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
360 2022-03-07 16:00  E6, #1501  Climate Physics and Modelling(우리말강의)
359 2022-03-14 16:00  E6, #1501  Quantitative phase imaging and artificial intelligence: label-free 3D imaging, classification, and inference
358 2022-02-28 16:00  E6, #1501  Spin-based training of optical microscopes
357 2022-05-02 16:00  E6, #1501  What can we learn from the history of science and technology?(우리말강의)
356 2022-04-11 16:00  E6, #1501  Emergence of Statistical Mechanics in Quantum Systems
355 2022-05-23 16:00  E6, #1501  Novel electronic transport in topological van der Waals magnets
354 2022-05-09 16:00  E6, #1501  Searching for new electronic properties in correlated material flatland
353 2022-04-04- 16:00  E6, #1501  New paradigms in Quantum Field Theory
352 2022-05-16 16:00  E6, #1501  Design synthetic topological matter with atoms and lights
351 2022-05-30 16:00  E6, #1501  Light manipulation using 2D layered semiconductors
350 2015-10-23 10:30  E6, #1501  How to write a good scientific paper[Open lecture series]
349 2016-03-07 16:00  E6, 1501  Physics Colloquium : 2016 Spring file
348 2015-09-07 16:00  E6, 1501  Physics Colloquium : 2015 Fall file
347 2015-03-09 16:00  E6, 1501  Physics Colloquium : 2015 Spring file
346 2015-09-15 16:00  E6, 1501  Physics Colloquium : 2014 Fall file
345 2014-03-10 16:00  E6, 1501  Physics Colloquium : 2014 Spring file
344 2013-09-09 16:00  E6, 1501  Physics Colloquium : 2013 Fall
343 2013-03-11 16:00  E6, 1501  Physics Colloquium : 2013 Spring
342 2012-04-02 16:00  E6, 1501  A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4
341 2012-02-13 16:00  E6, 1501  Physics Colloquium : 2012 Spring