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Article
Open AccessHighly efficient THz four-wave mixing in doped silicon
Third-order non-linearities are important because they allow control over light pulses in ubiquitous high-quality centro-symmetric materials like silicon and silica. Degenerate four-wave mixing provides a dire...
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Article
Open AccessThe multi-photon induced Fano effect
The ordinary Fano effect occurs in many-electron atoms and requires an autoionizing state. With such a state, photo-ionization may proceed via pathways that interfere, and the characteristic asymmetric resonan...
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Article
Open AccessTopological phases of a dimerized Fermi–Hubbard model for semiconductor nano-lattices
Motivated by recent advances in fabricating artificial lattices in semiconductors and their promise for quantum simulation of topological materials, we study the one-dimensional dimerized Fermi–Hubbard model. ...
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Article
Open AccessGiant non-linear susceptibility of hydrogenic donors in silicon and germanium
Implicit summation is a technique for the conversion of sums over intermediate states in multiphoton absorption and the high-order susceptibility in hydrogen into simple integrals. Here, we derive the equivale...
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Article
Giant multiphoton absorption for THz resonances in silicon hydrogenic donors
The absorption of multiple photons when there is no resonant intermediate state is a well-known nonlinear process in atomic vapours, dyes and semiconductors. The N-photon absorption (NPA) rate for donors in semic...
