visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-05-24 16:00 
일시 May 24 (Tue) 4 PM 
장소 E6-2. #1323(1st fl.) 
연사 Dr. Euyheon Hwang, SKKU Advanced Institute of Nanotechnology, Sung Kyung Kwan University 

Electronic and magnetic properties of 2D transition-metal thiophosphates and tunability of magnetic order with carrier density

 

May 24 (Tue) 4 PM, E6-2. #1323(1st fl.)
Dr. Euyheon Hwang, SKKU Advanced Institute of Nanotechnology, Sung Kyung Kwan University

 

We present the electronic and magnetic properties of two dimensional (2D) MPX3 (M= transition metal, and X = S, Se, Te) transition metal thiophosphates. The MPX3 are layered van der Waals materials and exhibit novel magnetic order as a single layer. Our calculations of the magnetic ground states in MPX3 single layer compounds predict semiconducting phases with variable band gap sizes down to metallic phases depending on their magnetic orders. A systematic trend of decreasing band gaps in antiferromagnetic states is observed as the chalcogen atoms S, Se, and Te change from smaller to larger atomic number, whereas diverse ground-state phases, e.g., ferromagnetic, antiferromagnetic, and nonmagnetic phases can be expected for different compounds which are accompanied by variations in the lattice constants, and non-negligible distortions in crystal symmetries. In addition, the antiferromagnetic semiconductors of MPX3 single layer show the transition to the ferromagnetic halfmetals with both electron and hole doping, which can be controlled by applying an external gate voltage in the MPX3 field effect transistors (FET). We find that the itinerant d electrons in transition metals induce the ferromagnetic to antiferromagnetic transition accompanied by the metal to semiconductor transition. The sensitive interdependence between the magnetic, structural, and electronic properties suggest important potential of 2D magnetic van der Waals materials for strain and field-effect carrier tunable spintronics.

 

Contact: Sungjae Cho, Physics Dept., (sungjae.cho@kaist.ac.kr)

번호 날짜 장소 제목
522 2016-04-26 16:00  #1323(1st Floor. E6-2)  Transport spectroscopy for electronic bands in carbon-based nanomaterials with weak-bond contacts
521 2016-11-1 10:30  #1323(E6-2 1st fl.)  Time scale dependent dynamics in InAs/InP quantum dot gain media
520 2016-06-01 16:00  #1323(E6-2 1st fl.)  Laboratory experiments relevant to mesospheric clouds, Saturn’s rings & astrophysical jets
519 2016-10-27 16:00  #1323(E6-2)  Terahertz Metal Optics
518 2016-05-19 16:00  #1323(E6-2, 1st fl.)  Nonlinear/quantum optical effect in silicon nano-photonics
517 2016-06-16 16:00  #1323(E6-2, 1st fl.)  Quantum information processing using quantum dots and photonic crystal cavities
516 2016-09-22 15:30  #1323(E6-2, 1st fl.)  Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model
515 2016-05-31 16:00  #1323(E6-2, 1st fl.)  Understanding 3D tokamak physics towards advanced control of toroidal plasma
514 2016-09-22 15:30  #1323(E6-2, 1st fl.)  Polarized 3He, Polarized Neutrons and New Interactions beyond the Standard Model
513 2016-05-16 16:00  #1323(E6-2, 1st Fl.)  Tuning microwave cavities with biased nonlinear dielectrics for axion searches
512 2016-12-09 16:00  #1323(E6-2. 1st fl.  Shift Charge and Spin Photocurrents in Dirac Surface States of Topological Insulator
511 2016-04-19 14:00  #1323(E6-2. 1st fl.)  Nonlocal collisional electron transport in partially ionized plasma generation, structure, and stability
510 2016-12-8 16:00  #1323(E6-2. 1st fl.)  Dynamical Resonance between Two Optical Cavities via Optomechanical Oscillator
509 2017-03-02 16:00  #1323(E6-2. 1st fl.)  “Progress in the comparison of ARPES to DMFT for d and f strongly correlated electron systems”
508 2016-07-08 14:00  #1323(E6-2. 1st fl.)  Electronic quasiparticles in the quantum dimer model
507 2016-07-28 16:00  #1323(E6-2. 1st fl.)  Low Dimensional Electrons: On the Road to Hybrid Quantum Systems
506 2016-12-09 13:30  #1323(E6-2. 1st fl.)  Entanglement area law in strongly-correlated systems
505 2016-11-24 16:00  #1323(E6-2. 1st fl.)  Harmonic oscillator physics with single atoms in a state-selective optical potential
504 2016-11-29 16:00  #1323(E6-2. 1st fl.)  Symmetry Protected Kondo Metals and Their Phase Transitions
503 2016-11-11 16:00  #1323(E6-2. 1st fl.)  Dirac fermions in condensed matters