A5086592616- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Diamond and Carbon-based Materials Research
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- High-pressure geophysics and materials
- Advanced Frequency and Time Standards
- Quantum, superfluid, helium dynamics
- Advanced MRI Techniques and Applications
- Advanced Fiber Laser Technologies
- Electronic and Structural Properties of Oxides
- Magnetic Field Sensors Techniques
- Scientific Research and Discoveries
- Particle physics theoretical and experimental studies
- Earthquake Detection and Analysis
- Mechanical and Optical Resonators
- Force Microscopy Techniques and Applications
- Magnetic and transport properties of perovskites and related materials
- Cosmology and Gravitation Theories
- Ionosphere and magnetosphere dynamics
- Magneto-Optical Properties and Applications
- Seismic Waves and Analysis
- Astrophysics and Cosmic Phenomena
- Boron and Carbon Nanomaterials Research
- Advancements in Battery Materials
Helmholtz Institute Mainz
2016-2025
Johannes Gutenberg University Mainz
2016-2025
GSI Helmholtz Centre for Heavy Ion Research
2020-2025
University of California, Berkeley
2016-2023
California State University, East Bay
2017-2023
Boston University
2023
Lawrence Berkeley National Laboratory
2016-2022
New York University
2022
Twinleaf (United States)
2022
University of Delaware
2022
Numerous theories extending beyond the standard model of particle physics predict existence bosons that could constitute dark matter (DM) permeating universe. In halo (SHM) galactic velocity distribution bosonic DM field defines a characteristic coherence time $\tau_c$. Until recently, laboratory experiments searching for fields have been in regime where measurement $T$ significantly exceeds $\tau_c$, so null results interpreted as constraints on coupling to particles with amplitude $\Phi_0$...
We report the results of a search for axionlike dark matter using nuclear magnetic resonance (NMR) techniques. This is part multi-faceted Cosmic Axion Spin Precession Experiment (CASPEr) program. In order to distinguish from fields, we employ comagnetometry scheme measuring ultralow-field NMR signals involving two different nuclei ($^{13}$C and $^{1}$H) in liquid-state sample acetonitrile-2-$^{13}$C ($^{13}$CH$_{3}$CN). No signal was detected above background. result constrains parameter...
The nature of dark matter, the invisible substance making up over 80% matter in universe, is one most fundamental mysteries modern physics. Ultralight bosons such as axions, axion-like particles, or photons could make matter. Couplings between and nuclear spins may enable their direct detection via magnetic resonance (NMR) spectroscopy: As move through galactic dark-matter halo, they couple to behave if were an oscillating field, generating a dark-matter-driven NMR signal. part cosmic axion...
State-of-the-art magnetic field measurements performed in shielded environments under carefully controlled conditions rarely reflect the realities of those applications envisioned introductions peer-reviewed publications. Nevertheless, significant advances magnetometer sensitivity have been accompanied by serious attempts to bring these magnetometers into challenging working which they are often required. This review discusses ways various (predominantly optically pumped) technologies...
We report the results of an experimental search for ultralight axion-like dark matter in mass range 162 neV to 166 neV. The detection scheme our Cosmic Axion Spin Precession Experiment (CASPEr) is based on a precision measurement $^{207}$Pb solid-state nuclear magnetic resonance polarized ferroelectric crystal. Axion-like can exert oscillating torque spins via electric-dipole moment coupling $g_d$, or gradient $g_{\text{aNN}}$. calibrated detector and characterized excitation spectrum...
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...
Ensembles of nitrogen-vacancy (NV) centers in diamonds are widely utilized for magnetometry, magnetic-field imaging and magnetic-resonance detection. They have not been used magnetometry at zero ambient field because Zeeman sublevels lose first-order sensitivity to magnetic fields as they mixed due crystal strain or electric fields. In this work, we realize a zero-field (ZF) magnetometer using polarization-selective microwave excitation 12C-enriched HPHT sample. We employ circularly...
Experimental searches for exotic spin-dependent forces are attracting a lot of attention because they allow to test theoretical extensions the standard model. Here, we report an experimental search possible force, specifically spin-and-velocity-dependent forces, by using K-Rb-21Ne co-magnetometer and tungsten ring featuring high nucleon density. Taking advantage sensitivity co-magnetometer, pseudomagnetic field from this force is measured be ≤7 aT. This sets limits on coupling constants...
Achieving high energy resolution in spin systems is important for fundamental physics research and precision measurements, with alkali-noble-gas comagnetometers being among the best available sensors. We found a new relaxation mechanism such devices, gradient of Fermi-contact-interaction field that dominates hyperpolarized nuclear spins. report on precise control over distribution, demonstrating tenfold increase hyperpolarization transverse coherence time optimal hybrid optical pumping....
We present a highly sensitive miniaturized cavity-enhanced room-temperature magnetic-field sensor based on nitrogen-vacancy (NV) centers in diamond. The magnetic resonance signal is detected by probing absorption the 1042\,nm spin-singlet transition. To improve absorptive diamond placed an optical resonator. device has sensitivity of 28 pT/$\sqrt{\rm{Hz}}$, projected photon shot-noise-limited 22 pT/$\sqrt{\rm{Hz}}$ and estimated quantum projection-noise-limited 0.43 with sensing volume...
We use magnetic-field-dependent features in the photoluminescence of negatively charged nitrogen-vacancy centers to measure magnetic fields without microwaves. In particular, we present a magnetometer based on level anti-crossing triplet ground state at 102.4 mT with demonstrated noise floor 6 nT/Hz, limited by intensity laser and performance background-field power supply. The technique presented here can be useful applications where sensor is placed close conductive materials, e.g.,...
The ever-increasing demand for high-capacity rechargeable batteries highlights the need sensitive and accurate diagnostic technology determining state of a cell, identifying localizing defects, sensing capacity loss mechanisms. Here, we leverage atomic magnetometry to map weak induced magnetic fields around Li-ion battery cells in magnetically shielded environment. ability rapidly measure nondestructively allows testing even commercial their actual operating conditions, as function charge....
Sensing vector magnetic fields is important to many applications in fundamental physics, bioimaging, and materials science. Sensors exploiting nitrogen-vacancy (N-$V$) centers typically interrogate N-$V$ ensembles oriented all directions, thwarting nanoscale spatial resolution. Utilizing the level anticrossing triplet ground state, authors demonstrate a...
We demonstrate an alignment-based $^{87}\mathrm{Rb}$ magnetometer that is immune to nonlinear Zeeman (NLZ) splitting, addressing important problem in alkali-metal atomic magnetometry. In our scheme, there a single magnetic resonance peak and well-separated hyperfine transition frequencies, making the insensitive or even NLZ-related heading errors. It shown can be implemented for practical measurements geomagnetic environments, photon-shot-noise-limited sensitivity reaches $9\text{ }\text{...
Magnetometry using nitrogen-vacancy (N-<a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline" overflow="scroll"><a:mi>V</a:mi></a:math>) color centers in diamond predominantly relies on microwave spectroscopy. However, microwaves may hinder certain studies involving biological systems or thin conductive samples. This work demonstrates a wide-field, microwave-free imaging magnetometer utilizing N-<d:math xmlns:d="http://www.w3.org/1998/Math/MathML"...
The nonlinear Zeeman effect can induce splitting and asymmetries of magnetic-resonance lines in the geophysical magnetic-field range. This is a major source "heading error" for scalar atomic magnetometers. We demonstrate method to suppress heading error based on spin locking. In an all-optical synchronously pumped magnetometer with separate pump probe beams, we apply radio-frequency field which phase precessing magnetization. results collapse multicomponent asymmetric line ∼100 Hz width...
We demonstrate magnetic induction tomography (MIT) with an all-optical atomic magnetometer. Our instrument creates a conductivity map of conductive objects. Both the shape and size imaged samples compare very well actual size. Given potential magnetometers for miniaturization extreme sensitivity, proof-of-principle presented in this Letter opens up promising avenues development instrumentation MIT.
Light (pseudo-)scalar fields are promising candidates to be the dark matter in Universe. Under certain initial conditions early Universe and/or with types of self-interactions, they can form compact dark-matter objects such as axion stars or $Q$-balls. Direct encounters searched for by using a global network atomic magnetometers. It is shown that range masses and radii not ruled out existing observations, terrestrial encounter rate $Q$-balls sufficiently high (at least once per year)...
The cosmic axion spin precession experiment (CASPEr) is a nuclear magnetic resonance (NMR) seeking to detect and axion-like particles which could make up the dark matter present in Universe. We review predicted couplings of axions with baryonic that enable their detection via NMR. then describe two measurement schemes being implemented CASPEr. first method, presented original CASPEr proposal, consists resonant search continuous-wave NMR spectroscopy. This method offers highest sensitivity...
We derive spectral line shapes of the expected signal for a haloscope experiment searching axionlike dark matter. The knowledge these is needed to optimize an experimental design and data analysis procedure. extend previously known results axion-photon axion-gluon couplings case gradient (axion-fermion) coupling. A unique feature interaction its dependence not only on magnitudes but also directions velocities galactic halo particles, which leads directional sensitivity corresponding...
Ultralight bosonic dark matter (UBDM) can be described by a classical wave-like field oscillating near the Compton frequency of bosons. If measurement scheme for direct detection UBDM interactions is sensitive to signature quadratic in field, then there near-zero-frequency (dc) component signal. Thus, detector with given finite bandwidth used search bosons frequencies many orders magnitude larger than its bandwidth. This opens possibility analogous Hanbury Brown and Twiss intensity...
We propose and demonstrate a general method to calibrate the frequency-dependent response of self-compensating noble-gas-alkali-metal comagnetometers arbitrary spin perturbations. This includes magnetic nonmagnetic perturbations like rotations exotic interactions. The is based on fit field an analytical model. comagnetometer can be inferred using parameters. effectiveness this by comparing rotation experimental measurement response. Our results show that experiments relying zero-frequency...