visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-07-14 15:00 
일시 Jul. 14th (THU), 15:00 
장소 E6 #1501 & Zoom 
연사 Dr. Sunghun Kim(Institute of Natural Science, KAIST) 

7/14(목) 물리학과 문은국 교수 연구실에서 개최하는 세미나를 안내 드립니다.

 

- Title: Pure two-dimensional quantum electron liquid and its phase transition
- Speaker: Dr. Sunghun Kim(Institute of Natural Science, KAIST)
-  Date: Jul. 14th (THU), 15:00, E6 #1501

https://us02web.zoom.us/j/87068327099?pwd=SXlyZTRkSnhEeW1GTlFjaW45SW1nUT09

회의 ID: 870 6832 7099

암호: 977538

 

Abstract: 

Pure electrons spread in two-dimensional (2D) space can have several different phases of gas, liquid, and even solid – so called Wigner crystal, determined by their kinetic and potential energies. In quantum regime, it is expected to have diverse intermediate phases between Fermi liquid and Wigner crystal phase rendered by the quantum fluctuation with exclusive electron-electron interactions. In this regard, there have been many efforts to realize pure quantum electron phases and unveil its intriguing physics. However, the requirements to realize such quantum electrons at solid systems set a huge hurdle that the most of the experimental investigations have been limited in the classical regime so far. 

 

In this talk, I present the discovery of pure 2D quantum electron liquid formed on solid 2D electride at relatively high temperature of 10 K and its phase transition. Using photoemission spectroscopy and first-principles calculation, we characterized the dense surface electrons decoupled from the top-most layer that means free from other degrees of freedom. By reducing the density of 2D electron system, we observed dynamics change to that of non-Fermi liquid along with anomalous band deformation, accompanied by conserved translational symmetry and reduced rotational symmetry, that suggests a possible phase transition to the hexatic liquid crystal phase. These results can provide further opportunities to study the role of electron-electron interaction which can drive Wigner crystal and various intermediate phases in quantum regime
번호 날짜 장소 제목
373 2022-05-19 15:00  online  (광학분야 특별세미나)Development of a multimodal optical system for improved disease diagnosis
372 2022-05-19 15:00  online  (광학분야 특별세미나)Development of a multimodal optical system for improved disease diagnosis
371 2022-05-18 16:00  E6-2. #1323 & Zoom  Geometry, Algebra, and Quantum Field Theory
370 2022-05-16 16:00  E6, #1501  Design synthetic topological matter with atoms and lights
369 2022-05-13 16:00  자연과학동(E6-2) 1st fl. #1323  High-fidelity iToffoli gate for fixed-frequency superconducting qubits file
368 2022-05-13 14:30  Zoom webinar  Topological Superconducting Spintronics Towards Zero-Power Computing Technologies file
367 2022-05-12 16:00  E6-2. #1323 & Zoom  New frontiers of electroweak physics at the LHC
366 2022-05-11 16:00  E6-2. #1323 & Zoom  Gravity as a phenomenon in quantum dynamics
365 2022-05-10 16:00  E6 1323  (광학분야 특별세미나)Testing quantum thermodynamics using quantum optics
364 2022-05-09 16:00  E6, #1501  Searching for new electronic properties in correlated material flatland
363 2022-05-02 16:00  E6, #1501  What can we learn from the history of science and technology?(우리말강의)
362 2022-04-28 16:00  E6 1323  (광학분야 특별세미나)Adiabaticity and symmetry in optical waveguide design
361 2022-04-25 16:00  E6, #1501  Ultrafast electron beam, a tool to explore the nanoscopic world of materials(우리말강의)
360 2022-04-15 11:00  Online seminar  (응집물리 세미나) First-principles studies of polar oxides and their applications file
359 2022-04-14 16:00  E6 1323  (광학분야 특별세미나)Holographic tomography of dielectric tensors at optical frequency
358 2022-04-13 10:30  E6 #1323/zoom  Harnessing topology and correlations from singularities in 3d-kagome metals
357 2022-04-11 16:00  E6, #1501  Emergence of Statistical Mechanics in Quantum Systems
356 2022-04-08 11:00  E6-1 #1323  (응집물리 세미나) Flat-surface-assisted physical phenomena occurring in single crystal metal thin film file
355 2022-04-04- 16:00  E6, #1501  New paradigms in Quantum Field Theory
354 2022-04-01 16:00  Zoom webinar  High-field Electron Transport and Interaction Induced Phenomena in 2D Materials file