분회초청강연



    나노소재

  김도헌 교수 서울대학교


     ■ Education


2013Ph.D
Physics
University of Maryland
2009
Material Science
Yonsei University
2006Material Science
Yonsei University




■ Professional Career


2016.3 - Present
Assistant and Associate Professer
Physics and Astronomy
Seoul National University, Korea.
2015.3 -  2016.2
Assistant Professor
Material Science and Engineering
Yonsei University, Korea.
 2013.6 –  2015.2
Postdoctoral researcher
Physics department
University of Wisconsin, USA




Semiconductor spin qubit-based quantum information experiments


Quantum computers operating according to the laws of quantum mechanics have undergone conceptual development based on theoretical science for the past 30 years, and nowadays intensive efforts are made on small-scale operation demonstrations and large-scale integration. In this talk, I will introduce the field of developing quantum information hardware based on solid state device with emphasis on Gate-defined quantum dot spin qubits. In particular, the current stage of quantum engineering is often referred to as Noisy Intermediate Scale Quantum (NISQ), that is, the era of medium-scale quantum computing of 50-100 qubits operating without quantum error correction. We will look at the utility of such quantum computers and look at the efforts to develop large-scale quantum computers with error correcting capability.




  천동원 박사 KIST(서울과학기술연구원)


     ■ Education


1998 - 2005

B. S. 

Metallurgical Engineering

Yonsei University, Seoul, Korea

2005 - 2007

M. S. 

Metallurgical Engineering

Yonsei University, Seoul, Korea

2013 - 2016

Ph. D. 

Materials Science & Engineering

University of California San Diego, San Diego, California, U.S.A



■ Professional Career


2007 - 2012

Research Scientist

Korea Institute of Science and Technology (KIST), Seoul, Korea

2013 - 2016

Research Assistant and Teaching Assistant

University of California San Diego, San Diego, California, U.S.A

2016 - Present

Senior Researcher

Advanced Analysis Center

Korea Institute of Science and Technology (KIST), Seoul, Korea



Hexagonal Close-packed Palladium Hydride in Liquid Cell TEM


Metastable phases—kinetically favored structures—are ubiquitous in nature. Rather than forming thermodynamically stable ground-state structures, crystals grown from high-energy precursors often adopt metastable structures, and they undergo a series of transformations to energetically stable lower-energy phases, as described by Wilhelm Ostwald. The most common strategy for synthesizing a metastable material is by means of manipulating thermodynamic conditions that mostly depend on heuristic, on the basis of experiences, intuitions, or even speculative predictions. The new design rule is embodied in the discovery of a metastable hexagonal close-packed (HCP) palladium hydride (Pd-H), synthesized in a liquid cell environment using a transmission electron microscope (TEM).

In this talk, I will introduce metastable HCP Pd-H and its distinctive properties compared with its FCC counterpart. Furthermore, growth mechanism of HCP Pd-H will be discussed that could provide a new thermodynamic insight into metastability-engineering strategy to be deployed in discovering new metastable phases.



  강주훈 교수 성균관대학교


     ■ Education


2018 - 2019

Postdoctoral Scholar

Chemistry

University of California at Berkeley, Berkeley, CA, USA

2012 - 2018

Ph.D.

Materials Science and Engineering

Northwestern University, Evanston, IL, USA

2009 - 2011

M.S.

Materials Science and Engineering

Yonsei University, Seoul, South Korea



■ Professional Career


2019 - Present

Assistant Professor

School of Advanced Materials Science and Engineering

Sungkyunkwan University (SKKU), Suwon, South Korea 

2018 - 2019

Research Affiliate

Organic and Macromolecular Synthesis

Molecular Foundry Lawrence Berkeley National Laboratory, Berkeley, CA, USA




Chemically-Welded Nanomaterials for Scalable Optoelectronics


Metastable phases—kinetically favored structures—are ubiquitous in nature. Rather than forming thermodynamically stable ground-state structures, crystals grown from high-energy precursors often adopt metastable structures, and they undergo a series of transformations to energetically stable lower-energy phases, as described by Wilhelm Ostwald. The most common strategy for synthesizing a metastable material is by means of manipulating thermodynamic conditions that mostly depend on heuristic, on the basis of experiences, intuitions, or even speculative predictions. The new design rule is embodied in the discovery of a metastable hexagonal close-packed (HCP) palladium hydride (Pd-H), synthesized in a liquid cell environment using a transmission electron microscope (TEM).

In this talk, I will introduce metastable HCP Pd-H and its distinctive properties compared with its FCC counterpart. Furthermore, growth mechanism of HCP Pd-H will be discussed that could provide a new thermodynamic insight into metastability-engineering strategy to be deployed in discovering new metastable phases.