visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-10-07 13:30 
일시 Oct. 07 (Fri), 1:30 PM 
장소 E6-2. #1323(1st fl.) 
연사 Dr. Suk Bum Chung, IBS-CCES , Seoul National University 

“Symmetry and topology in transition metal dichalcogenide?”

 

Oct. 07 (Fri), 1:30 PM, E6-2. #1323(1st fl.)
Dr. Suk Bum Chung, IBS-CCES , Seoul National University

 

For the quantum well in an optical microcavity, the interplay of the Coulomb interaction and the electron-photon coupling can lead to the emergence of bosonic quasiparticles consisting of the exciton and the cavity photon known as polariton, which can form the Bose-Einstein condensate above a threshold density. Additional physics comes into play when the quantum well consists of the transition metal dichalcogenide (TMD). The TMD band structure in the low energy spectrum has two valley components with nontrivial Berry phase, which gives rise to a selection rule in the polariton coupling, e.g. the exciton from one (the other) valley can couple only to the clockwise (counter-clockwise) polarized photon. We find that, due to this nontrivial Berry phase, our polariton condensate spontaneously breaks the rotational symmetry and hence may be regarded as a phase of matter. We also investigate how the topology of the TMD polariton condensate is related the exciton symmetry.


Contact: MyungJoon Han, Physics Dept., (mj.han@kaist.ac.kr)

 

번호 날짜 장소 제목
504 2019-08-22 16:00  #1323, E6-2  Physics and Applications in Nanoelectronics and Nonomechanics file
503 2019-07-30 16:00  #1323, E6-2  Dirac fermions and flat bands in correlated kagome metals file
502 2019-06-04 17:00  #1323, E6-2  Stochastic nature of bacterial eradication using antibiotics file
501 2019-05-24 16:00  #1323, E6-2  Infrared spectroscopy study on metal-insulator transitions in layered perovskite iridates file
500 2019-05-09 16:00  #1323, E6-2  Quantum Optical Sensing Using Single Photons And Single Photon Emission from Single Emitters file
499 2019-05-09 16:00  #1323, E6-2  Quantum Optical Sensing Using Single Photons And Single Photon Emission from Single Emitters file
498 2019-05-30 16:00  #1323, E6-2  Tuning the excitonic properties of semiconductors with light-matter interactions file
497 2019-04-19 11:00  #1323, E6-2  First-principles studies of semiconductors for solar cell applications file
496 2019-04-11 16:00  #1323, E6-2  Massive screening for cathode active materials using deep neural network file
495 2019-04-04 16:00  #1323, E6-2  Chiral spin-photon interaction at nanoscale file
494 2019-06-17 10:30  #1323, E6-2  Chiral Spintronics file
493 2019-04-23 16:00  #1323, E6-2  From Mott physics to high-temperature superconductivity file
492 2019-04-26 16:00  #1323, E6-2  Robust Quantum Metrology using Strongly Interacting Spin Ensembles and Quantum Convolutional Neural Network file
491 2018-09-20 16:00  #1323, E6-2  Toward Cancer Treatment Using Terahertz Radiation: Demethylation of Cancer DNA file
490 2018-09-20 16:00  #1323, E6-2  Toward Cancer Treatment Using Terahertz Radiation: Demethylation of Cancer DNA file
489 2019-05-01 16:00  #1323, E6-2  Raman and x-ray scattering study on correlated electron systems: two case examples file
488 2019-05-31 11:00  #1323, E6-2  Cavity QED with Spin Qubits file
487 2019-05-08 16:00  E6 Room(#1323)  Imaging valley dependent electron transport in 2D semiconductors file
486 2018-07-09 14:00  #1323, E6-2  The principles of collective learning file
485 2019-12-13 13:30  #1323, E6-2  Biophysics Mini-symposium at KAIST file