visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-05-24 16:00 
연사  
장소 E6-2. #1323(1st fl.) 

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 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
334 2019-12-13 13:30    Biophysics Mini-symposium at KAIST file
333 2019-12-18 16:00    Road to Higher Tc Superconductivity file
332 2019-12-27 15:00    The superconducting order parameter puzzle of Sr2RuO4 file
331 2019-12-27 15:00    The superconducting order parameter puzzle of Sr2RuO4 file
330 2020-01-17 16:00    Symmetry Breaking and Topology in Superfluid 3He file
329 2020-02-12 13:00    From inflation to new weak-scale file
328 2020-02-13 16:30    Enhanced Light-Matter Interactions in Graphene with Noble Metal Plasmonic Structures file
327 2020-02-20 16:00    Unconventional superconductivity in the locally non-centrosymmetric heavy-fermion CeRh2As2 file
326 2020-07-02 16:00    An irreversible qubit-photon coupling for the detection of itinerant microwave photons file
325 2020-08-17 20:00    Using magnetic tunnel junctions to compute like the brain file
324 2020-08-25 20:00    KAIST Global Forum for Spin and Beyond (Second Forum) file
323 2020-09-11 14:00    SRC Seminar file
322 2020-09-14 17:30    KAIST Global Forum for Spin and Beyond (Third Forum) file
321 2020-09-22 09:30    Physics and applications of soliton microcombs(Quantum- & Nano-Photonics) file
320 2020-09-24 09:00    (CAPP/IBS)Searching for Dark Matter with a Superconducting Qubit , Cryogenic Microwave Circuit Development at the NSTU file
319 2020-09-28 17:30    KAIST Global Forum for Spin and Beyond(Fourth Forum) file
318 2020-10-09 09:00    Quantum Many-Body Simulation file
317 2020-10-15 16:00    Graphene-based Josephson junction microwave bolometer file
316 2020-10-15 16:00    Towards resource-efficient and fault-tolerant quantum computation with nonclassical light
315 2020-10-15 17:00    Time crystals, quasicrystals, and time crystal dynamics in the superfluid universe file