Bulletin of the American Physical Society
APS March Meeting 2020
Volume 65, Number 1
Monday–Friday, March 2–6, 2020; Denver, Colorado
Session S43: Computational Design and Discovery of Novel Materials IV: 2D and Layered Materials
11:15 AM–1:51 PM,
Thursday, March 5, 2020
Room: 702
Sponsoring
Units:
DCOMP DMP
Chair: Kai-Ming Ho, Iowa State University
Abstract: S43.00003 : Giant polarization charge density at ScN/GaN interfaces*
View Presentation
Abstract
Presenter:
Nicholas Adamski
(Department of Electrical and Computer Engineering, University of California, Santa Barbara)
Authors:
Nicholas Adamski
(Department of Electrical and Computer Engineering, University of California, Santa Barbara)
Cyrus Dreyer
(Department of Physics and Astronomy, Stony Brook University)
Chris Van de Walle
(Materials Department, University of California, Santa Barbara)
GaN is a wurtzite semiconductor that exhibits a large spontaneous polarization, while ScN is a semiconducting nitride that takes the nonpolar rocksalt crystal structure. Due to small lattice mismatch between ScN and GaN, it is possible to create a polar-nonpolar interface between the two materials.
Using density functional theory and the Berry-phase method, we examine the formal polarization of rocksalt ScN along the [111] direction, finding a polarization discontinuity of -1.358 Cm-2. We confirm this finding with explicit ScN/GaN supercell calculations. The polarization discontinuity causes a high-density electron gas to form on the N-polar GaN/ScN interface, and a hole gas to form on the Ga-polar interface, with carrier concentrations up to 8.5 x 1014 cm-2. The large polarization difference and low lattice mismatch make ScN a promising material for integration with III-nitride electronic and optoelectronic devices.
*This work is supported by AFOSR.
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2023 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
1 Research Road, Ridge, NY 11961-2701
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700