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Coherent phonons in a $Bi_2Se_3$ film generated by an intense single-cycle THz pulse | | A. A. Melnikov
; K. N. Boldyrev
; Yu. G. Selivanov
; V. P. Martovitskii
; S. V. Chekalin
; E. A. Ryabov
; | | Date: |
10 Aug 2017 | | Abstract: | We report an observation of coherent phonons of $E_g^1$, $E_u^1$, $E_g^2$ and
$A_{1g}^2$ symmetry generated in a single-crystal film of $Bi_2Se_3$ by an
intense single-cycle THz pulse. The atomic vibrations reveal themselves through
periodic anisotropic modulation of the refractive index of the film. The
largest signal is detected at the frequency of 4.05 THz that corresponds to the
$E_g^2$ mode. The generation of $E_g^2$ phonons is interpreted as resonant
excitation of the Raman mode by the second harmonic of THz-driven nonlinear
$E_u^1$ oscillator, the fundamental frequency of which (2.05 THz) is
approximately half that of $E_g^2$. The origin of nonlinearity in this case is
cubic lattice anharmonicity, while generation of $E_g^1$ (1.1 THz) and
$A_{1g}^2$ (5.3 THz) phonons is a manifestation of quartic anharmonicity that
provides the frequency combination $2Omega(E_u^1) =Omega(A_{1g}^2) -
Omega(E_g^1)$. | | Source: | arXiv, 1708.3318 | | Services: | Forum | Review | PDF | Favorites | |
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