50 research outputs found
Enhanced third harmonic generation from the epsilon-near-zero modes of ultrathin films
We experimentally demonstrate efficient third harmonic generation from an
indium tin oxide (ITO) nanofilm (lambda/42 thick) on a glass substrate for a
pump wavelength of 1.4 um. A conversion efficiency of 3.3x10^-6 is achieved by
exploiting the field enhancement properties of the epsilon-near-zero (ENZ) mode
with an enhancement factor of 200. This nanoscale frequency conversion method
is applicable to other plasmonic materials and reststrahlen materials in
proximity of the longitudinal optical phonon frequencies.Comment: 13 pages, 5 figure
Coherent Spin-Phonon Coupling in the Layered Ferrimagnet Mn3Si2Te6
We utilize ultrafast photoexcitation to drive coherent lattice oscillations
in the layered ferrimagnetic crystal Mn3Si2Te6, which significantly stiffen
below the magnetic ordering temperature. We suggest that this is due to an
exchange-mediated contraction of the lattice, stemming from strong
magneto-structural coupling in this material. Additionally, simulations of the
transient incoherent dynamics reveal the importance of spin relaxation channels
mediated by optical and acoustic phonon scattering. Our findings highlight the
importance of spin-lattice coupling in van der Waals magnets and a promising
route for their dynamic optical control through their intertwined electronic,
lattice, and spin degrees of freedom
Probing the Interplay between Quantum Charge Fluctuations and Magnetic Ordering in LuFe2O4
Ferroelectric and ferromagnetic materials possess spontaneous electric and
magnetic order, respectively, which can be switched by the corresponding
applied electric and magnetic fields. Multiferroics combine these properties in
a single material, providing an avenue for controlling electric polarization
with a magnetic field and magnetism with an electric field. These materials
have been intensively studied in recent years, both for their fundamental
scientific interest as well as their potential applications in a broad range of
magnetoelectric devices [1, 2, 3, 4]. However, the microscopic origins of
magnetism and ferroelectricity are quite different, and the mechanisms
producing strong coupling between them are not always well understood. Hence,
gaining a deeper understanding of magnetoelectric coupling in these materials
is the key to their rational design. Here, we use ultrafast optical
spectroscopy to show that quantum charge fluctuations can govern the interplay
between electric polarization and magnetic ordering in the charge-ordered
multiferroic LuFe2O4
Optically tuned terahertz modulator based on annealed multilayer MoS2
Controlling the propagation properties of terahertz waves is very important in terahertz technologies applied in high-speed communication. Therefore a new-type optically tuned terahertz modulator based on multilayer-MoS 2 and silicon is experimentally demonstrated. The terahertz transmission could be significantly modulated by changing the power of the pumping laser. With an annealing treatment as a p-doping method, MoS 2 on silicon demonstrates a triple enhancement of terahertz modulation depth compared with the bare silicon. This MoS 2 -based device even exhibited much higher modulation efficiency than the graphene-based device. We also analyzed the mechanism of the modulation enhancement originated from annealed MoS 2, and found that it is different from that of graphene-based device. The unique optical modulating properties of the device exhibit tremendous promise for applications in terahertz switch
Photocurrent-driven transient symmetry breaking in the Weyl semimetal TaAs
Symmetry plays a central role in conventional and topological phases of matter, making the ability to optically drive symmetry change a critical step in developing future technologies that rely on such control. Topological materials, like the newly discovered topological semimetals, are particularly sensitive to a breaking or restoring of time-reversal and crystalline symmetries, which affect both bulk and surface electronic states. While previous studies have focused on controlling symmetry via coupling to the crystal lattice, we demonstrate here an all-electronic mechanism based on photocurrent generation. Using second-harmonic generation spectroscopy as a sensitive probe of symmetry change, we observe an ultrafast breaking of time-reversal and spatial symmetries following femtosecond optical excitation in the prototypical type-I Weyl semimetal TaAs. Our results show that optically driven photocurrents can be tailored to explicitly break electronic symmetry in a generic fashion, opening up the possibility of driving phase transitions between symmetry-protected states on ultrafast time scales