A5049546238- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Laser-Plasma Interactions and Diagnostics
- Particle accelerators and beam dynamics
- Strong Light-Matter Interactions
- Ion-surface interactions and analysis
- Advanced Thermodynamics and Statistical Mechanics
- Pulsed Power Technology Applications
- Laser-induced spectroscopy and plasma
- High-pressure geophysics and materials
- Physics of Superconductivity and Magnetism
- Magnetic confinement fusion research
- Nuclear Physics and Applications
- Particle Accelerators and Free-Electron Lasers
- Diamond and Carbon-based Materials Research
- Quantum many-body systems
- Quantum and electron transport phenomena
- Plasma Diagnostics and Applications
- Laser-Matter Interactions and Applications
- Physical Unclonable Functions (PUFs) and Hardware Security
- Marine Toxins and Detection Methods
- Hybrid Renewable Energy Systems
- Stochastic processes and statistical mechanics
- Atomic and Subatomic Physics Research
- Random lasers and scattering media
Pontificia Universidad Católica de Chile
2016-2019
Universidad Bernardo O'Higgins
2019
University of Chile
2015
Centre National de la Recherche Scientifique
2009-2012
Laboratoire Charles Fabry
2009-2012
Lawrence Berkeley National Laboratory
2006-2010
École Normale Supérieure - PSL
2008
Délégation Paris 6
2008
Université Paris Cité
2008
Sorbonne Université
2008
We report on local measurements of atom number fluctuations in slices a single 1D Bose gas with repulsive interactions. For weakly interacting gases, the are super-Poissonian at intermediate atomic densities and become sub-Poissonian high once enters into quantum quasi-condensate regime. At stronger interactions, when approaching fermionization regime, we no longer observe statistics; go from Poissonian to as density is increased, those Fermi gas.
We perform measurements of the third moment atom number fluctuations in small slices a very elongated weakly interacting degenerate Bose gas. find positive skewness distribution ideal gas regime and reduced compatible with zero quasi-condensate regime. For our parameters, is thermodynamic quantity whose measurement constitutes sensitive test equation state results are agreement modified Yang-Yang prediction. Moreover, we show that measured reveals presence true three body correlations system.
By measuring the density fluctuations in a highly elongated weakly interacting Bose gas, we observe and quantify transition from ideal gas to quasicondensate regime throughout dimensional crossover purely one-dimensional (1D) an almost three-dimensional (3D) gas. We show that entire region are described surprisingly well by modified Yang-Yang model. Furthermore, find at low temperatures linear scales according interaction-driven scenario of longitudinally uniform 1D whereas high it...
We report on Fourier spectroscopy experiments performed with near-surface nitrogen-vacancy centers in a diamond chip. By detecting the free precession of nuclear spins rather than applying multipulse quantum sensing protocol, we are able to unambiguously identify NMR species devoid harmonics. further show that by engineering different Hamiltonians during precession, hyperfine coupling parameters as well Larmor frequency can be selectively measured high precision (here 5 digits). The...
In the concept of dynamic hohlraum an imploding Z pinch is optically thick to its own radiation. Radiation may be trapped inside give a radiation temperature greater than that outside pinch. The typically produced by colliding outer Z-pinch liner onto inner liner. collision generates strongly radiating shock, and As implosion continues after collision, continue increase due ongoing PdV (pressure times change in volume) work done implosion. principal, point at which burns through, becomes...
Stable and non-toxic fluorescent markers are gaining attention in molecular diagnostics as powerful tools for enabling long reliable biological studies. Such should not only have a half-life under several assay conditions showing no photo bleaching or blinking but also, they must allow their conjugation functionalization crucial step numerous applications such cellular tracking, biomarker detection drug delivery.We report the of stable based on nanodiamonds (NDs) with bifunctional peptide....
We report the first direct observation of collective quantum fluctuations in a continuous field. Shot-to-shot atom number small subvolumes weakly interacting, ultracold atomic 1D cloud are studied using situ absorption imaging and statistical analysis density profiles. In centers, well quasicondensate regime, ratio chemical potential to thermal energy is μ/k(B)T≃4, and, owing high resolution, up 20% microscopically observed phonons. Within nonlocal at variable length, we observe clear...
Terahertz (THz) time-domain spectroscopy is used to investigate the gain and losses of a THz quantum cascade laser (QCL) operating at 2.86 THz. This measurement technique allows access amplitude phase spectra, allowing direct determination gain. At emission frequency QCL, value 6.5 cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-1</sup> found. The can also be studied as function different conditions, even when no action present. Effects such...
Optically activated high voltage switches are commonly used in pulsed power systems for reliable low jitter, multichannel and multiswitch (low inductance) applications. In addition to jitter switching, optical activation provides a degree of electrical isolation between the triggering switching simplifying design. The disadvantages large-gap gas energy, line-of-sight optics, system maintenance required obtain operation. This paper describes two technologies which can reduce or eliminate...
We study experimentally the writing of one- and two-dimensional photorefractive lattices, focusing on often overlooked transient regime. Our measurements agree well with theory, in particular concerning ratio drift to diffusion terms. then transverse dynamics coherent waves propagating a few novel simple configurations. For defocusing linear broad spectrum, we remark that both intensity distributions real space ('discrete diffraction') Fourier ('Brillouin zone spectroscopy') reflect Bragg...
An experiment to inject and match a $10\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$, singly charged ${\mathrm{K}}^{+}$ ion bunch at an energy of 0.3 MeV, current 45 mA, dimensionless perveance ${10}^{\ensuremath{-}3}$ into solenoid lattice has been carried out LBNL. The principal objective this is transport the space-charge dominated beam compare predicted measured emittance. Initial investigation also presented opportunity study electron cloud effects misalignments. A qualitative comparison...
The radiation field in a hohlraum (4 mm diameter×4 length) with ∼10 TW x-ray input has been simultaneously measured by two independent techniques. An active shock breakout measurement of radiation-driven velocity aluminum indicates peak incident flux equivalent to Planckian distribution temperature 147±3 eV. In the same experiment, time- and spatially resolved re-emission from gold wall brightness 145±5
The Neutralized Drift Compression Experiment II (NDCX II) is an induction accelerator planned for initial commissioning in 2012. final design calls a ∼3 MeV, ∼30 A Li+ ion beam, delivered bunch with characteristic pulse duration of 1 ns, and transverse dimension order mm. purpose NDCX to carry out experimental studies material the warm dense matter regime, beam/hydrodynamic coupling experiments relevant heavy based inertial fusion energy. In preparation this new machine, we have carried...
By measuring the density fluctuations in a highly elongated weakly interacting Bose gas, we observe and quantify transition from ideal gas to quasi-condensate regime throughout dimensional crossover purely 1D an almost 3D gas. We show that entire region are described surprisingly well by modified Yang-Yang model. Furthermore, find at low temperatures linear scales according interaction-driven scenario of longitudinally uniform whereas high it degeneracy-driven critical transverse condensation
We study the propagation of tailored wave packets in a computer controlled photo-induced disorder. Disorder correlations cause real space ballistic front exponential Anderson Localization, and novel effects are observed Fourier space.
By measuring atom number fluctuations in slices of a single 1D Bose gas, we probe the crossover from weak to strong interactions and identify signatures sub-regimes dominated by thermal quantum fluctuations.