A Large Effective Phonon Magnetic Moment in a Dirac
Semimetal
Posted on 2020-07-10 - 13:37
We investigated the
magnetoterahertz response of the Dirac semimetal
Cd3As2 and observed a particularly low frequency
optical phonon as well as a very prominent and field-sensitive cyclotron
resonance. As the cyclotron frequency is tuned with the field to pass
through the phonon, the phonon becomes circularly polarized, as shown
by a notable splitting in its response to right- and left-hand polarized
light. This splitting can be expressed as an effective phonon magnetic
moment that is approximately 2.7 times the Bohr magneton, which is
almost 4 orders of magnitude larger than ab initio calculations predict
for phonon magnetic moments in nonmagnetic insulators. This exceedingly
large value is due to the coupling of the phonons to the cyclotron
motion and is controlled directly by the electron–phonon coupling
constant. This field-tunable circular-polarization-selective coupling
provides new functionality for nonlinear optics to create light-induced
topological phases in Dirac semimetals.
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Cheng, Bing; Schumann, T.; Wang, Youcheng; Zhang, X.; Barbalas, D.; Stemmer, S.; et al. (2020). A Large Effective Phonon Magnetic Moment in a Dirac
Semimetal. ACS Publications. Collection. https://doi.org/10.1021/acs.nanolett.0c01983
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AUTHORS (7)
BC
Bing Cheng
TS
T. Schumann
YW
Youcheng Wang
XZ
X. Zhang
DB
D. Barbalas
SS
S. Stemmer
NA
N. P. Armitage
KEYWORDS
light-induced topological phasesBohr magnetonnonmagnetic insulatorsDirac semimetal Cd 3nonlinear opticsDirac semimetalsmagnetoterahertz responseab initio calculations4 ordersDirac Semimetalfield-tunable circular-polarization...cyclotron motionphononcyclotron frequencyfield-sensitive cyclotron resonance2.7 times