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Magneto-optical conductivity and circular dichroism in d-wave altermagnets

Physical Review B 2025年第6期111卷 064428-064428页

作者： Wang Chen Xiaoying Zhou Wen-Kai Lou Kai Chang State Key Laboratory of Semiconductor Physics and Chip Technologies Institute of Semiconductors Chinese Academy of Sciences Beijing 100083 China College of Materials Science and Opto-electronic Technology University of Chinese Academy of Sciences Beijing 100049 China Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials School of Physics and Electronics Science Hunan University of Science and Technology Xiangtan 411201 China Center for Quantum Matter School of Physics Zhejiang University Hangzhou 310027 China

We theoretically investigate the Landau levels (LLs) and magneto-optical conductivity of a d-wave altermagnet under a perpendicular magnetic field. Our findings indicate that the LLs, in the absence of a Zeeman field and spin-orbit coupling (SOC), are spin-degenerate and exhibit a linear dependence on both the magnetic field and the level index. Within the framework of linear response theory, the analytical optical transition matrix elements yield isotropic selection rules and anisotropic longitudinal magneto-optical conductivity peaks, regardless of whether SOC is considered. Specifically, in the absence of SOC, only the intraband transition can occur, with the selection rule given by Δn=±1. The spin-resolved longitudinal magneto-optical conductivities without a Zeeman field alternately coincide (Reσxx↑=Reσyy↓ and Reσxx↓=Reσyy↑), resulting in identical spin-resolved Hall magneto-optical conductivities (Imσxy↑=Imσxy↓). In the presence of SOC, both intraband and interband transitions occur, with selection rules of Δn=±1 and ±3. Notably, the magnitude of the magneto-optical conductivities associated with the transition process of Δn=±1 is three orders of magnitude larger than that associated with Δn=±3. This distinctive magneto-optical absorption spectrum clearly reflects the structure of the LLs and leads to strong circular dichroism in the altermagnets. Our results elucidate the magneto-optical properties of altermagnets and can be utilized to determine band parameters at zero magnetic field.

关键词： Dichroism

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Towards Fabrication of Next-Generation Physical sensors Through Integrating Suspended Sub-Micron Silicon Nanowires with Microelectromechanical Systems

Towards Fabrication of Next-Generation Physical Sensors Thro...

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IEEE sensorS

作者： Basit Ali Mehdi Bostan Shirin Muhammad Muzammil Ege Nacarkucuk Sina Zare Pakzad Umut Kerimzade B. Erdem Alaca Department of Mechanical Engineering Koç University Istanbul Turkey Computational Sciences and Engineering Program Koç University Istanbul Turkey Institute of Sensor and Actuator Systems TU Wien Austria Christian Doppler Laboratory for Piezoelectric Silicon MEMS with Enhanced Sensitivity and Responsivity Institute of Sensor and Actuator Systems TU Wien Austria nSTAR-Koç University Nanofabrication and Nanocharacterization Center for Scientific and Technological Advanced Research Koç University Istanbul Turkey Surface Science and Technology Center (KUYTAM) Koç University Istanbul Turkey

ISBN: (数字)9798350363517

ISBN: (纸本)9798350363524

Silicon nanowires possess superior mechanical, electrical, and optical properties, making them ideal for next-generation sensors. This study presents a scalable technology for monolithic fabrication of sub-micron silicon nanowires with micro electromechanical systems, achieving integration of suspended sub-micron silicon nanowires within microelectromechanical systems up to 80 μm thick on Si substrates, with high yield and repeatability. The technological approach is validated on silicon-on-insulator substrates, followed by electromechanical characterization via electrical probe measurements and vibrational testing for performance validation. The presented technology is promising for the potential development of next-generation high-performance physical sensors such as accelerometers and gyroscopes.

关键词： Microelectromechanical systems sensor phenomena and characterization Vibration measurement Silicon sensor systems Nanowires Optical sensors Next generation networking Substrates Electromechanical sensors

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Evaluation of Adjacent and Opposite Current Injection Patterns for 3D Image Reconstruction of the Human Lung Based on a Realistic Model

Evaluation of Adjacent and Opposite Current Injection Patter...

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Impedance Spectroscopy (IWIS), International Workshop on

作者： Mejda Bouchhima Oumaima Bader Mariem Hafsa Salwa Sahnoun Najoua Essoukri Ben Amara Olfa Kanoun National School of Electronics and Telecommunications of Sfax University of Sfax Sfax Tunisia Professorship Measurement and Sensor Technology Chemnitz University of Technology Chemnitz Germany Université de Sousse Ecole Nationale d'Ingénieurs de Sousse LATIS - Laboratory of Advanced Technology and Intelligent Systems Sousse Tunisie Laboratory of Signals Systems Artificial Intelligence and Networks Digital Research Center of Sfax Sfax Tunisia

ISBN: (数字)9798331507626

ISBN: (纸本)9798331507633

Electrical Impedance Tomography (EIT) is a non-invasive, radiation-free imaging technique that can be used for 2D lung imaging. However, 2D EIT has a simplified geometric assumption, which neglects the 3D dynamic lung changes. This study develops a realistic 3D geometrical model including the lungs and thoracic cavity For EIT analysis. Finite Element (FE) models are generated for forward calculation and image reconstruction using an optimized Gauss-Newton (GN) algorithm. Two common current injection patterns - Adjacent and Opposite - are compared. Results show that using the lung-refined model with prior knowledge of the lungs' elements, GN converges with a Pearson correlation (r) of 0.9707 for the opposite pattern, higher than the adjacent pattern which reaches 0.9703. The second metric is the mean squared errors (MSE) between boundary voltages (BV) from reconstructed images and ground truth. It reaches $5.3965 \cdot 10^{-4},5.3963\cdot 10^{-4}$ , and $1.027{6}\cdot 10^{-12}$ for the Opposite pattern, respectively, for an empty cavity, lung-refined mesh without, and with prior knowledge of the lungs' elements. The results prove the efficiency of the Opposite injection pattern compared to the Adjacent pattern. These findings highlight the importance of injection patterns and the benefits of using a lung-refined mesh with prior knowledge of the lungs' elements for more accurate reconstructions.

关键词： Electrical impedance tomography Solid modeling Spectroscopy Three-dimensional displays Accuracy Correlation Lungs Imaging Finite element analysis Image reconstruction

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A Self-Powered Optogenetic System for Implantable Blood Glucose Control

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Research 2022年第4期2022卷 295-307页

作者： Zhuo Liu Yang Zhou Xuecheng Qu Lingling Xu Yang Zou Yizhu Shan Jiawei Shao Chan Wang Ying Liu Jiangtao Xue Dongjie Jiang Yubo Fan Zhou Li Haifeng Ye Key Laboratory for Biomechanics and Mechanobiology of Ministry of Education Beijing Advanced Innovation Centre for Biomedical EngineeringSchool of Biological Science and Medical EngineeringSchool of Engineering MedicineBeihang UniversityBeijing 100191China CAS Center for Excellence in Nanoscience Beijing Key Laboratory of Micro-Nano Energy and Sensor Beijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 101400China Shanghai Frontiers Science Center of Genome Editing and Cell Therapy Biomedical Synthetic Biology Research CenterShanghai Key Laboratory of Regulatory BiologyInstitute of Biomedical Sciences and School of Life SciencesEast China Normal UniversityDongchuan Road 500Shanghai 200241China School of Nanoscience and Technology University of Chinese Academy of SciencesBeijing 100049China Center of Nanoenergy Research School of Physical Science and TechnologyGuangxi UniversityNanning 53004China Institute for Stem Cell and Regeneration Chinese Academy of SciencesBeijing 100101China Chongqing Key Laboratory of Precision Optics Chongqing Institute of East China Normal UniversityChongqing 401120China

Diabetes treatment and rehabilitation are usually a lifetime *** engineered designer cell-therapy holds great promise in regulating blood glucose ***,portable,sustainable,and long-term energy supplementation has previously presented a challenge for the use of optogenetic stimulation in ***,we_purpose a self-powered optogenetic system(SOS)for implantable blood glucose *** SOS consists of a biocompatible far-red light(FRL)source,FRL-triggered transgene-expressing cells,a power management unit,and a flexible implantable piezoelectric nanogenerator(i-PENG)to supply long-term energy by converting biomechanical energy into *** results show that this system can harvest energy from body movement and power the FRL source,which then significantly enhanced production of a short variant of human glucagon-like peptide 1(shGLP-1)in vitro and in ***,diabetic mice equipped with the SOS showed rapid restoration of blood glucose homeostasis,improved glucose,and insulin *** results suggest that the SOs is sufficiently effective in self-powering the modulation of therapeutic outputs to control glucose homeostasis and,furthermore,present a new strategy for providing energy in optogenetic-based cell therapy.

关键词： homeostasis Blood furthermore

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Pure frequency-based dispersive spectroscopy 9

Pure frequency-based dispersive spectroscopy

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9th Symposium on Frequency Standards and Metrology, FSM 2023

作者： Cygan, A. Bielska, K. Charczun, D. Kowzan, G. Nishiyama, A. Wcislo, P. Wójtewicz, S. Zaborowski, M. Maslowski, P. Lisak, D. Ciurylo, R. Fleisher, A.J. Gillis, K.A. Hodges, J.T. Voumard, T. Wilidi, T. Herr, T. Brasch, V. Institute of Physics Faculty of Physics Astronomy and Informatics Nicolaus Copernicus University in Toruń ul. Grudziadzka 5 Toruń87-100 Poland Chemical Sciences Division National Institute of Standards and Technology 100 Bureau Drive GaithersburgMD20899 United States Sensor Science Division National Institute of Standards and Technology 100 Bureau Drive GaithersburgMD20899 United States Deutsches Elektronen-Synchrotron DESY Notkestr. 85 Hamburg22607 Germany CSEM - Swiss Center for Electronics and Microtechnology Neuchâtel2000 Switzerland National Institute of Advanced Industrial Science and Technology 1-1-1 Umezono Ibaraki Tsukuba305-8563 Japan Physics Department Universität Hamburg UHH Luruper Chaussee 149 Hamburg22761 Germany

Dispersion spectroscopy based on frequency measurement of the high finesse optical cavity mode shifts induced by the presence of a gas medium with absorption resonances is an attractive alternative to standard absorptive spectroscopy. The main advantage of such pure frequency-based dispersive spectroscopy technique is the unique combination of sensitivity and accuracy. High sensitivity is ensured by high finesse optical cavities providing extremely long effective optical paths. On the other hand, high accuracy is provided by frequency measurement cavity mode shift. This makes this technique free from systematic errors coming from the non-linearity of light intensity measurements, which is one of the limiting factors in typical absorptive spectroscopy. We review several realizations of dispersive spectroscopy in high finesse optical cavities from Doppler-free to broadband. These techniques are especially useful for studying weak molecular transitions applicable in testing fundamental physics, gas metrology, spectroscopic thermometry, and a new generation of spectroscopic databases. © Published under licence by IOP Publishing Ltd.

关键词： Systematic errors

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Dipole-induced transparency in a cavity-waveguide system with attractive cavity modes

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Physical Review A 2025年第3期111卷 033710-033710页

作者： Zhao-Hui Peng Chun-Xia Jia Yu-Qing Zhang Ying Yang Xiang-Yun Fu Wangjun Lu Le-Man Kuang Hunan Provincial Key Laboratory of Intelligent Sensors and Advanced Sensor Materials and Department of Physics Hunan University of Science and Technology Xiangtan 411201 China Department of Maths and Physics Hunan Institute of Engineering Xiangtan 411104 China Key Laboratory of Low-Dimension Quantum Structures and Quantum Control of Ministry of Education Synergetic Innovation Center for Quantum Effects and Applications and Department of Physics Hunan Normal University Changsha 410081 China Synergetic Innovation Academy for Quantum Science and Technology Zhengzhou University of Light Industry Zhengzhou 450002 China

Dipole-induced transparency (DIT) is one of the most well-known transparency effects in quantum optics and has wide applications in scalable quantum information processing and quantum computation. However, most of the existing literatures only focuses on the DIT effect with coherent dipole-cavity coupling, thus its universality in other types of coupling is still to be clarified. Here, we propose a feasible scheme to realize dissipative dipole-cavity coupling with the assistance of a highly dissipative microcavity, and explicitly exhibit cavity-mode attraction. We then investigate the DIT effect in a cavity-waveguide system with attractive cavity modes and find that it can still be achievable even though the probe light is resonant with two attractive cavity modes. Furthermore, we reveal its underlying transparency mechanism with eigenfrequencies and the effective susceptibility of the dipole-cavity system, and show that its transparency lies in the destructive interference of two attractive cavity modes with splitting damping rates instead of splitting resonance frequencies in coherent coupling. Moreover, we find that the attractive and repulsive phenomena of the effective susceptibility, which also plays an important role in the DIT effect, exist in the dipole-cavity system. Our findings may not only be of importance for gaining a more comprehensive understanding on the DIT effect, but also have potential applications in quantum networks.

关键词： Quantum optics

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Freely Suspended Platinum Diselenide Membranes without Polymer Support for Piezoresistive Pressure Sensing

Freely Suspended Platinum Diselenide Membranes without Polym...

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Device Research Conference

作者： Sebastian Lukas Vikas Jangra Nico Rademacher Michael Gross Eva Desgué Maximilian Prechtl Oliver Hartwig Cormac Ó Coileáin Tanja Stimpel-Lindner Satender Kataria Pierre Legagneux Georg S. Duesberg Max C. Lemme Chair of Electronic Devices RWTH Aachen University Aachen Germany THALES R&T Palaiseau France Faculty of Electrical Engineering and Information Technology (EIT 2) Center for Integrated Sensor Systems Institute of Physics University of the Bundeswehr Munich Neubiberg Germany AMO GmbH Advanced Microelectronic Center Aachen Aachen Germany

Platinum diselenide (PtSe 2 ) is a layered two-dimensional (2D) material with outstanding electronic and piezoresistive properties [1]–[3] . It has demonstrated its potential for membrane-based pressure sensor devices, where poly(methyl methacrylate) (PMMA) supported and suspended the PtSe2 membranes [4] . The impact of the polymer support layer on the response of the suspended 2D material is still under investigation [5] . To study the strain and the piezoresistive behavior, we fabricated and analyzed devices based on suspended PtSe 2 membranes with and without polymer support.

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Ultrasensitive and Selective Electrochemical sensor Based on Yttrium Benzenetricarboxylate Porous Coordination Polymer (Y-BTC) for Detection of Pb2+ from Bio-Analytes

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ECS Journal of Solid State Science and technology 2023年第5期12卷 057002-057002页

作者： Patil, Shubham S. Deore, Kamlesh B. Narwade, Vijaykiran N. Peng, Wen Ping Hianik, Tibor Shirsat, Mahendra D. RUSA Center for Advanced Sensor Technology Department of Physics Dr. Babasaheb Ambedkar Marathwada University MS Aurangabad431 004 India Department of Physics National Dong Hwa University Shoufeng Township Hualien City Taiwan Department of Nuclear Physics and Biophysics Faculty of Mathematics Physics and Informatics Comenius University Bratislava Slovakia

Due to industrialization, the presence of heavy metal ions in various sources of drinking water causes damage to the ecosystem. Determination of heavy metal ions is still arduous due to their toxicity and carcinogenic behavior to humankind. The present investigation deals with the development of a novel ultrasensitive electrochemical sensor for the detection of lead (Pb2+) from pesticide and fruit core. Repetitive laboratory-scale aqueous samples have been tested to validate all sensing parameters, it exhibited highly selective behaviour towards Pb2+. Hydrothermally synthesized Yttrium Benzenetricarboxylate (Y-BTC) has been characterized by means of structural, morphological, electrochemical and spectroscopic characterizations and utilized as a sensing material. Y-BTC sensor’s differential pulse behavior shows affinity towards Pb2+, a detailed sensing mechanism further illustrated by XPS studies, DLS measurements, deformation studies by photoluminescence spectra, and charge transfer resistance obtained from EIS data. The developed Y-BTC sensor showcased an excellent picomolar detection limit of 1 pM. Reliability of developed sensor was confirmed by evaluation of sensitivity (4.4 μA M−1), selectivity (towards Pb2+), repeatability and reproducibility. The proposed sensor would play a vital role in monitoring human health in the upcoming days. © 2023 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.

关键词： Electrochemical sensors

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Chromium-Benzenedicarboxylates Metal Organic Framework for Supersensitive and Selective Electrochemical sensor of Toxic Cd2+, Pb2+, and Hg2+Metal Ions: Study of their Interactive Mechanism

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Journal of the Electrochemical Society 2023年第4期170卷 046505-046505页

作者： Deore, Kamlesh B. Patil, Shubham S. Narwade, Vijaykiran N. Takte, Mahesh A. Khune, Abhaysinh S. Mohammed, Hamed Y. Farea, Maamon A. Sayyad, Pasha W. Tsai, Meng-Lin Shirsat, Mahendra D. RUSA Center for Advanced Sensor Technology Department of Physics Dr Babasaheb Ambedkar Marathwada University MS Aurangabad431 004 India Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan Department of Nuclear Physics and Biophysics Faculty of Mathematics Physics and Informatics Comenius University Bratislava Slovakia

Voltammetric determination of toxic Cd2+, Pb2+, and Hg2+ metal ions using Cr-BDC/GCE (chromium-benzenedicarboxylates/ Glassy Carbon Electrode) electrochemical sensor has been investigated. Cr-BDC (chromium-benzenedicarboxylate ) metal-organic framework was synthesized by using the facile hydrothermal technique and its efficacy investigated using P-XRD, FTIR, RAMAN, AFM, FE-SEM, and BET, while the electrochemical performance was investigated by CV and EIS technique. The determination capability of Cr-BDC/GCE as an electrochemical sensor has been investigated by DPASV technique. Effective Voltammetric parameters such as pH of buffer solution, pre-accumulation potential, and pre-accumulation time have been optimized to enhance the sensitivity, selectivity, LOD, repeatability, reproducibility, and stability of the sensor. The proposed Cr-BDC/GCE electrochemical sensor exhibits a sensitivity of 16.55, 3.45, and 3.33 μA M-1 and LOD of 0.186, 0.116, and 0.124 nM for Cd2+, Pb2+ and Hg2+ ions, respectively. Moreover, the sensor exhibited good selectivity, reproducibility, repeatability and stability. The sensor also exhibited good recovery and low RSD values for actual tap water samples. Interaction mechanism of Heavy Metal Ions with the Cr-BDC/GCE evidenced by CV and FTIR confirms the surface adsorption-controlled reaction. These findings suggest that the Cr-BDC/GCE platform is well-suited to serve as a next-generation electrochemical sensor for detecting alcohol, ketone, hydrocarbons, medicines, etc. © 2023 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.

关键词： Electrochemical sensors

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[email protected] metal organic framework for selective detection of nickel ions in aqueous media

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Ceramics International 2023年第4期49卷 6772-6779页

作者： Gajanan A. Bodkhe Dhanashri D. Khandagale Mayuri S. More Megha A. Deshmukh Nikesh N. Ingle Pasha W. Sayyad Manasi M. Mahadik Sumedh M. Shirsat M.S. Al-Buriahi Meng-Lin Tsai Myunghee Kim Mahendra D. Shirsat Department of Food Science and Technology Yeungnam University Gyeongsan Gyeongsangbuk-do 38541 Republic of Korea RUSA Center for Advanced Sensor Technology Department of Physics Dr. Babasaheb Ambedkar Marathwada University Aurangabad MS 431 004 India Department of Basic & Applied Sciences MGM University Aurangabad 431003 Department of Materials Science and Engineering National Taiwan University of Science and Technology Taipei 10607 Taiwan Department of Physics Sakarya University Sakarya Turkey

Monitoring heavy metal ions (HMIs) in water is always a challenging and vital issue due to their hazardous effects on the environment and human health. Therefore, it is necessary to detect heavy metals in the water. Herein, we first-time report the use of silver nanoparticles (Ag NPs) incorporated copper benzene carboxylate (MOF-199) metal organic framework ( [email protected] ) for detection of heavy metal ions in water. A glassy carbon electrode-modified [email protected] electrochemical sensor probe was fabricated and showed a selective and sensitive response towards nickel (Ni(II)) ions only by cyclic voltammetry . The [email protected] sensor did not offer any cyclic voltammetric sensing response towards cadmium (Cd(II)), lead (Pb(III)), chromium (Cr(III)), and ferric (Fe(III)) ions (1 μM/L) at pH values ranging from 3 to 10. The [email protected] sensor displayed high sensitivity of 1.48 μA/nM on the exponential scale for Ni(II) ions at pH 7 and a lower detection limit of 6.06 nM/L with good reproducibility below US EPA suggested maximum contamination limit. The synthesized [email protected] was characterized by spectroscopic (viz. UV–visible spectroscopy, Raman spectroscopy and mapping, energy dispersive spectroscopy (EDS), Fourier transform infrared (FTIR) spectroscopy), surface area (viz. Brunauer–Emmett-Teller surface area analysis), electrochemical activity (viz. cyclic voltammetry, electrochemical impedance spectroscopy), morphological (viz. field emission scanning electron microscopy (FE-SEM)), structural (viz. X-ray diffraction (XRD)), and thermogravimetric analysis.

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