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
382 2018-11-09 14:30  E6-2. 1st fl. #1323  Moiré superlattices – from twisted bilayer graphene to quasicrystal file
381 2017-04-28 14:30  E6-2. 1st fl. #1323  Hot electron generation at surfaces and its impact to catalysis and renewable energy conversion
380 2018-12-11 16:00  E6-2. 1st fl. #1323  Natural compact representation of Matsubara Green’s functions: applications to analytic continuation and quantum many-body simulations file
379 2017-09-22 13:00  E6-2. 1st fl. #1323  Superconductor-metal-insulator transition in thin Tantalum films file
378 2018-10-12 14:30  E6-2. 1st fl. #1323  Quantum Advantage in Learning Parity with Noise file
377 2017-05-12 13:30  E6-2. 1st fl. #1323  Topological Dirac insulator
376 2017-09-22 14:30  E6-2. 1st fl. #1323  Quantum Electronic Transport in Graphene Hybrid Nanostructures file
375 2019-11-01 16:00  E6-2. 1st fl. #1323  Electron transport through weak-bonded contact metal with low dimensional nano-material file
374 2019-09-27 14:30  E6-2. 1st fl. #1323  Spin-charge conversion in topological insulators for spintronic applications file
373 2018-03-16 16:00  E6-2. 1st fl. #1323  Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
372 2018-03-16 16:00  E6-2. 1st fl. #1323  Van der Waals Heterostructures from Quantum Transport to Ultrafast Optoelectronics file
371 2019-03-29 16:00  E6-2. 1st fl. #1323  Coherent Quantum Control and Magnetism on atoms – Trapped ion and ESR STM file
370 2019-04-19 16:00  E6-2. 1st fl. #1323  Graphene and hBN heterostructures file
369 2019-04-19 14:30  E6-2. 1st fl. #1323  A family of finite-temperature electronic phase transitions in graphene multilayers file
368 2018-12-26 16:00  E6-2. 1st fl. #1323  Brane-like defect in 3D toric code file
367 2017-06-02 14:30  E6-2. 1st fl. #1323  Quasiparticle Interference and Fourier transform scanning tunneling spectroscopy in WTe2 (Weyl semimetal) file
366 2016-04-05 16:00  E6-2. 1st fl. #1322  A new impurity solver for multi-orbital systems: adaptive truncation of the Hilbert space
365 2015-09-07 15:00  E6-2. 1st fl. #1318  Advanced Optical Materials and Devices at NRL
364 2016-09-21 16:00  E6-2. #2502(2nd fl.)  Entanglement probe of two-impurity Kondo physics
363 2016-09-29 16:00  E6-2. #2501(2nd fl.)  Exploring the phase diagram of BaBiO3: epic voyage of just another bad trip?