A5016700216- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Characterization and Applications of Magnetic Nanoparticles
- Geomagnetism and Paleomagnetism Studies
- Quantum optics and atomic interactions
- Advanced MRI Techniques and Applications
- Magnetic Field Sensors Techniques
- Luminescence Properties of Advanced Materials
- Superconducting Materials and Applications
- High-pressure geophysics and materials
- Dark Matter and Cosmic Phenomena
- X-ray Diffraction in Crystallography
- Advanced Chemical Physics Studies
- Strong Light-Matter Interactions
- Iron oxide chemistry and applications
- Radiation Detection and Scintillator Technologies
- Nuclear materials and radiation effects
- Magneto-Optical Properties and Applications
- Magnetic Properties of Alloys
- Fusion materials and technologies
- Electric Motor Design and Analysis
- Optical and Acousto-Optic Technologies
- Crystallography and Radiation Phenomena
- Thermal Radiation and Cooling Technologies
Physikalisch-Technische Bundesanstalt
2019-2025
Lomonosov Moscow State University
2023
University of Fribourg
2012-2021
St Petersburg University
2000-2006
Sokhumi State University
2002
Pskov State University
1993
Kirov State Medical Academy
1991
D.V.Efremov Institute of Electrophysical Apparatus (Russia)
1976-1979
Kazan Federal University
1978-1979
Abstract Ultralight bosons such as axion-like particles are viable candidates for dark matter. They can form stable, macroscopic field configurations in the of topological defects that could concentrate matter density into many distinct, compact spatial regions small compared with Galaxy but much larger than Earth. Here we report results search transient signals from domain walls by using global network optical magnetometers exotic (GNOME) physics searches. We data, consisting correlated...
Abstract Objective: Mapping the myomagnetic field of a straight and easily accessible muscle after electrical stimulation using triaxial optically pumped magnetometers (OPMs) to assess potential benefits for magnetomyography (MMG). 

Approach: Six OPMs were arranged in two rows with three sensors each along abductor digiti minimi (ADM) muscle. The upper row was inclined by 45° respect lower all aligned closely skin surface without direct contact. Then, electromagnetic...
He: Vortices and turbulence PACS 61.46.Km -Structure of nanowires nanorods (long, free or loosely attached, quantum wires rods, but not gate-isolated embedded wires)Abstract -We demonstrate that laser ablation a gold target immersed in superfluid normal fluid helium leads to the formation elongated nano-fragments.In phase these nano-fragments aggregate into filaments with extremely large aspect ratios displaying metallic electric conductivity.We attribute this unusual structure coalescence...
Magnetic nanoparticles (MNP) offer a large variety of promising applications in medicine thanks to their exciting physical properties, e.g., magnetic hyperthermia and drug targeting. For these applications, it is crucial quantify the amount MNP specific binding state. This information can be obtained by means magnetorelaxometry (MRX), where relaxation previously aligned moments measured. Current MRX with optically pumped magnetometers (OPM) limited OPM recovery time after shut-off external...
The Global Network of Optical Magnetometers to search for Exotic physics (GNOME) is a network geographically separated, time-synchronized, optically pumped atomic magnetometers that being used correlated transient signals heralding exotic physics. GNOME sensitive nuclear- and electron-spin couplings fields from astrophysical sources such as compact dark-matter objects (for example, axion stars domain walls). Properties the sensors sensitivity, bandwidth, noise characteristics are studied in...
Abstract While magnetomyography (MMG) using optically pumped magnetometers (OPMs) is a promising method for non-invasive investigation of the neuromuscular system, it has almost exclusively been performed in magnetically shielded rooms (MSRs) to date. MSRs provide extraordinary conditions biomagnetic measurements but limit widespread adoption measurement methods due high costs and extensive infrastructure. In this work, we address issue by exploring feasibility mobile OPM-MMG setup...
We have performed quantitative measurements of the variation on-resonance absorption coefficients ${\ensuremath{\kappa}}_{0}$ four hyperfine components Cs ${D}_{1}$ transition as a function laser power $P$, for pumping with linearly and circularly polarized light. Sublevel populations derived from rate equations assuming isotropic population relaxation (at ${\ensuremath{\gamma}}_{1}$) yield algebraic ${\ensuremath{\kappa}}_{0}(P)$ dependences that do not reproduce experimental findings vapor...
We introduce a Magnetic Particle Imaging Susceptometer (MPIS) that uses high-sensitivity atomic magnetometer (AM) for recording the spatial distribution of fluid-suspended magnetic nanoparticles. have evaluated MPIS performance by one-dimensional scans structured nanoparticle phantoms, demonstrating, in particular, resolutions ≈2.5 mm prior to deconvolution and << 1 after deconvolution. Our instrument conceptually follows general principle (MPI) encoding distributions into flux density...
We describe a magnetic source imaging camera (MSIC) allowing direct dynamic visualization of the two-dimensional spatial distribution individual components Bx(x,y), By(x,y) and Bz(x,y) field. The field patterns allow—in principle—a reconstruction sources that produce B→ by inverse problem analysis. compare experimentally recorded point-spread functions, i.e., produced point-like dipoles different orientations with anticipated patterns. Currently, MSIC can resolve fields ≈10 pT (1 s...
Copper atoms and molecules are laser ablated into bulk liquid solid helium, the emission spectra of excited D→X, B→X, a→X transitions Cu2 observed to exhibit clearly resolved vibrational bands. Surprisingly, for D→X B→X transitions, no differences were superfluid He at 1.5 K, normal 2.65 or K higher pressures about 30 bars. An interpretation based on bubble model indicates that interaction with matrix is much weaker than in case alkali atoms. Compared other rare gas matrices, line shifts...
We have investigated the dependence of lock-in-demodulated $$M_x$$ -magnetometer signals on orientation static magnetic field $$\mathbf {B}_{0}$$ interest. Magnetic resonance spectra for 2400 discrete orientations covering a $$4\pi$$ solid angle been recorded by PC-controlled steering and data acquisition system. Off-line fits previously derived lineshape functions allow us to extract relevant parameters (shape, amplitude, width, phase) represent their with respect laser beam propagation...
We have observed bulk solidification of 4He induced by nucleation on positive alkali ions in pressurized superfluid helium. The are extracted into the liquid from alkali-doped solid He a static electric field. experiments prove existence charged particles structure composed doped that was recently shown to coexist with helium below pressure. This supports our earlier suggestion Coulomb interaction surrounded shell (snowballs) and electrons trapped spherical cavities (electron bubbles),...
We present an exhaustive overview of optical absorption and laser-induced fluorescence lines Ba atoms in liquid solid helium matrices visible near-infrared spectral ranges. Due to the increased density isolated atoms, we have found a large number that were not observed condensed before. also measured lifetimes metastable states. The lowest ${}^{3}{D}_{1}$ state has lifetime 2.6 s can be used as intermediate two-step excitations high-lying Various matrix-induced radiationless population...
We discuss the interaction between nanometer-sized defects (atomic bubbles) and elementary excitations (phonons) in quantum fluids solids. observe that optical embedded metal atoms induce bubble expansions/contractions create strongly localized phonon wave packets matrix. derive structure dynamics of these vibronic from experimental laser-induced fluorescence spectra Au Cu liquid solid He. The atomic vibrations are found to be damped on 50 Å 5 ps scales agreement with pure hydrodynamic estimations.
We present comparative experimental and theoretical studies of the absorption fluorescence spectra alkali-metal dimer molecules Cs(2) RbCs immersed in a solid helium matrix, thereby extending our recent observations Rb(2) (4)He. The laser-excited molecular states are mostly quenched by interaction with He matrix. quenching efficiently populates second lowest excited state molecule, i.e., (1) (3)Π((u)) that is metastable homonuclear dimers. Molecular excitation emission bands modeled...
We present an experimental study of the laser-induced fluorescence spectra Cu atoms in bulk liquid and solid helium matrices as well dense plasma created by laser ablation copper helium. observe transitions valence electron inner-shell electrons. The former produce structureless line shapes, a large broadening, blueshift. latter practically are not shifted with respect to free atom possess substructure consisting zero-phonon phonon wings. suggest qualitative interpretation observed based on...
Abstract Results are reported from the first full-scale search for transient signals exotic fields of astrophysical origin using data a newly constructed Earth-scale detector: Global Network Optical Magnetometers Exotic physics searches (GNOME). Data collected by GNOME consist correlated measurements optical atomic magnetometers located in laboratories all over world. searched patterns propagating through network consistent with composed ultralight bosons such as axion-like particles (ALPs)....
The nonstationary pump-probe interaction between short laser pulses propagating in a resonant optically dense coherent medium is considered. Special attention paid to the case where density of two-level particles high enough that considerable part energy relatively weak external fields can be coherently absorbed and reemitted by medium. Thus, field reaction plays key role processes, which leads collective behavior an atomic ensemble strongly coupled light-matter system. Such results fast...
Abstract We present a fast and robust optically pumped magnetometer that is based on feedback-controlled spin ensemble of cesium atoms in spin-polarized vapor. The table-top system intended for operation unshielded environment, its design allows conversion into handheld sensor head. Under strongly disturbed environmental conditions the laboratory, exhibits speed more than 56 kHz, while having slew rate 39 mT/s full dynamic range 10 – 120 μT. these sensitivity 33 <m:math...