Article
Physics, Multidisciplinary
Christopher L. Smallwood, Ronald Ulbricht, Matthew W. Day, Tim Schroeder, Kelsey M. Bates, Travis M. Autry, Geoffrey Diederich, Edward Bielejec, Mark E. Siemens, Steven T. Cundiff
Summary: A high-density sample of negatively charged silicon-vacancy (SiV-) centers in diamond was characterized using collinear optical multidimensional coherent spectroscopy, revealing a hidden population of SiV- centers with significant spectral inhomogeneity and extended electronic T-2 times, likely caused by strain and providing a potential mechanism for controlling electric coherence in color-center-based quantum devices.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
W. Pfaffle, D. Antonov, J. Wrachtrup, G. Bester
Summary: The computational approach presented in this study, based on density functional theory and screened configuration interaction, is capable of accurately treating highly correlated electron spins localized around semiconductor defects. It is computationally not more demanding than a usual density functional theory calculation, making it suitable for calculating isolated defects or defect complexes. This approach has been successfully applied to the nitrogen vacancy defect in diamond with very good agreement with experimental results.
Article
Nanoscience & Nanotechnology
Arava Zohar, Michael Kulbak, Silver H. Turren-Cruz, Pabitra K. Nayak, Adi Kama, Anders Hagfeldt, Henry J. Snaith, Gary Hodes, David Cahen
Summary: We present a powerful approach to assess the defect densities in lead halide perovskite materials based on electric field mapping. By measuring the electric field profile using electron beam-induced current, we deduced the defect densities and found that they mainly exist at the interfaces with selective contacts rather than in the perovskite film. These results are highly relevant for improving the efficiency of photovoltaic devices.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
Phongsaphak Sittimart, Shinya Ohmagari, Tsuyoshi Yoshitake
Summary: The study fabricated pseudo-vertical diamond Schottky barrier diodes (SBDs) on heteroepitaxial substrates with a metal impurity-incorporated buffer layer to suppress killer defects. The SBDs showed excellent rectifying actions, improved in-plane uniformity, and high breakdown voltage, making heteroepitaxial substrates a promising alternative for large-area low-cost diamond electronics.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Viktoria Yurgens, Josh A. Zuber, Sigurd Flagan, Marta De Luca, Brendan J. Shields, Ilaria Zardo, Patrick Maletinsky, Richard J. Warburton, Tomasz Jakubczyk
Summary: The study demonstrates the creation of NV centers in diamond using a solid-immersion lens, enabling low-energy laser writing without inducing surface graphitization. This method presents a potential practical application for two-photon quantum interference employing high-quality NV centers.
Article
Materials Science, Multidisciplinary
Xiaokun Guo, Bing Yang, Jiaqi Lu, Haining Li, Nan Huang, Lusheng Liu, Xin Jiang
Summary: The regulation of charge state in color centers of diamond has been a subject of interest due to their different optical emissions. By depositing microcrystalline diamond membranes containing silicon vacancy centers on n-type silicon substrates, researchers have achieved a rectification ratio of two orders of magnitude higher in diamond/n(+)-Si heterojunctions compared to diamond/n(-)-Si heterojunctions. Detailed analysis of the band diagram showed that electron tunneling from the substrate to the diamond contributed to a larger forward current and brighter photoluminescence emission in the n(+)-Si heterojunctions. This work demonstrates the potential of increasing the population of negatively-charged color centers in diamond through the use of heavily-doped n-type materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Physics, Applied
King Cho Wong, San Lam Ng, Kin On Ho, Yang Shen, Jiahao Wu, Kwing To Lai, Man Yin Leung, Wai Kuen Leung, Durga Bhaktavatsala Rao Dasari, Andrej Denisenko, Joerg Wrachtrup, Sen Yang
Summary: Single color centers in solid have emerged as a promising physical platform for quantum information science. This work proposes and demonstrates a distinct high-temperature annealing (HTA) approach for creating high-quality nitrogen vacancy (N-V) centers in implantation-free diamonds. The created N-V centers possess stable and Fourier-transform-limited optical spectra, and HTA strongly reduces noise sources and improves decoherence time and sensitivity. The study also explores the vacancy activation and defect reformation in spin baths and color centers.
PHYSICAL REVIEW APPLIED
(2022)
Article
Nanoscience & Nanotechnology
Peng Wang, Takashi Taniguchi, Yoshiyuki Miyamoto, Mutsuko Hatano, Takayuki Iwasaki
Summary: Optical observation of PbV centers in diamond revealed their D-3d symmetry and intense emission peaks at low temperatures. The observed large ground state splitting significantly suppresses phonon-mediated transition, suggesting a potential for long spin coherence time at around 9 K. The cubic trend of ZPL width with temperature variation was also noted.
Article
Materials Science, Multidisciplinary
Eduard Sektarov, Vadim Sedov, Victor Ralchenko, Kirill Boldyrev
Summary: This study reveals that X-ray irradiation can alter the charge states of color centers in diamond, resulting in the transformation of negatively charged centers to neutrally charged centers. It also observes new absorption lines, which may belong to different charge states of color centers. This work has significant implications for studying defect charge states in various crystals and for controlling the charge state of color centers in diamond-based quantum optics.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
A. Berzins, J. Smits, A. Petruhins
Summary: This study presents results of using magnetic field imaging technique based on Nitrogen-Vacancy centers in diamond crystal to characterize defects in magnetic thin films. Two types of defects were identified: microscopic impurity islands of ferromagnetic defects caused by non-optimal growth conditions, and mechanical defects introduced post-deposition. The measurements focused on identifying the magnetic field amplitude and distribution of the defects, and correlating magnetic field maps with optical images for quality control and optimization of the device for high throughput.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Physics, Atomic, Molecular & Chemical
V. Vorobyov, J. Javadzade, M. Joliffe, F. Kaiser, J. Wrachtrup
Summary: This paper compares two methods for addressing weakly coupled nuclei: dynamical decoupling and correlation spectroscopy. The spectral resolution required for two single nuclear spins was achieved using these methods, and a new approach was presented to derive components of their hyperfine coupling tensor.
APPLIED MAGNETIC RESONANCE
(2022)
Article
Chemistry, Physical
Charles Babin, Rainer Stoehr, Naoya Morioka, Tobias Linkewitz, Timo Steidl, Raphael Woernle, Di Liu, Erik Hesselmeier, Vadim Vorobyov, Andrej Denisenko, Mario Hentschel, Christian Gobert, Patrick Berwian, Georgy Astakhov, Wolfgang Knolle, Sridhar Majety, Pranta Saha, Marina Radulaski, Nguyen Tien Son, Jawad Ul-Hassan, Florian Kaiser, Joerg Wrachtrup
Summary: Optically addressable spin defects in silicon carbide (SiC) are a promising platform for quantum information processing, enabling high-fidelity spin qubit operations. However, degradation of spin-optical coherence after integration in nanophotonic structures poses a challenge for scalability towards large-scale quantum networks.
Review
Chemistry, Multidisciplinary
Qing Hua Wang, Amilcar Bedoya-Pinto, Mark Blei, Avalon H. Dismukes, Assaf Hamo, Sarah Jenkins, Maciej Koperski, Yu Liu, Qi-Chao Sun, Evan J. Telford, Hyun Ho Kim, Mathias Augustin, Uri Vool, Jia-Xin Yin, Lu Hua Li, Alexey Falin, Cory R. Dean, Felix Casanova, Richard F. L. Evans, Mairbek Chshiev, Artem Mishchenko, Cedomir Petrovic, Rui He, Liuyan Zhao, Adam W. Tsen, Brian D. Gerardot, Mauro Brotons-Gisbert, Zurab Guguchia, Xavier Roy, Sefaattin Tongay, Ziwei Wang, M. Zahid Hasan, Joerg Wrachtrup, Amir Yacoby, Albert Fert, Stuart Parkin, Kostya S. Novoselov, Pengcheng Dai, Luis Balicas, Elton J. G. Santos
Summary: Research on magnetism in 2D van der Waals materials has shown exciting potential for future applications, although challenges remain. It provides important theoretical foundations and guidance for future applications.
Article
Nanoscience & Nanotechnology
Stefania Castelletto, Alberto Peruzzo, Cristian Bonato, Brett C. Johnson, Marina Radulaski, Haiyan Ou, Florian Kaiser, Joerg Wrachtrup
Summary: In the past two decades, there have been significant advancements in the growth of silicon carbide (SiC) for electronic devices, particularly in high-power and high-frequency applications. Recent research has also uncovered unique optical properties of SiC that can be used for novel photonic devices. The combination of excellent electronic, photonic, and spintronic properties in SiC has prompted research in the development of devices and sensors in the quantum technology domain.
Article
Physics, Applied
Naoya Morioka, Di Liu, Oney O. Soykal, Izel Gediz, Charles Babin, Rainer Stoehr, Takeshi Ohshima, Nguyen Tien Son, Jawad Ul-Hassan, Florian Kaiser, Joerg Wrachtrup
Summary: This study provides a thorough investigation of the spin-optical dynamics of silicon vacancy centers in silicon carbide, including excited-state lifetimes, intersystem-crossing rates, and photoemission dynamics. The results deepen our understanding of the system and guide the implementation of scalable quantum applications based on silicon vacancy centers in silicon carbide.
PHYSICAL REVIEW APPLIED
(2022)
Article
Optics
Kangwei Xia, Fiammetta Sardi, Colin Sauerzapf, Thomas Kornher, Hans-Werner Becker, Zsolt Kis, Laszlo Kovacs, Denis Dertli, Jonas Foglszinger, Roman Kolesov, Joerg Wrachtrup
Summary: Electro-optical control is an essential tool for efficient integrated photonics, and lithium niobate on insulator (LNOI) is an emerging platform for on-chip photonics. Researchers have successfully incorporated rare-earth ion quantum emitters into electro-optical tunable lithium niobate thin films and demonstrated dynamic control over the frequency and Purcell enhancement of the microcavities. Single ions have been detected in the experiments.
Article
Quantum Science & Technology
Jonas Foglszinger, Andrej Denisenko, Thomas Kornher, Matthias Schreck, Wolfgang Knolle, Boris Yavkin, Roman Kolesov, Joerg Wrachtrup
Summary: This study demonstrates that the TR12 radiative defect in diamond exhibits a strong optically detected magnetic resonance (ODMR) signal and has stable detection capability even for strong off-axis magnetic fields. This makes TR12 centers suitable for vector magnetometry at high magnetic fields.
NPJ QUANTUM INFORMATION
(2022)
Article
Neurosciences
Chen Zhang, Jixing Zhang, Matthias Widmann, Magnus Benke, Michael Kuebler, Durga Dasari, Thomas Klotz, Leonardo Gizzi, Oliver Roehrle, Philipp Brenner, Joerg Wrachtrup
Summary: Magnetometers based on color centers in diamond exhibit excellent performance in sensitivity, bandwidth, dynamic range, and spatial resolution, making them widely applicable in various fields from biology and chemistry to industry. This study discusses the potential benefits of using these magnetometers for Magnetomyography (MMG) and Magnetoneurography (MNG) applications by analyzing sensitivity, dynamic range, and bandwidth, and comparing them to state-of-the-art techniques.
FRONTIERS IN NEUROSCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Jeffrey Neethi Neethirajan, Toni Hache, Domenico Paone, Dinesh Pinto, Andrej Denisenko, Rainer Stoehr, Peter Udvarhelyi, Anton Pershin, Adam Gali, Joerg Wrachtrup, Klaus Kern, Aparajita Singha
Summary: Near-surface negatively charged nitrogen vacancy (NV) centers show promise for magnetic imaging and quantum sensing, but their charge-state instabilities decrease fluorescence and NV coherence time, negatively affecting imaging sensitivity. In this study, we demonstrate that in situ adsorption of H2O on the diamond surface can partially recover the performance of shallow NV sensors. Controlled surface treatments are essential for implementing NV-based quantum sensing protocols under cryogenic ultrahigh vacuum conditions, as supported by band-bending calculations.
Article
Physics, Multidisciplinary
Yang Shen, Ping Wang, Chun Tung Cheung, Joerg Wrachtrup, Ren-Bao Liu, Sen Yang
Summary: Extracting useful signals is crucial for both classical and quantum technologies. Conventional noise filtering methods, limited in their application scope, rely on different patterns of signal and noise in frequency or time domains, while our proposed signal-nature-based approach leverages the intrinsic quantum nature of the system to single out quantum signals. We demonstrate the extraction of quantum correlation signals and the ability to separate the signal of a remote nuclear spin from overwhelming classical noise backgrounds, which is not achievable by conventional filter methods. Our work highlights the importance of quantum or classical nature as a new degree of freedom in quantum sensing and opens up new directions for quantum research.
PHYSICAL REVIEW LETTERS
(2023)
Correction
Physics, Multidisciplinary
Thomas Wolf, Philipp Neumann, Kazuo Nakamura, Hitoshi Sumiya, Takeshi Ohshima, Junichi Isoya, Joerg Wrachtrup
Article
Physics, Applied
Kin On Ho, Man Yin Leung, Wenyan Wang, Jianyu Xie, King Yau Yip, Jiahao Wu, Swee K. Goh, Andrej Denisenko, Joerg Wrachtrup, Sen Yang
Summary: High-pressure experiments play a crucial role in interdisciplinary research fields, but local probing techniques are limited due to the confinement of pressure chamber. The negatively charged nitrogen-vacancy (N-V) center has emerged as a versatile quantum sensor in pressurized environments. In this work, we compare the stress environments and performance of implanted N-V centers (IN-Vs) and N-V-enriched nanodiamonds (NDs) in a diamond anvil cell (DAC), revealing significant differences in stress tensors. We also propose methods to extend the working pressure of quantum sensing and explore more applications of the N-V center under pressure.
PHYSICAL REVIEW APPLIED
(2023)
Article
Optics
Vadim V. Vorobyov, Jonas Meinel, Hitoshi Sumiya, Shinobu Onoda, Junichi Isoya, Oleg Gulinsky, Joerg Wrachtrup
Summary: The ability to track and control the dynamics of a quantum system is crucial for quantum technology, but reconstructing the dynamics of a single quantum system from macroscopic data remains a challenging problem. In this study, we use weak measurements with an electron spin as a meter to track a single nuclear carbon spin in a diamond at room temperature. Through theoretical analysis and experiments, we establish the relationship between the statistical properties of the macroscopic readout signal of the electron spin and the quantum dynamics of the nucleus, and successfully reconstruct the quantum correlation using a measurement parameter. We validate our approach using the Leggett-Garg test.
Article
Materials Science, Multidisciplinary
Federico Chiossi, Eloise Lafitte-Houssat, Kangwei Xia, Fiammetta Sardi, Zhonghan Zhang, Sacha Welinski, Perrine Berger, Loic Morvan, Varvara Foteinou, Alban Ferrier, Diana Serrano, Roman Kolesov, Joerg Wrachtrup, Philippe Goldner
Summary: This study investigates the optical and spin properties of 171Yb3+ ions in lithium niobate materials, revealing narrow optical homogeneous linewidths and long spin relaxation times at low temperatures, which are suitable for various applications in quantum photonics.
Article
Physics, Multidisciplinary
Ning Wang, Chu-Feng Liu, Jing-Wei Fan, Xi Feng, Weng-Hang Leong, Amit Finkler, Andrej Denisenko, Joerg Wrachtrup, Quan Li, Ren-Bao Liu
Summary: The study demonstrates that the relatively strong hyperfine coupling from a first-shell C-13 nuclear spin provides an effective bias field to achieve zero-field magnetometry and suppress charge noises in shallow nitrogen-vacancy centers. The hyperfine bias greatly enhances magnetic sensitivity and allows simultaneous measurement of magnetic noises at two different frequencies, providing spectral information of high-frequency noises.
PHYSICAL REVIEW RESEARCH
(2022)
