Article
Chemistry, Multidisciplinary
Umberto Celano, Hai Zhong, Florin Ciubotaru, Laurentiu Stoleriu, Alexander Stark, Peter Rickhaus, Felipe Favaro de Oliveira, Mathieu Munsch, Paola Favia, Maxim Korytov, Patricia Van Marcke, Patrick Maletinsky, Christoph Adelmann, Paul van der Heide
Summary: In this study, nonperturbative field distribution mapping in ultra-scaled magnetic nanowires with diameters down to 6 nm was achieved using scanning nitrogen-vacancy magnetometry, enabling localized, minimally invasive magnetic imaging with sensitivity down to 3 μT Hz(-1/2). The imaging revealed the presence of weak magnetic inhomogeneities inside in-plane magnetized nanowires, largely undetectable with standard metrology. The strong magnetic field confinement in the nanowires allowed for the study of the interaction between the stray magnetic field and the nitrogen-vacancy sensor, clarifying the formation mechanisms for technologically relevant magnetic nanostructures.
Article
Physics, Condensed Matter
Sun Zhaolong, Gao Nan
Summary: In this study, the structural stabilities and electronic properties of boron (B)–nitrogen (N) co-terminated diamond (110) surface were investigated using first-principles calculations. It was found that the H/F mixed (H/F = 1.0) adsorption surface was dynamically and thermally stable, and exhibited no surface spin noise or surface-related state. Additionally, it had a positive electron affinity of 1.11 eV, making it a promising candidate for NV-based quantum sensors.
JOURNAL OF PHYSICS-CONDENSED MATTER
(2023)
Article
Physics, Applied
P. Raecke, L. Pietzonka, J. Meijer, D. Spemann, R. Wunderlich
Summary: NV centers in diamond were engineered by introducing vacancies locally through argon ion implantation in type Ib diamond with subsequent annealing. The number of NV centers created from vacancies of a single implanted argon ion ranges from 0.04 to 0.79 depending on the ion energy. The diffusion of vacancies during annealing plays a significant role in NV yield behavior.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Hossein T. Dinani, Enrique Munoz, Jeronimo R. Maze
Summary: This theoretical work proposes using the nitrogen-vacancy (NV) center in diamond as a nanosensor to detect electrochemical signals from an electrolyte solution, thus obtaining a concentration sensor. By measuring the inhomogeneous dephasing rate of the electron spin of the NV center, the concentration of ions can be estimated for a range of mean ionic concentrations in the solution.
Article
Chemistry, Multidisciplinary
Oliver Roman Opaluch, Nimba Oshnik, Richard Nelz, Elke Neu
Summary: The study introduces a planar, omega-shaped microwave antenna based on stripline for spin control of NV color centers in diamond. An optimal antenna design was found through finite integral simulations, and antennas were successfully fabricated on a glass substrate, creating highly uniform microwave fields.
Article
Nanoscience & Nanotechnology
Marie Krecmarova, Michal Gulka, Thijs Vandenryt, Jaroslav Hruby, Ladislav Fekete, Pavel Hubik, Andrew Taylor, Vincent Mortet, Ronald Thoelen, Emilie Bourgeois, Milos Nesladek
Summary: The label-free biosensor concept is based on manipulation of charge state of nitrogen-vacancy (NV) quantum color centers in diamond, combined with an electrochemical microfluidic flow cell sensor. The functionality of the device was demonstrated by optical detection of DNA molecules, using a strongly cationic charged polymer to shift the charge state of NV centers. The developed electrochemical device can also be applied to nuclear magnetic resonance spin sensing.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Manisha Sharma, Ashish Kumar, Deepika Gill, Shilpi Jaiswal, Abhijit Patra, Saswata Bhattacharya, Venkata Krishnan
Summary: In this study, W-doped Bi2MoO6 nanosheets were synthesized and demonstrated their potential as efficient photocatalysts for the simultaneous production of NH3 and NO3- ions under visible light irradiation. The optimal molar ratio of doped tungsten showed the best photocatalytic NH3 production without using any sacrificial agents. The enhanced photocatalytic activity of the synthesized photocatalysts could be attributed to oxygen vacancy defects caused by Mo substitution by a more electronegative W atom.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
S. Kollarics, F. Simon, A. Bojtor, K. Koltai, G. Klujber, M. Szieberth, B. G. Markus, D. Beke, K. Kamaras, A. Gali, D. Amirari, R. Berry, S. Boucher, D. Gavryushkin, G. Jeschke, J. P. Cleveland, S. Takahashi, P. Szirmai, L. Forro, E. Emmanouilidou, R. Singh, K. Holczer
Summary: High concentration of negatively charged nitrogen-vacancy (NV-) centers was successfully created in diamond single crystals containing approximately 100 ppm nitrogen using electron and neutron irradiation and subsequent thermal annealing. The formation process and properties of NV- centers were observed, with about 25% of vacancies forming NVs during the annealing process, and high precision measurement of hyperfine and quadrupole coupling constants was achieved using EPR techniques.
Article
Physics, Applied
Peng Qian, Xue Lin, Feifei Zhou, Runchuan Ye, Yunlan Ji, Bing Chen, Guangjun Xie, Nanyang Xu
Summary: Machine learning method can optimize the precision of light readout and extract information, providing the best data processing model by learning time-resolved fluorescence data, reducing readout errors and optimizing contrast.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Applied
Cem Gueney Torun, Philipp-Immanuel Schneider, Martin Hammerschmidt, Sven Burger, Joseph H. D. Munns, Tim Schroeder
Summary: The study focuses on the fiber coupling performance of inverted nanocones for enhancing the light outcoupling of color centers in diamond. Optimized designs show high fiber coupling efficiency at specific wavelengths and promising results for broadband performance at room temperature. The analysis indicates that these nanostructures are robust against imperfections in fabrication.
APPLIED PHYSICS LETTERS
(2021)
Article
Multidisciplinary Sciences
Alexander Savvin, Alexander Dormidonov, Evgeniya Smetanina, Vladimir Mitrokhin, Evgeniy Lipatov, Dmitriy Genin, Sergey Potanin, Alexander Yelisseyev, Viktor Vins
Summary: The authors successfully demonstrated lasing in (NV-) centers in diamond, achieving improved laser efficiency by fine-tuning the pump conditions to reduce photoionization. Investigation into lasing conditions and gain saturation was conducted under high-power laser pulse pumping of diamond crystal.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Aedan Gardill, Ishita Kemeny, Matthew C. Cambria, Yanfei Li, Hossein T. Dinani, Ariel Norambuena, Jeronimo R. Maze, Vincenzo Lordi, Shimon Kolkowitz
Summary: The control over charge states of color centers in solids is crucial for quantum technologies, but the microscopic charge dynamics of deep defects remain complex and unknown. By utilizing single-shot charge-state readout of an individual nitrogen-vacancy (NV) center, researchers were able to probe the charge dynamics of surrounding defects in diamond and demonstrate the charge conversion ability of optical illumination in capturing holes. This study sheds light on the importance of charge carrier generation, transport, and capture in quantum device design with color centers, offering a novel approach to probe and control charge dynamics in diamond.
Article
Chemistry, Multidisciplinary
Erin S. Grant, Liam T. Hall, Lloyd C. L. Hollenberg, Gawain McColl, David A. Simpson
Summary: In this study, the magnetic properties of ferritin, the primary storage protein in the body, were systematically studied using diamond-based quantum spin relaxometry. An anomalous magnetic behavior was observed at relatively low iron loads due to a morphological change in the iron core of ferritin. The inclusion of this morphological change in a theoretical model was supported by electron microscopy studies and provided evidence for the magnetic consequence of the morphological change.
Article
Materials Science, Multidisciplinary
Kirill N. Boldyrev, Vadim S. Sedov, Danny E. P. Vanpoucke, Victor G. Ralchenko, Boris N. Mavrin
Summary: The vibrational behavior of the germanium-vacancy (GeV) in diamond has been studied using photoluminescence spectrum and first-principles modeling. Two localized modes associated with the GeV center and neighboring carbon atoms have been identified, corresponding to the observed features in the photoluminescence spectrum.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Lukas Razinkovas, Marek Maciaszek, Friedemann Reinhard, Marcus W. Doherty, Audrius Alkauskas
Summary: The study conducted ab initio calculations on the photoionization characteristics of the NV center in diamond, revealing the mechanism of spin polarization induced electron state transition. These findings are crucial for interpreting and designing experiments on photoionization of NV centers.