CONFERENCE PROCEEDINGS
Advanced Search
Home > Proceedings > Volume 10732 > Article
Presentation
18 September 2018 Exciton magnetic polaron physics in magnetically doped colloidal nanocrystals (Conference Presentation)
William Rice
Author Affiliations +
Proceedings Volume 10732, Spintronics XI; 107320R (2018) https://doi.org/10.1117/12.2319335
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States
Abstract
Strong quantum confinement in semiconductors compresses 
the wavefunctions of band carriers to nanometer-scale volumes, significantly enhancing their interactions with dopants. In magnetically doped 
semiconductors, where paramagnetic dopants couple to band carriers via strong sp–d spin 
exchange, giant magneto-optical effects can be 
realized using few, or even single, 
impurity spins. Importantly, however, thermodynamic spin fluctuations become increasingly relevant in this few-spin limit: the statistical N^1/2 fluctuations of N 
spins are expected to generate giant effective magnetic fields 
B_eff, which dramatically impacts carrier spin dynamics, 
 even in the absence of an applied field. Here, I present measurements of both the initial and final stages of exciton magnetic polarons (EMPs) in lightly doped Cd_1-xMn_xSe colloidal nanocrystals. In the first section, I show our ultrafast spectroscopic investigations of the large B_eff in this system. At B_applied= 0T, extremely rapid 
(300–600 GHz) electron spin precession is 
observed, indicating B_eff∼15−30 T [1]. In the second part of the talk, I show our work on fully-formed EMPs. Using the highly sensitive technique of resonant photoluminescence, we directly measure the EMP binding energy to be tens of meV. Temperature- and field-dependent studies reveal that the exchange field is approximately 10 T, which agrees with theoretical estimates [2]. Taken together, the measurements of initial, ultrafast coherent dynamics and final, static formation states, give us a comprehensive picture of EMPs in doped nanocrystals. [1] W. D. Rice et al. Nature Nanotech. 11, 137 (2016). [2] W. D. Rice et al. Nano Lett. 17, 3068 (2017).
Conference Presentation
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation Download Citation
William Rice "Exciton magnetic polaron physics in magnetically doped colloidal nanocrystals (Conference Presentation)", Proc. SPIE 10732, Spintronics XI, 107320R (18 September 2018); https://doi.org/10.1117/12.2319335
ACCESS THE FULL ARTICLE
ORGANIZATIONAL
Sign in with credentials provided by your organization.
INSTITUTIONAL
Select your institution to access the SPIE Digital Library.
SELECT YOUR INSTITUTION
PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.
PERSONAL SIGN IN
No SPIE Account? Create one
PURCHASE THIS CONTENT
SUBSCRIBE TO DIGITAL LIBRARY
50 downloads per 1-year subscription
Members: $195
Non-members: $335 ADD TO CART
25 downloads per 1 - year subscription
Members: $145
Non-members: $250 ADD TO CART
PURCHASE SINGLE ARTICLE
Includes PDF, HTML & Video, when available
Members: $17.00
Non-members: $21.00 ADD TO CART
PROCEEDINGS
 PRESENTATION
WATCH
PRESENTATION SAVE TO MY LIBRARY
GET CITATION
Advertisement
Advertisement
KEYWORDS
Magnetism
Nanocrystals
Excitons
Polarons
Physics
Magnetic semiconductors
Semiconductors
RELATED CONTENT
Subscribe to Digital Library
Receive Erratum Email Alert
Back to Top