Monolayer Vanadium‐Doped Tungsten Disulfide: A Room‐Temperature Dilute Magnetic Semiconductor
Abstract
Dilute magnetic semiconductors (DMS), achieved through substitutional doping of spin‐polarized transition metals into semiconducting systems, enable experimental modulation of spin dynamics in ways that hold great promise for novel magneto–electric or magneto–optical devices, especially for two‐dimensional (2D) systems such as transition metal dichalcogenides that accentuate interactions and activate valley degrees of freedom. Practical applications of 2D magnetism will likely require room‐temperature operation, air stability, and (for magnetic semiconductors) the ability to achieve optimal doping levels without dopant aggregation. Here, room‐temperature ferromagnetic order obtained in semiconducting vanadium‐doped tungsten disulfide monolayers produced by a reliable single‐step film sulfidation method across an exceptionally wide range of vanadium concentrations, up to 12 at% with minimal dopant aggregation, is described. These monolayers develop p‐type transport as a function of vanadium incorporation and rapidly reach ambipolarity. Ferromagnetism peaks at an intermediate vanadium concentration of ~2 at% and decreases for higher concentrations, which is consistent with quenching due to orbital hybridization at closer vanadium–vanadium spacings, as supported by transmission electron microscopy, magnetometry, and first‐principles calculations. Room‐temperature 2D‐DMS provide a new component to expand the functional scope of van der Waals heterostructures and bring semiconducting magnetic 2D heterostructures into the realm of practical application.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 09, 2020
- Source ID
- 10.1002/advs.202001174
Entities
People
- Amritanand Sebastian
- Ana Laura Elias
- Boyang Zheng
- David H Olson
- Fu Zhang
- Kazunori Fujisawa
- Leixin Miao
- Manh‐huong Phan
- Mauricio Terrones
- Mingzu Liu
- Nasim Alem
- Patrick E Hopkins
- Rahul Pendurthi
- Saptarshi Das
- Tianyi Zhang
- Valery Ortiz Jimenez
- Vijaysankar Kalappattil
- Vincent H. Crespi
- Yen Thi Hai Pham
- Yu Lei
- Yuanxi Wang
Organizations
- Air Force Office of Scientific Research
- Binghamton University
- National Science Foundation
- Pennsylvania State University
- Shinshu University
- United States Department of Energy
- University of South Florida
- University of Virginia