visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-07-14 15:00 
연사  
장소 E6 #1501 & Zoom 

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 연사 제목
430 2015-11-24 16:00    Topology-based understanding of spin dynamics in inhomogeneously magnetized systems
429 2022-04-01 16:00    High-field Electron Transport and Interaction Induced Phenomena in 2D Materials file
428 2018-11-29 16:00    양자 칸델라 실현을 위한 단일 광자 발생장치 개발 file
427 2024-03-07 16:00    [CAPP seminars] Development of Superconducting Transition Edge Sensors at SRON file
426 2021-06-11 16:00    Pseudogap in surface-doped black phosphorus file
425 2016-11-11 13:30    Bandgap Engineering of Black Phosphorus
424 2016-04-01 14:30    Interference of single charged particles without a loop and dynamic nonlocality
423 2016-05-31 16:00    Understanding 3D tokamak physics towards advanced control of toroidal plasma
422 2023-07-18 11:00    Non-Hermitian Casimir Effect of Magnons
421 2024-06-13 16:00    Magnonic $\varphi$ Josephson junction and its non-Hermitian Josephson diode effect
420 2023-09-14 16:00    [CAPP seminar] Dark matter searches in Water Cherenkov Detectors file
419 2018-05-11 14:30    Disordered Floquet topological insulators file
418 2016-12-09 16:00    Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator
417 2022-05-13 14:30    Topological Superconducting Spintronics Towards Zero-Power Computing Technologies file
416 2021-07-29 14:00    Gravitationally Induced Dark Sector and Inflationary Dynamics file
415 2015-12-11 13:30    Quantum spin liquid in the 1/3 depleted triangular lattice Ba3(Ru1-xIrx)Ti2O9
414 2016-03-11 13:30    Topological phases of matter in nonequilibrium: Topology of the Wannier-Stark ladder
413 2018-11-01 16:00    Direct holography from a single snapshot file
412 2022-08-18 10:00    Disorder-driven phase transition in the second-order non-Hermitian skin effect
411 2023-04-27 11:00    Inverse Shapiro steps and coherent quantum phase slip in superconducting nanowires