분회초청강연

    나노소재

  김도헌 교수 서울대학교

     ■ Education

■ Professional Career

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

■ Professional Career

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

■ Professional Career

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.