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)
594 2015-07-16 16:00    Next-generation ultrafast laser technology for nonlinear optics and strong-field physics
593 2015-07-16 16:00    KAIST Physics Distinguished Lecture
592 2015-07-23 13:30    Enhanced ZnO based UV photonics and related applications file
591 2015-08-03 10:30    Axion Search
590 2015-08-04 11:00    Propagation of ultrasound through two- and three-dimensional strongly scattering media
589 2015-09-07 15:00    Advanced Optical Materials and Devices at NRL
588 2015-09-07 16:00    Physics Colloquium : 2015 Fall file
587 2015-09-14 14:00    Ultrafast X-ray Studies on Dynamics Matter in Extreme Conditions
586 2015-09-15 16:00    Physics Colloquium : 2014 Fall file
585 2015-10-14 18:00    인터스텔라 영화 속의 물리 file
584 2015-10-15 10:00    Development of Large-Bore, High Field Magnets at the NHMFL
583 2015-10-16 15:00    High Magnetic Fields to Probe the sub-eV range of Particle/Astroparticle Physics - From the OSQAR experiments at CERN up to new perspectives at LNCMI-Grenoble
582 2015-10-16 16:00    Fluctuations of entropy production in partially masked electric circuits
581 2015-10-23 10:30    How to write a good scientific paper[Open lecture series]
580 2015-10-23 15:00    Development of a Rogowski Coil as a new beam position monitor
579 2015-11-06 16:30    Topological Dirac line nodes in centrosymmetric semimetals
578 2015-11-10 16:00    Rapid heating of matter using high power lasers
577 2015-11-19 16:00    Emergent Collective Phenomena and Functions at Reduced Dimensions
576 2015-11-23 13:30    What's Beyond the Standard Model? Lessons from Run I and what might come in Run II
575 2015-11-24 16:00    Topology-based understanding of spin dynamics in inhomogeneously magnetized systems