Research paperComputational DFTTheoreticalComputed PhononBerry curvature and shift vector effects at high-order wave mixing in biased bilayer grapheneH.K. Avetissian, H.H. Matevosyan, G.F. MkrtchianPhysical Review B·2025·10.1103/PhysRevB.111.045415·arXiv:2409.06269AbstractWe present a microscopic quantum theory for the nonlinear and non-perturbative optical response of biased bilayer graphene in bichromatic strong laser fields. Using a four-band Hamiltonian derived from ab initio calculations and structure gauge-invariant evolutionary equations, we study high-order harmonic generation and high-order wave mixing, emphasizing the roles of Berry curvature and the shift vector across the Brillouin zone. Approximate analytical trajectory calculations support the numerical results and show that Berry curvature and shift vector significantly modify the saddle-point dynamics and spectra.Read more
Biased Bernal-stacked bilayer graphene used as the simulated electronic-structure system for full-Brillouin-zone optical-response calculations.3 characterizations4 properties3 figuresSimulated Supercell DftCStudied MaterialExpand
Research paperComputational DFTTheoreticalComputed PhononBerry curvature and shift vector effects at high-order wave mixing in biased bilayer grapheneH.K. Avetissian, H.H. Matevosyan, G.F. MkrtchianPhysical Review B·2025·10.1103/PhysRevB.111.045415·arXiv:2409.06269AbstractWe present a microscopic quantum theory for the nonlinear and non-perturbative optical response of biased bilayer graphene in bichromatic strong laser fields. Using a four-band Hamiltonian derived from ab initio calculations and structure gauge-invariant evolutionary equations, we study high-order harmonic generation and high-order wave mixing, emphasizing the roles of Berry curvature and the shift vector across the Brillouin zone. Approximate analytical trajectory calculations support the numerical results and show that Berry curvature and shift vector significantly modify the saddle-point dynamics and spectra.Read more
Biased Bernal-stacked bilayer graphene used as the simulated electronic-structure system for full-Brillouin-zone optical-response calculations.3 characterizations4 properties3 figuresSimulated Supercell DftCStudied MaterialExpand
Research paperComputational DFTTheoreticalComputed PhononBerry curvature and shift vector effects at high-order wave mixing in biased bilayer grapheneH.K. Avetissian, H.H. Matevosyan, G.F. MkrtchianPhysical Review B·2025·10.1103/PhysRevB.111.045415·arXiv:2409.06269AbstractWe present a microscopic quantum theory for the nonlinear and non-perturbative optical response of biased bilayer graphene in bichromatic strong laser fields. Using a four-band Hamiltonian derived from ab initio calculations and structure gauge-invariant evolutionary equations, we study high-order harmonic generation and high-order wave mixing, emphasizing the roles of Berry curvature and the shift vector across the Brillouin zone. Approximate analytical trajectory calculations support the numerical results and show that Berry curvature and shift vector significantly modify the saddle-point dynamics and spectra.Read more
Biased Bernal-stacked bilayer graphene used as the simulated electronic-structure system for full-Brillouin-zone optical-response calculations.3 characterizations4 properties3 figuresSimulated Supercell DftCStudied MaterialExpand
Research paperComputational DFTTheoreticalComputed PhononBerry curvature and shift vector effects at high-order wave mixing in biased bilayer grapheneH.K. Avetissian, H.H. Matevosyan, G.F. MkrtchianPhysical Review B·2025·10.1103/PhysRevB.111.045415·arXiv:2409.06269AbstractWe present a microscopic quantum theory for the nonlinear and non-perturbative optical response of biased bilayer graphene in bichromatic strong laser fields. Using a four-band Hamiltonian derived from ab initio calculations and structure gauge-invariant evolutionary equations, we study high-order harmonic generation and high-order wave mixing, emphasizing the roles of Berry curvature and the shift vector across the Brillouin zone. Approximate analytical trajectory calculations support the numerical results and show that Berry curvature and shift vector significantly modify the saddle-point dynamics and spectra.Read more
Biased Bernal-stacked bilayer graphene used as the simulated electronic-structure system for full-Brillouin-zone optical-response calculations.3 characterizations4 properties3 figuresSimulated Supercell DftCStudied MaterialExpand
