Alexander Khramov
A5082628417- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- Quantum, superfluid, helium dynamics
- Advanced Frequency and Time Standards
- Scientific Research and Discoveries
- Spectroscopy and Laser Applications
- Quantum optics and atomic interactions
- Advanced Chemical Physics Studies
- History and Developments in Astronomy
- Thermodynamic and Structural Properties of Metals and Alloys
- Engineering Technology and Methodologies
- Particle accelerators and beam dynamics
- Quantum Mechanics and Applications
- Muon and positron interactions and applications
- Mass Spectrometry Techniques and Applications
- Atmospheric Ozone and Climate
- Experimental and Theoretical Physics Studies
- Relativity and Gravitational Theory
- Advanced machining processes and optimization
- Laser-Matter Interactions and Applications
- nanoparticles nucleation surface interactions
- Spectroscopy and Quantum Chemical Studies
- Industrial Engineering and Technologies
- Chemical Reactions and Isotopes
TRIUMF
2018-2025
Hanoi Pedagogical University 2
2023
University of Washington
2011-2014
University of British Columbia
2007-2008
Einstein's general theory of relativity from 19151 remains the most successful description gravitation. From 1919 solar eclipse2 to observation gravitational waves3, has passed many crucial experimental tests. However, evolving concepts dark matter and energy illustrate that there is much be learned about gravitating content universe. Singularities in lack a quantum gravity suggest our picture incomplete. It thus prudent explore exotic physical systems. Antimatter was unknown Einstein 1915....
The antimatter equivalent of atomic hydrogen—antihydrogen—is an outstanding testbed for precision studies matter–antimatter symmetry. Here we report on the simultaneous observation both accessible hyperfine components 1S–2S transition in trapped antihydrogen. We determine 2S splitting antihydrogen and—by comparing our results with those obtained hydrogen—constrain charge–parity–time-reversal symmetry-violating coefficients standard model extension framework. Our experimental protocol allows...
In 1928, Dirac published an equation 1 that combined quantum mechanics and special relativity. Negative-energy solutions to this equation, rather than being unphysical as initially thought, represented a class of hitherto unobserved unimagined particles-antimatter. The existence particles antimatter was confirmed with the discovery positron 2 (or anti-electron) by Anderson in 1932, but it is still unknown why matter, antimatter, survived after Big Bang. As result, experimental studies...
Abstract The photon—the quantum excitation of the electromagnetic field—is massless but carries momentum. A photon can therefore exert a force on an object upon collision 1 . Slowing translational motion atoms and ions by application such 2,3 , known as laser cooling, was first demonstrated 40 years ago 4,5 It revolutionized atomic physics over following decades 6–8 it is now workhorse in many fields, including studies degenerate gases, information, clocks tests fundamental physics. However,...
We have produced a quantum degenerate mixture of fermionic alkali-metal ${}^{6}$Li and bosonic spin-singlet ${}^{174}$Yb gases. This was achieved using sympathetic cooling lithium atoms by evaporatively cooled ytterbium in far-off-resonant optical dipole trap. observe the coexistence Bose-condensed ($T/{T}_{\mathrm{c}}\ensuremath{\simeq}0.8$) with $2.3\ifmmode\times\else\texttimes\fi{}{10}^{4}$ Fermi ($T/{T}_{\mathrm{F}}\ensuremath{\simeq}0.3$) $1.2\ifmmode\times\else\texttimes\fi{}{10}^{4}$...
In 1906, Theodore Lyman discovered his eponymous series of transitions in the extreme-ultraviolet region atomic hydrogen spectrum1,2. The patterns spectrum helped to establish emerging theory quantum mechanics, which we now know governs world at scale. Since then, studies involving Lyman-α line-the 1S-2P transition a wavelength 121.6 nanometres-have played an important part physics and astronomy, as one most fundamental Universe. For example, this has long been used by astronomers studying...
We report on the realization of a stable mixture ultracold lithium and ytterbium atoms confined in far-off-resonance optical dipole trap. observe sympathetic cooling 6Li by 174Yb extract s-wave scattering length magnitude |a(6Li-174Yb)|=(13±3)a0 from rate interspecies thermalization. Using forced evaporative 174Yb, we achieve reduction temperature to below Fermi temperature, purely through cooling.
Quantum-degenerate mixtures of one-electron and two-electron atoms form the starting point for studying few- many-body physics mass-imbalanced pairs as well production paramagnetic polar molecules. We recently reported achievement dual-species quantum degeneracy a mixture lithium ytterbium atoms. Here we present details key experimental steps all-optical preparation these mixtures. Further, demonstrate use magnetic field gradient tool to compensate differential gravitational sag two species...
We report on the realization of an ultracold mixture lithium atoms in ground state and ytterbium excited metastable ($^{3}{P}_{2}$) state. Such a can support broad magnetic Feshbach resonances which may be utilized for production molecules with electronic spin degree freedom, as well novel Efimov trimers. investigate interaction properties presence external field find upper limit background interspecies two-body inelastic decay coefficient...
Antiprotons created by laser ionization of antihydrogen are observed to rapidly escape the ALPHA trap. Further, positron plasmas heat more quickly after trap is illuminated light for several hours. These phenomena can be caused patch potentials—variations in electrical potential along metal surfaces. A simple model effects potentials explains particle loss, and an experimental technique using trapped electrons developed measuring electric field produced potentials. The validated controlled...
The formation of Ar and H2 clusters, having up to 900 particles in helium droplets, has been studied via laser induced fluorescence attached Mg-phthalocyanine (Mg-Pc) molecules. In the experiments, one Mg-Pc molecule average was added each He droplet either before or after cluster species, shift spectrum molecules as a function size. For about factor 2 smaller matrix observed for late pickup compared with prior pickup, indicating that former case, reside on surface preformed clusters. On...
We have calculated the propagation of rovibrational wave-packet in $^{1}\ensuremath{\Sigma}$ state $\mathrm{CO}$ and $^{2}\ensuremath{\Pi}$ $\mathrm{NO}$ manipulated by shaped midinfrared femtosecond laser pulses. The rotational states molecules were fully taken into account calculation effects vibrational evolution examined detail. As a result, it is found that excitations associated with excitation affect drastically, which suggests should not be ignored when are used as target for...
We present investigations of the formation rate and collisional stability lithium Feshbach molecules in an ultracold three-component mixture composed two resonantly interacting fermionic ${}^{6}$Li spin states bosonic ${}^{174}$Yb. observe long molecule lifetimes ($>100$ ms) even presence a large ytterbium bath extract reaction coefficients system. find good unitary regime, opening new possibilities for studies probes strongly quantum gases contact with species.
The ALPHA Collaboration, based at the CERN Antiproton Decelerator, has recently implemented a novel beamline for low energy (≲100 eV) positron and antiproton transport between cylindrical Penning traps that have strong axial magnetic fields. Here, we describe how combination of semianalytical numerical calculations was used to optimize layout design this beamline. Using experimental measurements taken during initial commissioning instrument, evaluate its performance validate models...
Abstract The experimental and industrial testing of the developed design a new boring mandrel for processing deep stepped bores in body workpieces gray cast iron has been performed. is characterized by high rigidity fast replacement cutting plates. use current production GAZ Group enterprises allows three to four time increase productivity holes large-scale cylinders.