Research Repository

See what's under the surface


Optical excitation of single-and multi-mode magnetization precession in Galfenol nanolayers (2019)
Journal Article
Scherbakov, A., Danilov, A., Godejohann, F., Linnik, T., Glavin, B., Shelukhin, L., …Bayer, M. (in press). Optical excitation of single-and multi-mode magnetization precession in Galfenol nanolayers. Physical Review Applied,

We demonstrate a variety of precessional responses of the magnetization to ultrafast optical excitation in nanolayers of Galfenol (Fe,Ga), which is a ferromagnetic material with large saturation magnetization and enhanced magnetostriction. The partic... Read More

Ultrafast insulator-metal transition in VO2 nanostructures assisted by picosecond strain pulses (2019)
Journal Article
Mogunov, I. A., Fernández, F., Lysenko, S., Kent, A., Scherbakov, A., Kalashnikova, A., & Akimov, A. (2019). Ultrafast insulator-metal transition in VO2 nanostructures assisted by picosecond strain pulses. Physical Review Applied, 11(1), doi:10.1103/physrevapplied.11.014054

Strain engineering is a powerful technology that exploits the stationary external or internal stress of specific spatial distribution for controlling the fundamental properties of condensed materials and nanostructures. This advanced technique modula... Read More

A high electron mobility phonotransistor (2018)
Journal Article
Poyser, C. L., Li, L. H., Campion, R. P., Akimov, A. V., Linfield, E. H., Davies, A. G., …Kent, A. J. (2018). A high electron mobility phonotransistor. Communications Physics, 1, (1-7). doi:10.1038/s42005-018-0059-7. ISSN 2399-3650

Acoustoelectric devices convert acoustic energy to electrical energy and vice versa. Devices working at much higher acoustic frequencies than those currently available have potential scientific and technological applications, e.g.: as detectors in ph... Read More

Coherent acoustic phonons in van der Waals nanolayers and heterostructures (2018)
Journal Article
Greener, J. D., Akimov, A. V., Gusev, V., Kudrynskyi, Z., Beton, P. H., Kovalyuk, Z. D., …Patanè, A. (2018). Coherent acoustic phonons in van der Waals nanolayers and heterostructures. Physical Review B, 98(7), doi:10.1103/PhysRevB.98.075408. ISSN 2469-9950

Terahertz (THz) and sub-THz coherent acoustic phonons have been successfully used as probes of various quantum systems. Since their wavelength is in the nanometer range, they can probe nanostructures buried below a surface with nanometer resolution a... Read More

Photoelastic properties of zinc-blende (AlGa)N in the UV: picosecond ultrasonic studies (2018)
Journal Article
Whale, J., Akimov, A. V., Novikov, S. V., Mellor, C. J., & Kent, A. J. (2018). Photoelastic properties of zinc-blende (AlGa)N in the UV: picosecond ultrasonic studies. Physical Review Materials, 2(3), doi:10.1103/PhysRevMaterials.2.034606. ISSN 2475-9953

Picosecond ultrasonics was used to study the photoelastic properties of zinc-blende (cubic) c-AlₓGa₁₋ₓN with x around 0.5 The velocities for longitudinal sound in the alloys were measured using ultrafast UV pump-probe experiments with (Al... Read More

Generation of a localised microwave magnetic field by coherent phonons in a ferromagnetic grating (2018)
Journal Article
Salasyuk, A., Rudkovskaya, A., Danilov, A., Glavin, B., Kukhtaruk, S., Wang, M., …Scherbakov, A. (2018). Generation of a localised microwave magnetic field by coherent phonons in a ferromagnetic grating. Physical Review B, 97(6), doi:10.1103/PhysRevB.97.060404. ISSN 2469-9950

A high-amplitude microwave magnetic field localized at the nanoscale is a desirable tool for various applications within the rapidly developing field of nanomagnetism. Here, we drive magnetization precession by coherent phonons in a metal ferromagnet... Read More

Phonon spectroscopy with chirped shear and compressive acoustic pulses (2017)
Journal Article
Poyser, C. L., York, W., Srikanthreddy, D., Glavin, B., Linnik, T., Campion, R., …Kent, A. (in press). Phonon spectroscopy with chirped shear and compressive acoustic pulses. Physical Review Letters, 119, doi:10.1103/PhysRevLett.119.255502. ISSN 0031-9007

Picosecond duration compressive and shear phonon wave packets injected into (311) GaAs slabs transform after propagation through ∼1  mm into chirped acoustic pulses with a frequency increasing in time due to phonon dispersion. By probing the temporal... Read More

Acousto-optical nanoscopy of buried photonic nanostructures (2017)
Journal Article
Czerniuk, T., Schneider, C., Kamp, M., Höfling, S., Glavin, B., Yakovlev, D., …Bayer, M. (2017). Acousto-optical nanoscopy of buried photonic nanostructures. Optica, 4(6), doi:10.1364/OPTICA.4.000588. ISSN 2334-2536

We develop a nanoscopy method with in-depth resolution for layered photonic devices. Photonics often requires tailored light field distributions for the optical modes used, and an exact knowledge of the geometry of a device is crucial to assess its p... Read More

The effect of dynamical compressive and shear strain on magnetic anisotropy in a low symmetry ferromagnetic film (2017)
Journal Article
Linnik, T., Kats, V., Jäger, J., Salasyuk, A., Yakovlev, D., Rushforth, A., …Scherbakov, A. (2017). The effect of dynamical compressive and shear strain on magnetic anisotropy in a low symmetry ferromagnetic film. Physica Scripta, 92(5), doi:10.1088/1402-4896/aa6943. ISSN 0031-8949

Dynamical strain generated upon excitation of a metallic film by a femtosecond laser pulse may become a versatile tool enabling control of magnetic state of thin _lms and nanostructures via inverse magnetostriction on a picosecond time scale. Here we... Read More

Picosecond control of quantum dot laser emission by coherent phonons (2017)
Journal Article
Czerniuk, T., Wigger, D., Akimov, A., Schneider, C., Kamp, M., Höfling, S., …Bayer, M. (2017). Picosecond control of quantum dot laser emission by coherent phonons. Physical Review Letters, 118(13), doi:10.1103/PhysRevLett.118.133901. ISSN 0031-9007

A picosecond acoustic pulse can be used to control the lasing emission from semiconductor nanostructures by shifting their electronic transitions. When the active medium, here an ensemble of (In,Ga)As quantum dots, is shifted into or out of resonance... Read More

Picosecond acoustics in single quantum wells of cubic GaN/(Al,Ga)N (2017)
Journal Article
Czerniuk, T., Ehrlich, T., Wecker, T., As, D., Yakovlev, D., Akimov, A., & Bayer, M. (2017). Picosecond acoustics in single quantum wells of cubic GaN/(Al,Ga)N. Physical Review Applied, 7(1), doi:10.1103/PhysRevApplied.7.014006. ISSN 2331-7019

A picosecond acoustic pulse is used to study the photoelastic interaction in single zinc-blende GaN/AlxGa1−xN quantum wells. We use an optical time-resolved pump-probe setup and demonstrate that tuning the photon energy to the quantum well’s lowest e... Read More

Heterodyne mixing of millimetre electromagnetic waves and sub-THz sound in a semiconductor device (2016)
Journal Article
Heywood, S. L., Glavin, B. A., Beardsley, R., Akimov, A. V., Carr, M. W., Norman, J., …Kent, A. J. (in press). Heterodyne mixing of millimetre electromagnetic waves and sub-THz sound in a semiconductor device. Scientific Reports, 6, doi:10.1038/srep30396. ISSN 2045-2322

We demonstrate heterodyne mixing of a 94 GHz millimetre wave photonic signal, supplied by a Gunn diode oscillator, with coherent acoustic waves of frequency ~ 100 GHz, generated by pulsed laser excitation of a semiconductor surface. The mixing takes... Read More

Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films (2016)
Journal Article
Kats, V., Linnik, T., Salasyuk, A., Rushforth, A., Wang, M., Wadley, P., …Scherbakov, A. (2016). Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films. Physical Review B, 93(21), doi:10.1103/PhysRevB.93.214422. ISSN 2469-9950

Ultrafast optical excitation of a metal ferromagnetic film results in a modification of the magnetocrystalline anisotropy and induces the magnetization precession. We consider two main contributions to these processes: an effect of noncoherent phonon... Read More

Nanomechanical probing of the layer/substrate interface of an exfoliated InSe sheet on sapphire (2016)
Journal Article
Beardsley, R., Akimov, A. V., Greener, J. D., Mudd, G. W., Sandeep, S., Kudrynskyi, Z. R., …Kent, A. J. (in press). Nanomechanical probing of the layer/substrate interface of an exfoliated InSe sheet on sapphire. Scientific Reports, 6, doi:10.1038/srep26970. ISSN 2045-2322

Van der Waals (vdW) layered crystals and heterostructures have attracted substantial interest for potential applications in a wide range of emerging technologies. An important, but often overlooked, consideration in the development of implementable d... Read More

Coherent phonon optics in a chip with an electrically controlled active device (2015)
Journal Article
Akimov, A., Poyser, C. L., Kent, A. J., & CAMPION, R. (2015). Coherent phonon optics in a chip with an electrically controlled active device. Scientific Reports, 5, doi:10.1038/srep08279

Phonon optics concerns operations with high-frequency acoustic waves in solid media in a similar way to how traditional optics operates with the light beams (i.e. photons). Phonon optics experiments with coherent terahertz and sub-terahertz phonons p... Read More

High-frequency acousto-optic effects in Bragg reflectors (2014)
Journal Article
Farmer, D., Akimov, A. V., Gippius, N., Bailey, J., Sharp, J. S., & Kent, A. (2014). High-frequency acousto-optic effects in Bragg reflectors. Optics Express, 22(12), 15218-15231. doi:10.1364/OE.22.015218

Picosecond acoustic interferometry was used to study the acousto-optic properties of a distributed Bragg reflector (DBR) manufactured from two immiscible polymers (cellulose acetate and polyvinylcarbyzole). Picosecond strain pulses were injected into... Read More