Using coherent phonons for ultrafast control of the Dirac node of SrMnSb2
Abstract
SrMnSb2 is a candidate Dirac semimetal whose electrons near the Y point have the linear dispersion and low mass of a Dirac cone. Here we demonstrate that ultrafast, 800-nm optical pulses can launch coherent phonon oscillations in Sr0.94Mn0.92Sb2, particularly an Ag mode at 4.4 THz. Through first-principles calculations of the electronic and phononic structure of SrMnSb2, we show that high-amplitude oscillations of this mode would displace the atoms in a way that transiently opens and closes a gap at the node of the Dirac cone. Furthermore, the ability to control the nodal gap on a subpicosecond timescale could create opportunities for the design and manipulation of Dirac fermions.
- Authors:
-
- Santa Clara Univ., CA (United States)
- Okinawa Inst. of Science and Technology Graduate Univ. (Japan)
- Tulane Univ., New Orleans, LA (United States)
- Tulane Univ., New Orleans, LA (United States); Pennsylvania State Univ., University Park, PA (United States)
- National Research Council of Canada, Ottawa (Canada)
- Univ. of Saskatchewan, Saskatoon, SK (Canada)
- Publication Date:
- Research Org.:
- Louisiana State Univ., Baton Rouge, LA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1611795
- Alternate Identifier(s):
- OSTI ID: 1491952
- Grant/Contract Number:
- SC0012432; DESC0012432
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 15; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials Science; Physics; Phonons; Topological materials; Density functional theory; First-principles calculations; Ultrafast pump-probe spectroscopy
Citation Formats
Weber, Chris P., Masten, Madison G., Ogloza, Thomas C., Berggren, Bryan S., Man, Michael K. L., Dani, Keshav M., Liu, Jinyu, Mao, Zhiqiang, Klug, Dennis D., Adeleke, Adebayo A., and Yao, Yansun. Using coherent phonons for ultrafast control of the Dirac node of SrMnSb2. United States: N. p., 2018.
Web. doi:10.1103/physrevb.98.155115.
Weber, Chris P., Masten, Madison G., Ogloza, Thomas C., Berggren, Bryan S., Man, Michael K. L., Dani, Keshav M., Liu, Jinyu, Mao, Zhiqiang, Klug, Dennis D., Adeleke, Adebayo A., & Yao, Yansun. Using coherent phonons for ultrafast control of the Dirac node of SrMnSb2. United States. https://doi.org/10.1103/physrevb.98.155115
Weber, Chris P., Masten, Madison G., Ogloza, Thomas C., Berggren, Bryan S., Man, Michael K. L., Dani, Keshav M., Liu, Jinyu, Mao, Zhiqiang, Klug, Dennis D., Adeleke, Adebayo A., and Yao, Yansun. Mon .
"Using coherent phonons for ultrafast control of the Dirac node of SrMnSb2". United States. https://doi.org/10.1103/physrevb.98.155115. https://www.osti.gov/servlets/purl/1611795.
@article{osti_1611795,
title = {Using coherent phonons for ultrafast control of the Dirac node of SrMnSb2},
author = {Weber, Chris P. and Masten, Madison G. and Ogloza, Thomas C. and Berggren, Bryan S. and Man, Michael K. L. and Dani, Keshav M. and Liu, Jinyu and Mao, Zhiqiang and Klug, Dennis D. and Adeleke, Adebayo A. and Yao, Yansun},
abstractNote = {SrMnSb2 is a candidate Dirac semimetal whose electrons near the Y point have the linear dispersion and low mass of a Dirac cone. Here we demonstrate that ultrafast, 800-nm optical pulses can launch coherent phonon oscillations in Sr0.94Mn0.92Sb2, particularly an Ag mode at 4.4 THz. Through first-principles calculations of the electronic and phononic structure of SrMnSb2, we show that high-amplitude oscillations of this mode would displace the atoms in a way that transiently opens and closes a gap at the node of the Dirac cone. Furthermore, the ability to control the nodal gap on a subpicosecond timescale could create opportunities for the design and manipulation of Dirac fermions.},
doi = {10.1103/physrevb.98.155115},
journal = {Physical Review B},
number = 15,
volume = 98,
place = {United States},
year = {Mon Oct 08 00:00:00 EDT 2018},
month = {Mon Oct 08 00:00:00 EDT 2018}
}
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