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Young Woo Choi

Postdoctoral Researcher
Department of Physics
University of California, Berkeley

Experience

Postdoctoral Researcher, Department of Physics, University of California, Berkeley
Jun 2021 - present (Advisor: Prof. Marvin L. Cohen)

Postdoctoral Researcher, Department of Physics, Yonsei University, Seoul, Korea
Mar 2021 - May 2021 (Advisor: Prof. Hyoung Joon Choi)

Education

Ph.D. in Physics, Department of Physics, Yonsei University, Seoul, Korea
Mar 2016 - Feb 2021 (Advisor: Prof. Hyoung Joon Choi)

B.S. in Physics, Department of Physics, Yonsei University, Seoul, Korea
Mar 2010 - Feb 2016 (Mandatory military service from Oct 2012 to Jul 2014)

Research Interests

Calculation of electronic properties and many-body interactions in quantum materials
Electrons and phonons in moiré materials, electron-phonon coupling and superconductivity in graphene moiré flat bands, 2D pseudospin semiconductors, Fe-based superconductors

Design of functional nanomaterials and nanostructures for next-generation quantum devices
One-dimensional van der Waals heterostructures, molecular nanomachines, pseudospin tunneling junctions, topological graphene nanoribbon devices

Development of electronic-structure methods using high-performance computing
Density functional theory, large-scale tight-binding calculations, many-body perturbation theory

Publications

11. Jeehong Park†, Soonsang Huh†, Young Woo Choi†, Donghee Kang, Minsoo Kim, Donghan Kim, Soohyung Park, Hyoung Joon Choi, Changyoung Kim, Yeonjin Yi,
Visualizing the low-energy electronic structure of prototypical hybrid halide perovskite through clear band measurements,
ACS Nano 18, 7570 (2024). († Equal Contributions)

10. Yangjin Lee†, Young Woo Choi†, Kihyun Lee, Chengyu Song, Peter Ercius, Marvin L. Cohen, Kwanpyo Kim, and Alex Zettl,
One-dimensional Magnetic MX3 Single-Chains (M=Cr, V and X=Cl, Br, I),
Advanced Materials, 2307942 (2023). († Equal Contributions)

9. Soo Yeon Lim†, Han-gyu Kim†, Young Woo Choi†, Takashi Taniguchi, Kenji Watanabe, Hyoung Joon Choi, and Hyeonsik Cheong,
Modulation of phonons and excitons due to moiré potentials in twisted-bilayer of WSe2/MoSe2,
ACS Nano 17, 13938 (2023). († Equal Contributions)

8. Yangjin Lee†, Young Woo Choi†, Kihyun Lee, Chengyu Song, Peter Ercius, Marvin L. Cohen, Kwanpyo Kim, and Alex Zettl,
Tuning the Sharing Modes and Composition in a Tetrahedral GeX2 (X = S, Se) System via One-Dimensional Confinement,
ACS Nano 17, 8734 (2023). († Equal Contributions)

7. Jangwon Kim†, Youjin Lee†, Young Woo Choi†, Taek Sun Jung, Suhan Son, Jonghyeon Kim, Hyoung Joon Choi, Je-Geun Park, and Jae Hoon Kim,
Terahertz spectroscopy and DFT analysis of phonon dynamics of the layered van der Waals semiconductor Nb3X8 (X = Cl, I),
ACS Omega 8, 14190 (2023). († Equal Contributions)

6. Young Woo Choi and Marvin L. Cohen,
Resonantly Enhanced Electromigration Forces for Adsorbates on Graphene,
Physical Review Letters 129, 206801 (2022).

5. Young Woo Choi and Hyoung Joon Choi,
Dichotomy of Electron-Phonon Coupling in Graphene Moiré Flat Bands,
Physical Review Letters 127, 167001 (2021) [arXiv:2103.16132].

4. Young Woo Choi and Hyoung Joon Choi,
Anisotropic Pseudospin Tunneling in Two-Dimensional Black Phosphorus Junctions,
2D Materials 8, 035024 (2021) [arXiv:2109.00897].

3. Young Woo Choi and Hyoung Joon Choi,
Intrinsic band gap and electrically tunable flat bands in twisted double bilayer graphene,
Physical Review B 100, 201402(R) (2019) [arXiv:1903.00852].

2. Young Woo Choi and Hyoung Joon Choi,
Role of Electric Fields on Enhanced Electron Correlation in Surface-Doped FeSe,
Physical Review Letters 122, 046401 (2019) [arXiv:1901.04062].

1. Young Woo Choi and Hyoung Joon Choi,
Strong electron-phonon coupling, electron-hole asymmetry, and nonadiabaticity in magic-angle twisted bilayer graphene,
Physical Review B 98, 241412(R) (2018) [arXiv:1809.08407].

Honors and Awards

Post-doctoral Training Grants, National Research Foundation, 2023
Global Ph.D. Fellowship, National Research Foundation, 2017-2020
Yonsei Alumni Scholarship, 2012, 2014-2015
Excellent Paper Award, Korea Institute of Science and Technology Information, 2019
Excellent Presentation Award, 15th KIAS Electronic Structure Calculation Workshop, 2019
Excellent Presentation Award, Korean Physical Society Spring Meeting, 2019
Excellent Presentation Award, APCTP-KIAS Quantum Materials Symposium, 2019
Excellent Presentation Award, Korean Physical Society Spring Meeting, 2017
Best Presentation Award, KIAS Physics Winter Camp, 2016

Computational Skills

Ab initio electronic structure calculation
SIESTA, Quantum ESPRESSO, EPW, BerkeleyGW, WIEN2k+EDMFT

Numerical programming
Fortran, Python, MPI, Mathematica, C++, Julia

General programming
Linux cluster operation & maintenance, Web programming

Teaching Experience

TA, Quantum Mechanics (Undergraduate Course)
Spring 2016, Fall 2016, Spring 2017

TA, Introduction to medical physics (Graduate Course)
Fall 2017

TA, Quantum Mechanics (Graduate Course)
Spring 2018, Fall 2018

TA, Statistical Mechanics (Undergraduate Course)
Fall 2019, Fall 2020

TA, Thermal Physics (Undergraduate Course)
Spring 2020

Invited Talks

  1. Atomistic study of electronic properties of graphene moiré flat bands KAIX Future Physics Workshop, KAIST, Daejeon, Dec 26, 2022
  2. Electronic-structure study of interaction effects in two-dimensional materials vdWMRC Satelite Session, ISPSA 2022, Jul 21, 2022
  3. Introduction to first-principles density functional theory calculations Lecture Y Physics Winter School, Yonsei University (virtual), Jan 14, 2022

Seminars

  1. Resonantly Enhanced Electromigration Forces for Adsorbates on Graphene KIAS, Seoul, Dec 22, 2022
  2. Exploring Novel Electronic Properties of Two-Dimensional Materials: Moiré Superlattices, Pseudospin Semiconductors, and Nanomachines KENTECH, Naju, Dec 21, 2022
  3. Resonantly Enhanced Electromigration Forces for Adsorbates on Graphene Soongsil University, Seoul, Dec 15, 2022
  4. Resonantly Enhanced Electromigration Forces for Adsorbates on Graphene Yonsei University, Seoul, Dec 14, 2022
  5. Exploring Novel Electronic Properties of Two-Dimensional Materials: Moiré Superlattices, Pseudospin Semiconductors, and Nanomachines KIST, Seoul, Dec 13, 2022
  6. Electronic structure and electron-phonon coupling in graphene moiré flat bands Soongsil University, Seoul, May 13, 2021
  7. Atomistic study of electron-phonon interaction in magic-angle twisted bilayer graphene University of Seoul, February 15, 2019

International Conference Presentations

  1. Resonantly Enhanced Electromigration Forces for Adsorbates on Graphene Contributed talk American Physical Society March Meeting, Las Vegas, NV, USA, Mar 6-10, 2023
  2. Electronic Structure and Electron-Phonon Coupling in Graphene Moiré Superlattices Contributed talk Asia-Pacific Conference on Condensed Matter Physics 2021 (online), Dec 1-3, 2021
  3. Atomistic study of electron-phonon coupling in twisted graphene layers Contributed talk American Physical Society March Meeting (online), USA, Mar 15-19, 2021
  4. Atomistic study of Electronic and Phononic Properties of Twisted Graphene Layers Contributed talk The 14th Asia Pacific Physics Conference, Kuching, Malaysia, Nov 17-21, 2019
  5. Atomistic Study of Electronic Structure and Electron-Phonon Coupling in Twisted Graphene Layers Poster The 22nd Asian Workshop on First-Principles Electronic Structure Calculations, Osaka University, Japan, Oct 28–30, 2019
  6. Atomistic study of electron-phonon coupling in magic-angle twisted bilayer graphene Contributed talk American Physical Society March Meeting, Boston, MA, USA, Mar 4-8, 2019
  7. Role of the charge-transfer induced electric field in potassium-dosed FeSe layers Contributed talk American Physical Society March Meeting, Los Angeles, CA, USA, Mar 5-9, 2018
  8. Effects of the potassium dosing on the electronic correlation in FeSe : DFT+DMFT study Contributed talk American Physical Society March Meeting, New Orleans, LA, USA, Mar 13-17, 2017

Domestic Conference Presentations

  1. Crucial role of sublattice polarization on electron-phonon coupling in twisted graphene layers Contributed talk Korean Physical Society Spring Meeting (online), Korea, Apr 21-23, 2021
  2. Pseudospin tunneling in two-dimensional black phosphorus junctions Contributed talk Korean Physical Society Fall Meeting (online), Korea, Nov 4-6, 2020
  3. Electron-Phonon Coupling in Twisted Double Bilayer Graphene Contributed talk The Korean Physical Society Fall Meeting, Gwangju, Korea, Oct 23-25, 2019
  4. Role of Electric Fields on Electron Correlation in Surface-Doped FeSe Poster 11th International Conference on Magnetic and Superconducting Materials, Seoul, Korea, Aug 17-24, 2019
  5. Atomic and Electronic Structure of Twisted Graphene Layers Poster The 15th KIAS Electronic Structure Calculation Workshop, Korea Institute for Advanced Study, Seoul, Korea, Jul 4-5, 2019
  6. Atomistic Study on the Electronic Structure of Twisted Double Bilayer Graphene Contributed talk The Korean Physical Society Spring Meeting, Daejeon, Korea, Apr 24-26, 2019
  7. Effects of electric fields on electron correlation in surface-doped FeSe Poster APCTP-KIAS Quantum Materials Symposium 2019, YongPyong, Korea, Feb 10-15, 2019
  8. Atomistic study of electron-phonon interaction in magic-angle twisted bilayer graphene Poster APCTP-KIAS Quantum Materials Symposium 2019, YongPyong, Korea, Feb 10-15, 2019
  9. Structural relaxation, electronic structure, and electron-phonon coupling in magic-angle twisted bilayer graphene Poster The 21st Asian Workshop on First-Principles Electronic Structure Calculations, KAIST, Daejeon, Korea, Oct 29-31, 2018
  10. Electron-phonon interactions in magic-angle twisted bilayer graphene Contributed talk The Korean Physical Society Fall Meeting, Changwon, Korea, Oct 24-26, 2018
  11. First-principles investigation of off-diagonal electron-phonon interaction in graphene Contributed talk Korean Physical Society Spring Meeting, Daejeon, Korea, Apr 25-27, 2018
  12. First-principles study on the enhanced electronic correlation in the potassium-doped surface layer of FeSe Contributed talk Korean Physical Society Spring Meeting, Daejeon, Korea, Apr 19-21, 2017
  13. Doping dependent electronic correlations in FeSe: DFT+DMFT study Poster The Korean Physical Society Fall Meeting, Gwangju, South Korea, Oct 19-21, 2016
  14. First-principles study of subsurface defects in topological insulator Bi2Se3 including van der Waals interaction Poster Korean Physical Society Spring Meeting, Daejeon, Korea, Apr 20-22, 2016