• Up to 50 free e-prints of our recent work on NbSe2 can be downloaded via this link. posted on Jun 12, 2024.

• Chi-Cheng is selected as an outstanding referee by the American Physical Society (APS) in 2024. [淡江時報報導] posted on Mar 11, 2024.

• 賀Chin-En參加淡江大學理學院學生論文展獲得院長獎。posted on Jun 7, 2023.

• The 21th Workshop on First-Principles Computational Materials Physics will be held in National Sun Yat-Sen University, Kaohsiung, Taiwan on June 29-30, 2023. posted on Jun 7, 2023.

• 2023 NCTS-KIAS workshop on ab initio approaches to quantum materials wil be held in National Taiwan University, Taipei, Taiwan on April 27-29, 2023. posted on Mar 28, 2023.

• The 21st Taiwan-Japan-Korea symposium on strongly correlated electron systems (TJK21) will be held in NSRRC, Hsinchu, Taiwan on April 6-7, 2023. posted on Mar 28, 2023.

• The work on "Atomically thin metallic Si and Ge allotropes with high Fermi velocities" has been accepted for publication in Physical Review B. posted on Feb 24, 2023.

• Chi-Cheng 被選入全球前 2% 頂尖科學家之2021年度科學影響力排行榜。[淡江時報報導]. posted on Nov 12, 2022.

• The 20th workshop on first-principles computational materials physics will be held on 9/1 and 9/2. posted on Aug 10, 2022.

• 賀Chieh-Chun申請科技部大專學生研究計畫通過。posted on Jun 26, 2022.

• Chi-Cheng 被選入全球前 2% 頂尖科學家之2020年度科學影響力排行榜。[淡江時報報導]. posted on Dec 4, 2021.

• Chieh-Chun, Chang-Yu, Jhe-Hao, and Chin-En will present posters discussing optical properties of diamond, silicon, and cobalt and Raman spectrum in graphene/h-BN heterostructures, respectively, during the Physics Week held in Science Hall, Tamkang University between Nov 29 and and Dec 3, 2021. posted on Nov 28, 2021. 

• Chi-Cheng will present a talk, "固態材料裡的世界：磁單極", in S215, Science Hall, Tamkang University between 12:40 and 13:00 on Nov 29, 2021. posted on Nov 26, 2021. 

• 2021物理週-學術發表@淡江大學科學館11/29~12/03 (12:00~13:00 everyday)。歡迎各位同學前來共襄盛舉。posted on Nov 24, 2021.  

• The work on "Photocurrent-driven transient symmetry breaking in the Weyl semimetal TaAs" is just published online in Nature Materials (2021). [A view-only version is available here]. posted on Nov 9, 2021.  

• The work on "Modulating Chemical Composition and Work Function of Suspended Reduced Graphene Oxide Membranes Through Electrochemical Reduction" has been accepted for publication in Carbon. posted on Sep 15, 2021. [free access before Nov. 14, 2021]

• NTNU & Tamkang Physics Online Workshop will be held today. posted on Sep 7, 2021.

• The 19th workshop on first-principles computational materials physics (online workshop) will be held on Sep 2 and Sep 3, 2021. Most researchers working in the related fields in Taiwan will join this workshop. posted on Aug 31, 2021.

• The work on "The hidden competing phase revealed by first-principles calculations of phonon instability in the nearly optimally doped cuprate La1.875Sr0.125CuO4" has been accepted for publication in Physical Review B. posted on Aug 17, 2021.

• Chi-Cheng will present a talk, "Fermi arc, pseudo gap, and the LTLO Phase in Sr-doped La2CuO4", in an online seminar, NCTS beween 14:00 and 15:00 on Aug 12, 2021. posted on Jul 23, 2021.

• Chi-Cheng will present a talk, "First-principles calculations of phonon instability in the nearly optimally doped cuprate La1.875Sr0.125CuO4", in S215, Science Hall, Tamkang University between 14:10 and 15:00 on Apr 13, 2021. posted on Apr 7, 2021.         

• Chi-Cheng will present a talk, "Applications of density functional theory: from single-particle picture to many-body physics", in the 1st meeting room, 5th floor, Institute of Physics, Academia Sinica between 11:00 and 12:00 on Dec 17, 2020. posted on Dec 11, 2020.

• The news for our work on the flat band in 2-dimensional Ge layer can be found here. posted on Dec 11, 2020.

• The work on "Emergence of Nearly Flat Bands through a Kagome Lattice embedded in an Epitaxial Two-dimensional Ge layer with a Bitriangular Structure" has been accepted for publication as a Rapid Communication in Physical Review B. posted on Oct. 25, 2020.

• The work on "Partitioning interatomic force constants for first-principles phonon calculations: Applications to NaCl, PbTiO3, monolayer CrI3, and twisted bilayer graphene" has been accepted for publication in Journal of Physics: Condensed Matter. posted on Oct. 25, 2020. 

We are interested in the electronic-structure calculations using first-principles approaches and tight-binding model Hamiltonians. We are also interested in developing new methods that can be applied to the research related to condensed matter physics and materials science based on quantum mechanics. 

Focused topics are

‧ Electronic structures of real materials

‧ Lattice dynamics in real materials

‧ Phase transitions under high pressure 

‧ Magnetic, orbital, charge, and lattice structures in correlated materials 

‧ Local excitations of correlated materials

‧ Two-dimensional materials: Graphene, silicene, borophene, etc.

‧ Topological insulators and Weyl semimetals

‧ Exciton dynamics in weakly interacting systems and correlated Mott insulators

對Linux作業系統有基本認識與會撰寫簡單程式(或有高度興趣)的同學，歡迎加入我們的研究行列。

你可能會學習到的內容：

1. 如何描述金屬、絕緣體與半導體材料的幾何結構。

2. 如何描述金屬、絕緣體與半導體材料的電子能帶結構。

3. 了解新穎材料中的原子如何振動。

4. 探究較大尺度下凝態物質的幾何結構與電子結構。

5. 學習如何計算新穎材料中電子的激發態。

6. 你有聽過第一原理計算與密度泛函理論嗎? 想要學習更多與密度泛函理論相關的知識嗎?

7. 你有聽過目前科學家還沒找到磁單極嗎? 在固態物質中，物理學家發現可以找到與磁場行為一樣的物理量，而在動量空間中，磁單極是存在的!? 這與電子波函數的拓墣性質有關。想要多了解這方面的物理嗎?

8. 你有聽過費曼圖嗎? 量子力學中的微擾理論所給出的數學式子很複雜，但若用畫圖的方式來表達格林函數，數學與物理都變得有趣了。我們在了解固態系統的多體行為時，常常會用到費曼圖，想了解多體物理與費曼圖嗎?