visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나

Bandgap Engineering of Black Phosphorus

2016.11.08 17:02

Physics 조회 수:2551

날짜 2016-11-11 13:30 
연사  
장소 #1323(E6-2. 1st fl.) 

Bandgap Engineering of Black Phosphorus

 

Nov. 11th(Fri), 1:30 p.m. #1323(E6-2. 1st fl.)
Dr. Keun Su Kim, POSTECH

 

Two-dimensional (2D) atomic crystals have emerged as a class of materials that may impact our future electronics technology. A key issue is controlling their electronic state to overcome the limit of natural properties. Black phosphorus is an emergent 2D atomic crystal that is attracting growing interest owing to its promising device characteristics1. In this talk, I will introduce our recent angle-resolved photoemission spectroscopy studies on the widely tunable bandgap of black phosphorus. The in-situ deposition of alkali-metal atoms on the surface of black phosphorus produces strong vertical electric field, modulating the bandgap from a narrow-gap semiconductor to a zero-gap semimetal2. At the critical point of this semiconductor-semimetal transition, black phosphorus is an unusual zero-gap semimetal, whose band dispersion is highly anisotropic, linear in armchair and quadratic in zigzag directions2. I will also briefly discuss about the future direction of this emerging field.


References
1. X. Ling et al., PNAS 112, 4523 (2014).
2. J. Kim et al., Science 349, 723 (2015).

 

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

 

번호 날짜 연사 제목
477 2016-10-27 16:00    Terahertz Metal Optics
476 2016-11-01 14:30    Search for dark sector particles in the B-factory experiments
475 2016-11-04 13:30    Exotic phenomena at oxide LaAlO3/SrTiO3 hetero-interface and their applications
474 2016-11-04 15:00    Quantum information experiments using few electron spins in semiconductors
473 2016-11-1 10:30    Time scale dependent dynamics in InAs/InP quantum dot gain media
472 2016-11-10 16:00    Low Dimensional Active Plasmonics and Electron Optics in Graphene
» 2016-11-11 13:30    Bandgap Engineering of Black Phosphorus
470 2016-11-11 16:00    Dirac fermions in condensed matters
469 2016-11-16 16:00    Realizing Haldane Model in Fe-based Honeycomb Ferromagnetic Insulators
468 2016-11-18 10:30    Non-equilibrium many-body spin dynamics in diamond
467 2016-11-24 16:00    Harmonic oscillator physics with single atoms in a state-selective optical potential
466 2016-11-29 16:00    Symmetry Protected Kondo Metals and Their Phase Transitions
465 2016-12-09 13:30    Entanglement area law in strongly-correlated systems
464 2016-12-09 16:00    Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator
463 2016-12-12 13:30    “Possible symmetry in the phase diagrams of electron- & hole-doped cuprate high-Tc superconductors”
462 2016-12-8 16:00    Dynamical Resonance between Two Optical Cavities via Optomechanical Oscillator
461 2017-01-09 16:00    Topological Defects and Phase Transitions" file
460 2017-02-01 14:00    Quantum electron optics using flying electrons
459 2017-03-02 16:00    “Progress in the comparison of ARPES to DMFT for d and f strongly correlated electron systems”
458 2017-03-06 16:00    Spring 2017: Physics Colloquium file