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
420 2019-03-26 15:00  E6-2. 2st fl. #2501  Consideration of thermal Hall effect in frustrated and un-frustrated quantum magnets file
419 2019-01-07 15:00  E6-2. 2st fl. #2501  Many-Body Invariants for Multipoles in Higher-Order Topological Insulators file
418 2018-06-18 10:00  E6-2. 2nd fl. #2502  Rydberg electromagnetically induced transparency and microwave-to-optical conversion using Rydberg atoms file
417 2019-01-09 16:00  E6-2. 2nd fl. #2501  Molecular Mott state in the deficient spinel GaV4S8 file
416 2015-10-16 16:00  E6-2. 2nd fl. #2501  Fluctuations of entropy production in partially masked electric circuits
415 2015-09-14 14:00  E6-2. 2nd fl. #2501  Ultrafast X-ray Studies on Dynamics Matter in Extreme Conditions
414 2016-04-01 14:30  E6-2. 1st fl. #1501  Interference of single charged particles without a loop and dynamic nonlocality
413 2016-04-01 16:15  E6-2. 1st fl. #1501  Cotunneling drag effect in Coulomb-coupled quantum dots
412 2016-03-11 16:00  E6-2. 1st fl. #1501  Jan. Switching handedness of of chiral solitons in Z4 topological insulators
411 2016-04-08 13:30  E6-2. 1st fl. #1501  Theoretical Overview of Iron-based superconductors and its future
410 2016-03-11 13:30  E6-2. 1st fl. #1501  Topological phases of matter in nonequilibrium: Topology of the Wannier-Stark ladder
409 2022-05-25 16:00  E6-2. 1st fl. #1323 / Zoom  Uncovering New Lampposts for Dark Matter: Continuum or Conformal
408 2022-09-30 14:30  E6-2. 1st fl. #1323 & Zoom  Putting a spin on the Josephson effect file
407 2022-11-18 14:30  E6-2. 1st fl. #1323 & Zoom  Kondo cloud condensation in a highly-doped semiconductor metal file
406 2022-09-30 16:00  E6-2. 1st fl. #1323 & Zoom  Spin-orbit torque-based spintronic devices file
405 2022-11-18 16:00  E6-2. 1st fl. #1323 & Zoom  Qubits, new experimental tools for physics file
404 2022-11-09 16:00  E6-2. 1st fl. #1323  Radio Astronomy, Radio Interferometry, and Multi-wavelength Studies on Relativistic Jets
403 2022-11-10 16:00  E6-2. 1st fl. #1323  Probing the Origin of Cosmic Infrared Background and Future Prospects with SPHEREx
402 2022-06-10 16:00  E6-2. 1st fl. #1323  Fe5GeTe2의 나선형 자성특성과 자기저항의 전류밀도 의존성 연구 file
401 2022-06-10 14:30  E6-2. 1st fl. #1323  Combinatorial strategy for condensed matter physics: study on rare earth hexaborides thin films file