| Autor: |
Shcheblanov, N. S., Povarnitsyn, M. E., Terekhin, P. N., Guizard, S., Couairon, A. |
| Rok vydání: |
2017 |
| Předmět: |
|
| Zdroj: |
Phys. Rev. A 96, 063410 (2017) |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevA.96.063410 |
| Popis: |
We provide a nonperturbative theory for photoionization of transparent solids. By applying a particular steepest-descent method, we derive analytical expressions for the photoionization rate within the two-band structure model, which consistently account for the $selection$ $rules$ related to the parity of the number of absorbed photons ($odd$ or $even$). We demonstrate the crucial role of the interference of the transition amplitudes (saddle-points), which in the semi-classical limit, can be interpreted in terms of interfering quantum trajectories. Keldysh's foundational work of laser physics [Sov. Phys. JETP 20, 1307 (1965)] disregarded this interference, resulting in the violation of $selection$ $rules$. We provide an improved Keldysh photoionization theory and show its excellent agreement with measurements for the frequency dependence of the two-photon absorption and nonlinear refractive index coefficients in dielectrics. |
| Databáze: |
arXiv |
| Externí odkaz: |
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