Article
Optics
Hamza Ather, Adam Zaman Chaudhry
Summary: Quantum probes can be used to estimate parameters of complex systems by interacting with the environment, and considering the correlations between the probe and environment can improve the precision of the estimates for environmental parameters.
Article
Materials Science, Multidisciplinary
Mykola Yelisieiev, Petro Maksymovych, Anna N. Morozovska
Summary: Microwave measurements have been successfully applied to measure ferroelectric materials on the nanoscale, revealing polarization switching and ferroelectric domain walls. The study found that the soft phonon dynamics have a strong influence on the surface potential distribution, complex impedance, and dielectric losses of ferroelectric materials near the Curie temperature.
Article
Chemistry, Physical
Yuuki Adachi, Yasuhiro Sugawara, Yan Jun Li
Summary: Probing CO on a rutile TiO2(110) surface using atomic force microscopy and Kelvin probe force microscopy enables the resolution of the interatomic dipole moment and charge state of CO at atomic resolution. The results suggest that both charge state and on-surface dipole interaction play a significant role in the reaction of CO on rutile TiO2(110) surface.
Article
Chemistry, Physical
Huimin Qiao, Fangping Zhuo, Zhen Liu, Jinxing Wang, Jeongdae Seo, Chenxi Wang, Jinho Kang, Bin Yang, Yunseok Kim
Summary: This study utilizes piezoresponse force microscopy (PFM) to investigate the local electromechanical behavior and distribution of ferrielectric (FiE) and antiferroelectric (AFE) phases in materials. The results demonstrate the significance of PFM as an analytical tool for characterizing materials and their phase coexistence behavior.
Article
Optics
Reddikumar Maddipatla, Patrice Tankam
Summary: Combining optical coherence microscopy with fluorescence microscopy allows for the alignment of structural and functional information, enabling new investigations into biological processes in animal models.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Mathematics, Applied
Jeong Ryeol Choi
Summary: This study investigates the emergence of classicality from a stochastic quantum system through decoherence. The time-dependent parameters, such as mass, frequency, and damping coefficient, are considered. The invariant operator theory is used to describe the quantum evolution of the system, assuming equilibrium with the environment at a finite temperature. Decoherence characteristics, classical correlation, and quantum coherence length are analyzed. The decoherence time in both position and momentum spaces is estimated. The results show that the time dependence of the stochastic process affects the quantum-to-classical transition. The study is further applied to the damped harmonic oscillator, confirming the satisfaction of decoherence condition at high temperature, while classical correlation remains unaffected.
Article
Quantum Science & Technology
Jonginn Yun, Jaemin Park, Hyeongyu Jang, Jehyun Kim, Wonjin Jang, Younguk Song, Min-Kyun Cho, Hanseo Sohn, Hwanchul Jung, Vladimir Umansky, Dohun Kim
Summary: We demonstrate the simultaneous operation and measurement of two-electron spin qubits, decoupled from nuclear noise, in a GaAs quadruple quantum dot array. Coherent Rabi oscillations of both qubits are achieved by tuning their drive frequency using real-time Hamiltonian estimators. Strong two-qubit capacitive interaction and state-conditional frequency shift are observed, consistent with theoretical predictions. The high coherence to conditional phase-flip time ratio suggests the potential for generating high-fidelity and fast quantum entanglement using a simple capacitive interaction.
NPJ QUANTUM INFORMATION
(2023)
Article
Materials Science, Multidisciplinary
Shaojie Xiong, Rui Zhang, Bo Liu, Wangjun Lu, Zhe Sun, Xiaoguang Wang
Summary: Distilling quantum coherence is essential for optimizing quantum technologies, but it is not always guaranteed. Thus, probabilistic distillation of quantum coherence has been developed and successfully implemented. We propose a scheme to achieve one-shot coherence distillation in a superconducting circuit system. By using appropriate incoherent operations, the target maximally coherent state can be extracted from a single prepared state with a finite error tolerance. Our scheme is easy to implement in experiments, requiring only a superconducting qubit as the auxiliary system. Numerical simulations under typical experimental conditions show that the distillation rate of coherence resource can be well achieved with current techniques.
RESULTS IN PHYSICS
(2023)
Article
Optics
Jiaying Xiao, Jinsheng Jiang, Jiaxi Zhang, Yongjun Wang, Bo Wang
Summary: The study of molecular photoacoustic endoscopic imaging in deep tissues is limited due to technical difficulties. In this work, a multimodal acoustic-resolution-based PAE system was set up to image the rabbit rectum and explore the potential of molecular PAE for deep-seated targets. The results show that the system has achieved high resolution and signal-to-noise ratio at an imaging depth of 1.4 cm, and can distinguish the rectum wall and indocyanine green.
Article
Optics
Yuebing Zhou, Jiawei Hu, Hongwei Yu
Summary: In this study, we investigate the entanglement dynamics of an open quantum system composed of two identical two-level subsystems in a common stationary environment undergoing Markovian dissipation, using a set of physical parameters defined with the collective transition coefficients of the system. We systematically examine the steady-state entanglement of the system and provide the necessary and sufficient condition for steady-state entanglement when it is initial-state dependent, along with proposing a conjecture for conditions when it is independent of the initial state. Specific conditions for steady-state entanglement in certain circumstances are also demonstrated.
Article
Engineering, Biomedical
Sarah Latus, Sarah Grube, Tim Eixmann, Maximilian Neidhardt, Stefan Gerlach, Robin Mieling, Gereon Huettmann, Matthias Lutz, Alexander Schlaefer
Summary: This study introduces a robust approach for elasticity quantification from within the tissue using a miniaturized dual-fiber OCE probe. The results demonstrate the feasibility of quantifying local tissue elasticities and the improved robustness in inhomogeneous tissues. In addition, the study shows the potential of applying this method to ex-vivo coronary arteries.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2023)
Article
Optics
MingGuang Shan, Pingke Deng, Zhi Zhong, Lei Liu
Summary: A dual-channel two-wavelength interferometer using a polarized cube beam splitter is proposed to simplify the optical setup. Compared to previous methods, the proposed approach has a simple setup and can capture two single-wavelength interferograms simultaneously.
Article
Optics
Kye-Sung Lee, Naresh Kumar Ravichandran, Woo-Jong Yeo, Hwan Hur, Sangwon Hyun, Ji Yong Bae, Dong Uk Kim, Jong Kim, Ki-Hwan Nam, Min Gab Bog, Ki Soo Chang, Geon Hee Kim
Summary: We propose a method to integrate optical coherence tomography (OCT) and spectrally encoded confocal microscopy (SECM) for complementary imaging by adding orthogonal scanning to the SECM configuration. The co-registration of SECM and OCT is automatic, and the system is compact and cost-effective. Speckle noise reduction is achieved by averaging the speckles generated by shifting the spectral-encoded field in the direction of dispersion. The interfaced multimodal imaging of SECM and OCT was implemented at a speed of approximately 7 frames/s using fast-switching technology and GPU processing.
Article
Materials Science, Multidisciplinary
Chin Chyi Loo, Sha Shiong Ng, Hung Wei Yu, Edward Yi Chang, Chang Fu Dee, Wei Sea Chang
Summary: This study reveals that threading dislocations (TDs) cause pits to form around the InN island boundaries, resulting in the high residual electron concentration in InN. Additionally, positively charged TDs contribute to the high positive current and surface potential observed at the InN island boundary regions.
MATERIALS CHARACTERIZATION
(2023)
Article
Chemistry, Physical
Yaoping Hou, Chengfu Ma, Wenting Wang, Yuhang Chen
Summary: A plasmonic atomic force microscopy (AFM) probe was proposed, utilizing a part of the laser beam to monitor cantilever deflection as the excitation light source. By integrating photonic crystal cavities near the cantilever's free end, a confined hot-spot at the metal-coated tip apex can be induced via transmitted light excitation. Numerical simulations showed that the plasmonic probe can efficiently couple a tilted, linearly polarized beam and achieve a significant local electromagnetic enhancement, making it a powerful tool for simultaneous optical, mechanical, and electrical characterizations.
Article
Physics, Multidisciplinary
T. Luo, L. Lindner, J. Langer, V Cimalla, X. Vidal, F. Hahl, C. Schreyvogel, S. Onoda, S. Ishii, T. Ohshima, D. Wang, D. A. Simpson, B. C. Johnson, M. Capelli, R. Blinder, J. Jeske
Summary: This study systematically investigates the formation and properties of NV centers in chemical vapor deposition diamonds, optimizing NV concentration and charge states through adjustments of nitrogen flow and electron irradiation. It provides a pathway for improving the sensitivity of NV-doped CVD diamonds.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Julia Langer, Volker Cimalla, Vadim Lebedev, Lutz Kirste, Mario Prescher, Tingpeng Luo, Jan Jeske, Oliver Ambacher
Summary: In this study, the generation of nitrogen-vacancy (NV) centers in diamond during chemical vapor deposition (CVD) was investigated by altering the electric-field strength. The experiments showed that by reducing the electric-field strength, thick and high-quality nitrogen-doped diamond could be synthesized without the formation of a polycrystalline rim. The results also demonstrated significant influences of the electric-field strength on the concentrations of radical species and gas temperature, as well as the in situ NV doping efficiency.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Anum Nisar, Harini Hapuarachchi, Laurent Lermusiaux, Jared H. Cole, Alison M. Funston
Summary: This study presents a method for assembling metal and semiconductor nanocrystals into hybrid structures using DNA-based self-assembly. The assembled structures, including dimers and higher-order core-satellite structures, have high purity and can be used for fundamental investigation of the plasmon-exciton interaction. The detuning of energy was found to result in lengthening of the quantum dot emission lifetime and enhancement in steady-state photoluminescence.
ACS APPLIED NANO MATERIALS
(2022)
Article
Physics, Multidisciplinary
Tommy C. Bartolo, Jackson S. Smith, Yannick Schoen, Jan Nicolas Voss, Martin J. Cyster, Alexey Ustinov, Hannes Rotzinger, Jared H. Cole
Summary: This study investigates the role of grain morphology and distribution in granular aluminium thin films formed into nanowire constrictions using experimental and computational approaches. By treating the granular aluminium film as a network of randomly distributed resistors, the electrical characteristics of the nanowires can be modeled. The electromigration process is shown to be driven by the formation of quantum point contacts between metallic aluminium grains.
NEW JOURNAL OF PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Philip Schaetzle, Philipp Reinke, David Herrling, Arne Goetze, Lukas Lindner, Jan Jeske, Lutz Kirste, Peter Knittel
Summary: This article presents a microwave plasma reactor for diamond growth that allows for highly controllable process conditions. The reactor enables accurate control of the position of the diamond substrate, facilitating equilibration of plasma conditions and achieving sharp layer transitions among different types of diamond films. The system also includes features such as substrate heating, a clean reactor environment, and constant monitoring of plasma conditions.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Multidisciplinary Sciences
Jack B. Muir, Jesper Levinsen, Stuart K. Earl, Mitchell A. Conway, Jared H. Cole, Matthias Wurdack, Rishabh Mishra, David J. Ing, Eliezer Estrecho, Yuerui Lu, Dmitry K. Efimkin, Jonathan O. Tollerud, Elena A. Ostrovskaya, Meera M. Parish, Jeffrey A. Davis
Summary: Researchers introduced mobile exciton impurities into a two-dimensional electron gas and conducted experiments on monolayer WS2 using multi-dimensional coherent spectroscopy. They found that at low electron doping densities, the dominant interactions occur between polaron states dressed by the same Fermi sea. Additionally, they discovered a bipolaron bound state with remarkably large binding energy involving excitons in different valleys cooperatively bound to the same electron.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Lucinda Steinfeld, Jared H. Cole, Harini Hapuarachchi
Summary: The prospects of controlling the absorption of cost-effective plasmonic metal nanoparticles Cu and Al using quantum emitters (QEs) are demonstrated semi-analytically. Cu and Au based plasmonic nanoparticles exhibit largely similar exciton-plasmon Fano interaction signatures and similar spectral regions of operation. Cu based nanohybrids show a QE-enhanced maximum absorption that approaches the level of isolated Au MNPs, with decreasing QE-Cu separation, increasing QE dipole element magnitude, and increasing medium permittivity. This makes Cu based exciton-plasmon nanohybrids more economical alternatives for Au MNPs and Au-based nanohybrids in absorption-based applications.
ANNALEN DER PHYSIK
(2023)
Article
Chemistry, Multidisciplinary
Brett C. Johnson, Michael Stuiber, Daniel L. Creedon, Manjith Bose, Amanuel Berhane, Laurens Henry Willems van Beveren, Sergey Rubanov, Jared H. Cole, Vincent Mourik, Alexander R. Hamilton, Timothy L. Duty, Jeffrey Colin McCallum
Summary: The development of devices with both superconducting and semiconducting properties is crucial for emerging quantum technologies. This study investigates superconducting nanowires made on a silicon-on-insulator (SOI) platform. The interdiffusion of aluminum and silicon along the entire length of the nanowire is observed, even at temperatures much lower than the Al-Si eutectic temperature. The phase-transformed material matches the predefined device patterns. The superconducting properties of a transformed mesoscopic ring on the SOI platform are also examined, and quantized low-temperature magnetoresistance oscillations in units of the fluxoid, h/2e, are observed.
Article
Chemistry, Physical
Roslyn Forecast, Francesco Campaioli, Timothy W. Schmidt, Jared H. Cole
Summary: Upconversion processes convert multiple low energy photons into one higher energy photon and have potential applications in photovoltaics and biomedicine. This study focuses on two specific mechanisms for photochemical upconversion in solution: triplet-triplet annihilation (TTA) and singlet oxygen mediated energy transfer (SOMET). A kinetic model is developed to explain the different photoluminescence profiles of oxygenated and deoxygenated systems, and the triplet-triplet annihilation rate constant is estimated from the magnetic field response. Design principles to maximize upconversion photoluminescence intensity in oxygenated solution are determined.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Physical
Roslyn Forecast, Elham M. Gholizadeh, Shyamal K. K. Prasad, Simon Blacket, Patrick C. Tapping, Dane R. McCamey, Murad J. Y. Tayebjee, David M. Huang, Jared H. Cole, Timothy W. Schmidt
Summary: The magnetic field dependence of triplet fusion can be used to determine the parameters of triplet fusion collisions. The reduction of magnetic field effect for perylene triplet fusion is observed as the system moves from quadratic to linear annihilation regimes with an increase in laser power. This approach can be applied to screen potential annihilators for photon upconversion.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Physics, Multidisciplinary
Miles I. Collins, Francesco Campaioli, Murad J. Y. Tayebjee, Jared H. Cole, Dane R. McCamey
Summary: Singlet fission refers to the production of two triplet excitons from one singlet exciton while conserving spin. Although the presence of a spin-2 (quintet) triplet-pair state resulting from singlet fission is well established, the exact mechanism for quintet formation has not been determined, making the design of materials for optimal quintet formation challenging. In this study, the authors propose a mechanism in which fluctuations in inter-triplet exchange coupling drive rapid and efficient quintet formation. They demonstrate that quintet formation is feasible even in the strong-exchange regime, consistent with recent experimental predictions. Evaluating the performance of this quintet formation mechanism under different conformational freedom scenarios, the authors establish a connection between quintet dynamics and material properties of singlet fission molecules.
COMMUNICATIONS PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Gangcheng Yuan, Heather F. Higginbotham, Jiho Han, Anchal Yadav, Nicholas Kirkwood, Paul Mulvaney, Toby D. M. Bell, Jared H. Cole, Alison M. Funston
Summary: This study investigates the photoluminescence anisotropy of CdSe semiconductor nanocrystals experimentally and theoretically. By visualizing emission dipole orientation using defocused wide-field microscopy, it is found that different shaped nanocrystals exhibit different optical properties. The differences in defocused emission patterns of rods and long nanoplatelets are explained by considering valence band structures calculated using multiband effective mass theory and the dielectric effect.
Article
Chemistry, Physical
Anjay Manian, Francesco Campaioli, Rohan J. Hudson, Jared H. Cole, Timothy W. Schmidt, Igor Lyskov, Trevor A. Smith, Salvy P. Russo
Summary: The role of charge transfer states in multi-exciton mechanisms is difficult to model accurately, but the intermolecular packing has been shown to heavily influence these mechanisms. By studying a gas phase perylene dimer, it was found that displaced geometries yield large charge transfer contributions for singlet fission, while triplet-triplet annihilation charge transfer couplings are weak. Slipping of the dimer cofacial geometry is beneficial to both charge transfer-mediated processes within a wavefunction overlap scheme. The results provide insights into singlet fission and can guide further investigations in this field.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
Roslyn Forecast, Francesco Campaioli, Jared H. Cole
Summary: This paper focuses on the effects of magnetic fields on spin-dependent interactions in chemiluminescent fluid solutions. The authors revisit and extend the theory proposed by Atkins and Evans, providing corrections and expanding the theory to triplet and quintet multiplicity states. The findings have significant implications for photochemical upconversion and the study of spin-mediated upconversion and downconversion processes.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2023)
Article
Materials Science, Multidisciplinary
Christian Giese, Patricia Quellmalz, Peter Knittel, Tingpeng Luo, Niklas Mathes, Jan Jeske, Philipp Reinke, Quankui Yang
Summary: This article presents methods for fabricating monolithic diamond integrated photonic devices through Faraday cage-angled etching. The optimal waveguide width is determined through simulation and the fabrication of nitrogen vacancy (NV) center-doped microring resonators is demonstrated. The performance of the devices is verified through microphotoluminescence and cathodoluminescence scans, showing clear cavity lines. This scalable fabrication method enables the creation of a large number of lateral waveguide structures for future applications in integrated quantum sensing devices and spin-based quantum computers.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
