研發替代役 招募中
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。
新聞連結: https://www.nsrrc.org.tw/ViewNews/MediaLayout02.aspx?ViewID=M20230313015138031&Lang=Chinese
TPS39A2 NanoARPES construction
2020.6-now
Dr. Ro-Ya Liu (劉若亞)
About
My research interest focuses on discovering electronic dynamics and band structure of novel quantum materials by using angle-resolved photoemission spectroscopy (ARPES) or time-resolved (TRARPES). Prior to LBNL, I earned a Ph.D. in Physics at the University of Tokyo (under the advisement of Prof. Iwao Matsuda). In my Ph.D., I was challenging frontier ultrafast topics – discovering Floquet-Bloch state, valley-dependent circular polarization, Femto- to Picosecond carrier dynamics, nano-second surface photovoltage relaxation and coherent phonon excitations in transition metal dichalcogenides (TMDCs) monolayers. In ultrafast electronic field, I involved in many big science projects, collaborated with 3 TRARPES groups, 3 free-electron laser based time-resolved experiments, and countless ARPES stations in 6 synchrotron facilities in the world. Beside my main projects, I’ve hosted international users in time-resolved Xray photoemission spectroscopy (TRXPS) station at BL07LSU, SPring-8 for years. In TRXPS station, we discovered surface photovoltage relaxation in nanoseconds at surfaces (solar cell materials, oxides, TMDCs, 2D materials), offering a fundamental understanding for chemical reactions at catalyst surface, and electron-hole combination process in solar cells.
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
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)
Honor and Award
Reviewer - NPG Asia Materials (2019), New Journal of Physics (2020)
ALS Collaborative Postdoctoral Fellowship (2019-now)
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)
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 Autumn Meeting 2021, invited talk, Ultrafast carrier dynamics in transition metal dichalcogenides
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