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Title: Using coherent phonons for ultrafast control of the Dirac node of SrMnSb2

Journal Article · · Physical Review B
 [1];  [1];  [1];  [1];  [2];  [2];  [3];  [4];  [5];  [6];  [6]
  1. Santa Clara Univ., CA (United States)
  2. Okinawa Inst. of Science and Technology Graduate Univ. (Japan)
  3. Tulane Univ., New Orleans, LA (United States)
  4. Tulane Univ., New Orleans, LA (United States); Pennsylvania State Univ., University Park, PA (United States)
  5. National Research Council of Canada, Ottawa (Canada)
  6. 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
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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