTHU, Taiwan (2012)
Acadmic service
Acadmic service
Jury | International Physics Tournament at US area (2018)
SubMentor | Science program in King middle school, Berkeley (2018)
Teach assistant | Accelerator Physics in NTHU (2013)
Teach assistant | Introduction to Synchrotron Radiation Light Source in NTHU (2012)
Teach assistant | Introduction of Solid State Physics in NTHU (2011)
Teach assistant | General Physics Experiment in NTHU (2010)
Free tutor | Homework assistant at Hsinchu Christian Huai-Chih Teens Care Association (2010-2011)
Teaching
Teaching
Jury | International Physics Tournament at US area (2018)
SubMentor | Science program in King middle school, Berkeley (2018)
Teach assistant | Accelerator Physics in NTHU (2013)
Teach assistant | Introduction to Synchrotron Radiation Light Source in NTHU (2012)
Teach assistant | Introduction of Solid State Physics in NTHU (2011)
Teach assistant | General Physics Experiment in NTHU (2010)
Free tutor | Homework assistant at Hsinchu Christian Huai-Chih Teens Care Association (2010-2011)
演講公告 Talks
110年
9/20 JPS Fall Meeting 2021, invited talk, Ultrafast carrier dynamics in transition metal dichalcogenides
日本物理学会講演概要集 第76巻 第2号 | 2021年秋季大会 (gakkai-web.net)
3/24 交大電物生涯輔導 演講
3/3 前言物理專題 演講
2/2 明志科大 演講
109年
10/8 1:30pm 交大電物專題演講 (NCTU Electrophysics Colloquium) 交大科三館次軒廳+交大物理所專題演講 交大校區科學三館1樓SC110教室(NCTU Institute of Physics Colloquium, NCTU Science Building III 3F SC110)
10/28 1:30pm 交大電物奈米科學導論 (NCTU Electrophysics Introduction to Nano Technology)
12/15 1:30pm 清大物理凝態物理演講 (NTHU Dept. of Physics Condensed matter seminar)
12/30 高師大物理系演講
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