Using coherent phonons for ultrafast control of the Dirac node of SrMnSb2
Journal Article
·
· Physical Review B
- 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)
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.
- Research Organization:
- Louisiana State Univ., Baton Rouge, LA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0012432; DESC0012432
- OSTI ID:
- 1611795
- Alternate ID(s):
- OSTI ID: 1491952
- Journal Information:
- Physical Review B, Vol. 98, Issue 15; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Cited by: 12 works
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