Valley and Zeeman Splittings in Multilayer Epitaxial Graphene Revealed by Circular Polarization Resolved Magneto-infrared Spectroscopy
Abstract
Circular-polarization-resolved magneto-infrared studies of multilayer epitaxial graphene (MEG) are performed using tunable quantum cascade lasers in high magnetic fields up to 17.5 T. Landau level (LL) transitions in the monolayer and bilayer graphene inclusions of MEG are resolved, and considerable electron–hole asymmetry is observed in the extracted electronic band structure. For monolayer graphene, a four-fold splitting of the $$n$$ = 0 to $$n$$ = 1 LL transition is evidenced and attributed to the lifting of the valley and spin degeneracy of the zeroth LL and the broken electron–hole symmetry. The magnetic field dependence of the splitting further reveals its possible mechanisms. The best fit to experimental data yields effective $$g$$-factors, $$g^*_{vs}$$ = 6.7 and $$g^*_{ZS}$$ = 4.8, for the valley and Zeeman splittings, respectively.
- Authors:
-
[2]
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Georgia Inst. of Technology, Atlanta, GA (United States)
- Univ. of Florida, Gainesville, FL (United States)
- Publication Date:
- Research Org.:
- Georgia Institute of Technology, Atlanta, GA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1559443
- Grant/Contract Number:
- FG02-07ER46451
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nano Letters
- Additional Journal Information:
- Related Information: See Supporting Information for the details of the experiment setup and the multilayer epitaxial graphene characterization. This material is available free of charge via the Internet at http://pubs.acs.org/.; Journal ID: ISSN 1530-6984
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; epitaxial graphene, symmetry breaking states, Landau levels, magneto-infrared spectroscopy
Citation Formats
Jiang, Yuxuan, Lu, Zhengguang, Gigliotti, Jamey, Rustagi, Avinash, Chen, Li, Berger, Claire, de Heer, Walter A., Stanton, Christopher J., Smirnov, Dmitry, and Jiang, Zhigang. Valley and Zeeman Splittings in Multilayer Epitaxial Graphene Revealed by Circular Polarization Resolved Magneto-infrared Spectroscopy. United States: N. p., 2019.
Web. doi:10.1021/acs.nanolett.9b02505.
Jiang, Yuxuan, Lu, Zhengguang, Gigliotti, Jamey, Rustagi, Avinash, Chen, Li, Berger, Claire, de Heer, Walter A., Stanton, Christopher J., Smirnov, Dmitry, & Jiang, Zhigang. Valley and Zeeman Splittings in Multilayer Epitaxial Graphene Revealed by Circular Polarization Resolved Magneto-infrared Spectroscopy. United States. https://doi.org/10.1021/acs.nanolett.9b02505
Jiang, Yuxuan, Lu, Zhengguang, Gigliotti, Jamey, Rustagi, Avinash, Chen, Li, Berger, Claire, de Heer, Walter A., Stanton, Christopher J., Smirnov, Dmitry, and Jiang, Zhigang. Fri .
"Valley and Zeeman Splittings in Multilayer Epitaxial Graphene Revealed by Circular Polarization Resolved Magneto-infrared Spectroscopy". United States. https://doi.org/10.1021/acs.nanolett.9b02505. https://www.osti.gov/servlets/purl/1559443.
@article{osti_1559443,
title = {Valley and Zeeman Splittings in Multilayer Epitaxial Graphene Revealed by Circular Polarization Resolved Magneto-infrared Spectroscopy},
author = {Jiang, Yuxuan and Lu, Zhengguang and Gigliotti, Jamey and Rustagi, Avinash and Chen, Li and Berger, Claire and de Heer, Walter A. and Stanton, Christopher J. and Smirnov, Dmitry and Jiang, Zhigang},
abstractNote = {Circular-polarization-resolved magneto-infrared studies of multilayer epitaxial graphene (MEG) are performed using tunable quantum cascade lasers in high magnetic fields up to 17.5 T. Landau level (LL) transitions in the monolayer and bilayer graphene inclusions of MEG are resolved, and considerable electron–hole asymmetry is observed in the extracted electronic band structure. For monolayer graphene, a four-fold splitting of the $n$ = 0 to $n$ = 1 LL transition is evidenced and attributed to the lifting of the valley and spin degeneracy of the zeroth LL and the broken electron–hole symmetry. The magnetic field dependence of the splitting further reveals its possible mechanisms. The best fit to experimental data yields effective $g$-factors, $g^*_{vs}$ = 6.7 and $g^*_{ZS}$ = 4.8, for the valley and Zeeman splittings, respectively.},
doi = {10.1021/acs.nanolett.9b02505},
journal = {Nano Letters},
number = ,
volume = ,
place = {United States},
year = {Fri Aug 30 00:00:00 EDT 2019},
month = {Fri Aug 30 00:00:00 EDT 2019}
}
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