Journal ArticleDOI
Solid-state harmonics beyond the atomic limit
Georges Ndabashimiye,Shambhu Ghimire,Mengxi Wu,Dana A. Browne,Kenneth J. Schafer,Mette B. Gaarde,David A. Reis,David A. Reis +7 more
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TLDR
It is found that the high harmonic generation spectra from the rare-gas solids exhibit multiple plateaus extending well beyond the atomic limit of the corresponding gas-phase harmonics measured under similar conditions, suggesting the importance of electron–hole recollision in these solids.Abstract:
Strong-field laser excitation of solids can produce extremely nonlinear electronic and optical behaviour. As recently demonstrated, this includes the generation of high harmonics extending into the vacuum-ultraviolet and extreme-ultraviolet regions of the electromagnetic spectrum. High harmonic generation is shown to occur fundamentally differently in solids and in dilute atomic gases. How the microscopic mechanisms in the solid and the gas differ remains a topic of intense debate. Here we report a direct comparison of high harmonic generation in the solid and gas phases of argon and krypton. Owing to the weak van der Waals interaction, rare (noble)-gas solids are a near-ideal medium in which to study the role of high density and periodicity in the generation process. We find that the high harmonic generation spectra from the rare-gas solids exhibit multiple plateaus extending well beyond the atomic limit of the corresponding gas-phase harmonics measured under similar conditions. The appearance of multiple plateaus indicates strong interband couplings involving multiple single-particle bands. We also compare the dependence of the solid and gas harmonic yield on laser ellipticity and find that they are similar, suggesting the importance of electron-hole recollision in these solids. This implies that gas-phase methods such as polarization gating for attosecond pulse generation and orbital tomography could be realized in solids.read more
Citations
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High-harmonic generation in graphene enhanced by elliptically polarized light excitation
TL;DR: The observation of up to ninth-order harmonics in graphene excited by mid-infrared laser pulses at room temperature opens up the possibility of investigating strong-field and ultrafast dynamics and nonlinear behavior of massless Dirac fermions.
Journal ArticleDOI
High-harmonic generation from an atomically thin semiconductor
Hanzhe Liu,Hanzhe Liu,Yilei Li,Yilei Li,Yong Sing You,Shambhu Ghimire,Tony F. Heinz,Tony F. Heinz,David A. Reis,David A. Reis +9 more
TL;DR: In this paper, the authors demonstrate non-perturbative high-harmonic generation from a monolayer MoS2 crystal, with even and odd harmonics extending to the 13th order.
Journal ArticleDOI
High-harmonic generation from solids
Shambhu Ghimire,David A. Reis +1 more
TL;DR: In this article, a review of recent efforts at understanding and characterizing high-order harmonics from solid-state materials is presented, which can be used to probe driven ultrafast dynamics and its prospects for novel, compact short-wavelength light sources.
Journal ArticleDOI
Anisotropic high-harmonic generation in bulk crystals
TL;DR: In this article, the authors demonstrate that high-harmonic generation in solids is sensitive to interatomic bonding and show that harmonic efficiency is enhanced for semi-classical electron trajectories that connect (avoid) neighbouring atomic sites in the crystal.
Journal ArticleDOI
Diffraction and microscopy with attosecond electron pulse trains
TL;DR: In this article, a beam of 70-keV electrons at 4.5-pm de Broglie wavelength is modulated by the electric field of laser cycles into a sequence of electron pulses with sub-optical-cycle duration.
References
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TL;DR: It is demonstrated that the full three-dimensional structure of a single orbital can be imaged by a seemingly unlikely technique, using high harmonics generated from intense femtosecond laser pulses focused on aligned molecules.
Journal ArticleDOI
Observation of high-order harmonic generation in a bulk crystal
Shambhu Ghimire,Anthony DiChiara,Emily Sistrunk,Pierre Agostini,Louis F. DiMauro,David A. Reis,David A. Reis +6 more
TL;DR: In this article, high-order harmonic generation is observed in a bulk crystalline solid with important implications for attosecond science, where the host medium for this interaction is typically a gas.