visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
장소 E6-2. #1323(1st fl.) 
일시 May 24 (Tue) 4 PM 
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 일시 장소 연사 제목
공지 Sep.22 2022  E6-1 #1323    2022 가을학기 응집물리 및 광학 세미나 전체 일정
421 #1323(E6-2. 1st fl.)  Jul. 10th (Mon), 4pm  Dr. Duk Young Kim Los Alamos National Laboratory  “Intertwined Orders in a Heavy-fermion metal” file
420 RM. 1323, E6-2    Spring 2019: Physics Seminar Serises file
419 2019/09/18 - 12/5  Seminar Room #1323  Prof. David Schuster and etc.  Fall 2019: Physics Seminar Serises file
418 2019/09/02 - 12/09  Seminar Room 1501  이호성 박사 (한국표준과학연구원) and etc.  Fall 2019: Physics Colloquium file
417 10AM, 29th Mar. / 13:30 PM, 30th Mar.  E6 #1501/zoom, E6 #2502/zoom  Dr. RYO HANAI (APCTP)  Non-reciprocal phase transitions file
416 10AM, 31th Mar.  E6 #1501/zoom  Dr. Samuel Begg (APCTP)  Weiss fields for Quantum Spin Dynamics file
415 2. 28(월),16:00  E6, #1501  김동규교수 (KAIST 물리학과)  Spin-based training of optical microscopes
414 2009/02/23-05/04  E6, 1501  안종현교수(성균관대) 외  Physics Colloquium : 2009 Spring file
413 2009/09/07-11/30  E6, 1501  이주영박사(KIAS) 외  Physics Colloquium : 2009 Fall file
412 2009/10/21, 4PM  E6, 1501  최석봉교수(서울대)  Interdimensional Universality of Dynamic Interfaces
411 2010/02/08-05/03  E6, 1501  최인수교수(서울대) 외  Physics Ciolloquium : 2010 Spring file
410 2010/02/14-05/09  E6, 1501  황철주(주성엔지니어링 사장) 외  Physics Colloquium - 2011 Spring file
409 2010/09/06-12/06  E6, 1501  조호진기자(조선일보) 외  Physics Colloquium : 2010 Fall file
408 2011/05/16, 4PM  E6, 1501  서민교교수(KAIST)  Photonics with surface plasmon polaritons
407 2011/09/03-12/06  E6, 1501  김용균교수(한양대) 외  Physics Colloquium : 2011 Fall file
406 2012/02/13-05/14  E6, 1501  Kenji Ohmori (Photo-Molecular Science, IMS)  Physics Colloquium : 2012 Spring
405 2012/04/02, 4PM  E6, 1501  Yong Hee Jeong  A new route to ferroelectricity in magnetic spinels: a case of Co2MnO4
404 2013/03/11-06/10  E6, 1501  강명수교수(KAIST) 외  Physics Colloquium : 2013 Spring
403 2013/09/09-12/09  E6, 1501  박혁규교수(부산대) 외  Physics Colloquium : 2013 Fall
402 2014/03/10-06/09  E6, 1501  신용일교수(서울대)  Physics Colloquium : 2014 Spring file