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
400 2022-09-21 10:30  E6-1 #1501  [Update 세미나 영상] Distinguished Lecture 'The Magic of Moiré Quantum Matter' Prof. Pablo Jarillo-Herrero(Department of Physics, MIT) file
399 2022-09-15 13:00  E6-2, #1323  AdS black holes: a review
398 2022-08-18 10:00  E6-1 #1323  Disorder-driven phase transition in the second-order non-Hermitian skin effect
397 2022-08-17 11:00  E6-6 #118호  Robust Hamiltonian Engineering of Large Quantum Systems (큰 양자시스템의 견고한 해밀토니안 엔지니어링)
396 2022-08-12 10:00  E6-1 #1323  Twisted Bilayer Magnets file
395 2022-08-12 10:00  E6-1 #1323  Twisted Bilayer Magnets file
394 2022-08-09 14:00  KI building (E4), Lecture Room Red (B501)  Quantum biology in fluorescent protein: a new model system to study quantum effects in biology file
393 2022-08-08 14:00  E6-2 #2502  Classical Shadow Tomography for Analog Quantum Simulators
392 2022-08-01 10:00  E6 #1501 & Zoom  [Update 세미나 영상] James Webb Space Telescope & OTE Commissioning
391 2022-07-21 16:00  CAPP Seminar Room C303, Creation Hall, KAIST Munji Campus  Quintessential axions file
» 2022-07-14 15:00  E6 #1501 & Zoom  Pure two-dimensional quantum electron liquid and its phase transition
389 2022-07-14 14:15  E6 #1501 & Zoom  Hund and electronic correlations in ruthenium-based systems
388 2022-07-14 13:30  E6 #1501 & Zoom  Electronic structure and anomalous transport properties of topological materials by first principle calculation
387 2022-06-23 11:00  E6 Room(#1322)  JILA’s search for the electron’s Electric Dipole Moment (eEDM) to probe physics beyond the standard model file
386 2022-06-10 16:00  E6-2. 1st fl. #1323  Fe5GeTe2의 나선형 자성특성과 자기저항의 전류밀도 의존성 연구 file
385 2022-06-10 14:30  E6-2. 1st fl. #1323  Combinatorial strategy for condensed matter physics: study on rare earth hexaborides thin films file
384 2022-06-10 11:00  Online seminar  Record-quality two-dimensional electron systems file
383 2022-06-03 11:00  E6-2 #1323  (응집물리 세미나) Theoretical Investigation of Exotic Quantum States in Low-dimensional Materials
382 2022-06-03 09:30  Online seminar  (Quantum-&Nano-Photonics Webinar) Seeing glass in a new light: reimagine chalcogenide photonics file
381 2022-05-30 16:00  E6, #1501  Light manipulation using 2D layered semiconductors