visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-10-07 13:30 
연사  
장소 E6-2. #1323(1st fl.) 

“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 연사 제목
496 2016-06-16 16:00    Quantum information processing using quantum dots and photonic crystal cavities
495 2016-07-07 14:00    Let there be topological superconductors
494 2016-07-08 11:00    Isostatic magnetism
493 2016-07-08 14:00    Electronic quasiparticles in the quantum dimer model
492 2016-07-28 16:00    Low Dimensional Electrons: On the Road to Hybrid Quantum Systems
491 2016-08-04 14:30    Relational Logic (with applications to Quantum Mechanics, String Theory, Cosmology, Neutrino Oscillations, Statistical Mechanics)
490 2016-09-02 14:30    Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction
489 2016-09-02 16:00    Quantum Electrical Transport in Topological Insulator Nanowires
488 2016-09-05 16:00    Physics Colloquium : 2016 Fall file
487 2016-09-21 16:00    Entanglement probe of two-impurity Kondo physics
486 2016-09-22 15:30    Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model
485 2016-09-22 15:30    Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model
484 2016-09-29 16:00    2016 Fall, Physics Seminar Serises file
483 2016-09-29 16:00    Exploring the phase diagram of BaBiO3: epic voyage of just another bad trip?
482 2016-09-29 16:00    Large-scale Silicon Photonic MEMS Switches
» 2016-10-07 13:30    “Symmetry and topology in transition metal dichalcogenide?”
480 2016-10-07 16:00    “Tilt engineering of 4d and 5d transition metal oxides?”
479 2016-10-17 11:00    IMS and examples of the studies on optoelectronic materials
478 2016-10-18 13:30    "Visualization of oxygen vacancy in motion and the interplay with electronic conduction"
477 2016-10-18 15:00    “Hybrid quantum systems with mechanical oscillators”