Article
Multidisciplinary Sciences
Rahmetullah Varol, Zeynep Karavelioglu, Sevde Omeroglu, Gizem Aydemir, Aslihan Karadag, Hanife E. Meco, Ali A. Demircali, Abdurrahim Yilmaz, Gizem C. Kocal, Gulsum Gencoglan, Muhammed E. Oruc, Gokhan B. Esmer, Yasemin Basbinar, Sahin K. Ozdemir, Huseyin Uvet
Summary: Accurate assessment of cell stiffness distribution is crucial for understanding the regulation of vital cellular processes and the onset and progress of diseases. This study presents a simple, fast, label-free, and high-resolution technique using acoustic stimulation and holographic imaging to reconstruct stiffness maps of individual cells. This technique has the potential for widespread use in cancer studies, disease modeling, drug testing, and diagnostics.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Z. H. I. Y. U. A. N. Ye, W. A. N. T. I. N. G. Hou, J. I. L. U. N. Zhao, Hai-bo Wang, J. U. N. Xiong
Summary: Since 2009, there has been a paradigm shift from pseudo-thermal ghost imaging (GI) to computational GI, which allows image formation using a single-pixel detector and has cost-effective advantages in certain unconventional wave bands. In this letter, we propose a computational holographic ghost diffraction (CH-GD) paradigm that replaces classical ghost diffraction (GD) with computational methods by measuring field correlation functions instead of intensity correlation functions. CH-GD not only allows the observation of diffraction patterns but also retrieves the complex amplitude of the diffracted light field, enabling digital refocusing and the potential to obtain multi-modal information in a compact and lensless manner.
Article
Nanoscience & Nanotechnology
D. A. Khokhlov, R. S. Akzyanov
Summary: In this study, theoretical investigation of quasiparticle interference in superconducting topological insulators reveals that interference patterns exhibit nematic behavior for small bias voltages and are sensitive to the orientation of the nematicity. The violation of rotational symmetry is observed in both coordinate and momentum spaces, with interference patterns resembling those of the normal state when the bias voltage is comparable to the order parameter value. The results are compared with existing experimental data.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
Article
Chemistry, Multidisciplinary
Thien An Nguyen, Jaejin Lee
Summary: Holographic data storage (HDS) is a potential candidate for future storage systems, with high capacity and fast data access rate. In this research, a new 2D generalized partial response (GPR) target is introduced to estimate the 2D interference, and a method to analyze the 2D GPR target into two serial one-dimensional (1D) GPR targets is proposed. Simulation results show that our proposed scheme can improve the BER performance compared to the conventional 1D GPR target model.
APPLIED SCIENCES-BASEL
(2022)
Article
Astronomy & Astrophysics
Eugenia Colafranceschi, Goffredo Chirco, Daniele Oriti
Summary: This paper investigates the mapping relationship between quantum states in quantum geometric models sharing the same type of loop quantum gravity, and determines the conditions for isometric mapping. Different types of quantum states are analyzed to identify those defining isometric bulk-to-boundary maps.
Article
Chemistry, Multidisciplinary
Peter Vancso, Alexandre Mayer, Peter Nemes-Incze, Geza Istvan Mark
Summary: The paper introduces two calculation methods based on wave packet dynamics for studying the physical properties of materials under the influence of structural defects. By experimental verification, these methods can be used to study quasiparticle scattering and interference effects on 2D materials.
APPLIED SCIENCES-BASEL
(2021)
Review
Optics
Hai Yu
Summary: This paper introduces an angular displacement measurement technology based on in-line digital holographic reconstruction, achieving high measurement resolution by reconstructing the optical information of calibrated gratings in a small volume.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Thien An Nguyen, Jaejin Lee
Summary: In this study, a 2D interference estimator is proposed to address the problem of 2D inter-symbol interference (ISI) in holographic data storage (HDS). A parallel structure is also introduced to effectively exploit horizontal interference (HI) and vertical interference (VI). Simulation results demonstrate that the proposed model significantly improves the performance of HDS.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Ruoqi Deng, Boya Di, Hongliang Zhang, Yunhua Tan, Lingyang Song
Summary: This letter presents a reconfigurable holographic surface (RHS) for the sixth-generation (6G) wireless communications, which offers accurate multi-beam steering with low power consumption. By utilizing holographic technique for amplitude-controlled beamforming, the proposed solution enables convenient implementation of transceivers.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2021)
Article
Optics
Yanjun Fu, Pengfei Zuo, Lu Tian, Hailong Li, Kejun Zhong, Yiliang Huang, Baiheng Ma, Zhanjun Yan
Summary: This study conducts qualitative and quantitative analysis of internal defects in objects using differential holographic double-exposure and digital image processing techniques. The size of the defects is determined by comparing interference fringes produced by different temperature holograms, and the experimental results are validated using a structured light 3D measurement method.
OPTICS AND LASER TECHNOLOGY
(2024)
Article
Materials Science, Multidisciplinary
Shan Zhao, Bin Liu, Yi-feng Yang, Shiping Feng
Summary: Recent observations of two nodeless gaps in superconducting CeCu2Si2 have sparked intense debates over its exact gap structure, either sign-reversal (s+-) or sign-preserving (s++) pairing. In this study, we investigate the quasiparticle interference (QPI) using realistic Fermi surface topology and find qualitative distinctions between s+- and s++ pairing states, providing important insights into the true pairing symmetry in the material.
Article
Optics
Tatsuki Tahara, Yuichi Kozawa, Ryutaro Oi
Summary: This paper proposes a single-path single-shot phase-shifting digital holographic microscopy (SSP-DHM) method for acquiring the quantitative phase information of an object wave without a laser light source. The method simultaneously obtains multiple phase-shifted holograms using a linear polarizer, a liquid crystal on a silicon spatial light modulator (LCoS-SLM), and a polarization-imaging camera. The paper demonstrates the quantitative phase imaging ability and single-shot imaging ability of SSP-DHM through complex amplitude imaging of a USAF1951 test target, phase imaging of transparent HeLa cells, and motion-picture imaging of transparent particles.
Article
Chemistry, Analytical
Ante Topic, Mladen Russo, Maja Stella, Matko Saric
Summary: This study develops a model to recognize emotions from EEG signals in the construction of the Brain-Computer Interface (BCI) device. It finds that using holographic features and optimized electrode selection can improve the accuracy of emotion recognition, achieving better results than previous research.
Article
Biology
Felix Schmieder, Rouhollah Habibey, Johannes Striebel, Lars Buettner, Juergen Czarske, Volker Busskamp
Summary: We improved a glia-neuron co-culture protocol and utilized full-field optogenetic and holographic stimulation to assess the electrical features and functional connectivity patterns of human-induced pluripotent stem cell-derived neuronal networks.
LIFE SCIENCE ALLIANCE
(2022)
Article
Physics, Particles & Fields
Kfir Dolev, Vladimir Calvera, Samuel S. Cree, Dominic J. Williamson
Summary: This article introduces a generalized gauging map method to map quantum many-body systems with global symmetry to ones with local gauge symmetry. By applying this method, holographic codes with global-symmetric bulk systems can be converted to ones with gauge-symmetric bulk systems and vice versa, while preserving the duality with a global-symmetric boundary. It also discusses the construction of holographic codes with gauge-symmetric bulk systems and the application of the generalized gauging map to construct codes with arbitrary transversal gate sets.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Article
Instruments & Instrumentation
G. Simutis, A. Bollhalder, M. Zolliker, J. Kuespert, Q. Wang, D. Das, F. Van Leeuwen, O. Ivashko, O. Gutowski, J. Philippe, T. Kracht, P. Glaevecke, T. Adachi, M. Zimmermann, S. Van Petegem, H. Luetkens, Z. Guguchia, J. Chang, Y. Sassa, M. Bartkowiak, M. Janoschek
Summary: We propose an in situ uniaxial pressure device designed for small angle x-ray and neutron scattering experiments at low temperatures and high magnetic fields. The device uses a rod with an integrated transducer to transmit force to the sample, allowing forces of up to 200 N in both compressive and tensile configurations. It can be operated in a continuous-pressure mode with feedback control while the temperature is changing. The device is compatible with various instruments and cryostats through simple and exchangeable adapters, and it supports rapid sample changes with multiple sample holders.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Multidisciplinary Sciences
Z. Guguchia, C. Mielke, D. Das, R. Gupta, J. -X. Yin, H. Liu, Q. Yin, M. H. Christensen, Z. Tu, C. Gong, N. Shumiya, Md Shafayat Hossain, Ts Gamsakhurdashvili, M. Elender, Pengcheng Dai, A. Amato, Y. Shi, H. C. Lei, R. M. Fernandes, M. Z. Hasan, H. Luetkens, R. Khasanov
Summary: In this study, pressure-tuned and ultra-low temperature muon spin spectroscopy was used to uncover the unconventional nature of superconductivity in RbV3Sb5 and KV3Sb5. It was found that at ambient pressure, time-reversal symmetry breaking charge order was observed in RbV3Sb5, and the superconducting state displayed a nodal energy gap and reduced superfluid density. Applying pressure suppressed the charge-order transitions, increased the superfluid density, and progressively evolved the superconducting state from nodal to nodeless. The optimal superconductivity state was found to break time-reversal symmetry. These results offer unique insights into the nature of the pairing state and highlight the tunable nodal kagome superconductivity competing with time-reversal symmetry-breaking charge order.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Charlotte Pughe, Otto H. J. Mustonen, Alexandra S. Gibbs, Stephen Lee, Rhea Stewart, Ben Gade, Chennan Wang, Hubertus Luetkens, Anna Foster, Fiona C. Coomer, Hidenori Takagi, Edmund J. Cussen
Summary: Ba2CuTeO6 is a material with a two-leg spin ladder structure of Cu2+ cations, which can be chemically tuned by substituting non-magnetic Zn2+ at the Cu2+ site. The substitution partitions the spin ladders into clusters, leading to a transition from long-range order to spin-freezing as the Zn2+ substitution increases. This provides a well-controlled tuning of the magnetic disorder and a model system for studying defects and segmentation in low-dimensional quantum magnets.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Benjamin Kintzel, Michael Boehme, Daniel Plaul, Helmar Goerls, Nicolas Yeche, Felix Seewald, Hans -Henning Klauss, Andrei A. Zvyagin, Erik Kampert, Thomas Herrmannsdoerfer, Gwendolyne Pascua, Christopher Baines, Hubertus Luetkens, Winfried Plass
Summary: The trinuclear high-spin iron(III) complex [Fe3Cl3(saltag(Br))(py)(6)]ClO4 was synthesized and characterized. Magnetic measurements showed antiferromagnetic exchange between the iron(III) ions, resulting in a geometrically spin-frustrated ground state. High-field magnetization and muon-spin relaxation experiments confirmed the isotropic nature of the magnetic exchange and the absence of significant intermolecular interactions. The complex is considered an ideal candidate for studying spin-electric effects.
INORGANIC CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Yigui Zhong, Jinjin Liu, Xianxin Wu, Zurab Guguchia, J. -x. Yin, Akifumi Mine, Yongkai Li, Sahand Najafzadeh, Debarchan Das, Charles Mielke, Rustem Khasanov, Hubertus Luetkens, Takeshi Suzuki, Kecheng Liu, Xinloong Han, Takeshi Kondo, Jiangping Hu, Shik Shin, Zhiwei Wang, Xun Shi, Yugui Yao, Kozo Okazaki
Summary: The newly discovered kagome superconductors offer a promising platform to explore the interplay between band topology, electronic order, and lattice geometry. However, the nature of the superconducting ground state and the electron pairing symmetry in this system is still not well understood. In this study, we directly observed a nodeless and nearly isotropic superconducting gap in the momentum space of two different kagome superconductors using high-resolution and low-temperature angle-resolved photoemission spectroscopy. The unique properties of the superconducting gap are independent of charge order in the normal state. This comprehensive characterization provides essential information about the electron pairing symmetry in kagome superconductors and advances our understanding of superconductivity and intertwined electronic orders in quantum materials.
Article
Instruments & Instrumentation
Lars Gerchow, Sayani Biswas, Gianluca Janka, Carlos Vigo, Andreas Knecht, Stergiani Marina Vogiatzi, Narongrit Ritjoho, Thomas Prokscha, Hubertus Luetkens, Alex Amato
Summary: The pioneering work on Muon-induced x-ray emission (MIXE) technique was conducted at the Paul Scherrer Institute (PSI) in the 1980s for non-destructive assessment of elemental compositions. In recent years, this method has been improved and adopted at many muon facilities worldwide. The GermanIum Array for Non-destructive Testing (GIANT) setup at PSI is a dedicated MIXE spectrometer that offers excellent performance and has been used for various applications such as archaeological research and collaboration with the industry.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Humanities, Multidisciplinary
Sayani Biswas, Isabel Megatli-Niebel, Lilian Raselli, Ronald Simke, Thomas Elias Cocolios, Nilesh Deokar, Matthias Elender, Lars Gerchow, Herbert Hess, Rustem Khasanov, Andreas Knecht, Hubertus Luetkens, Kazuhiko Ninomiya, Angela Papa, Thomas Prokscha, Peter Reiter, Akira Sato, Nathal Severijns, Toni Shiroka, Michael Seidlitz, Stergiani Marina Vogiatzi, Chennan Wang, Frederik Wauters, Nigel Warr, Alex Amato
Summary: A knob bow fibula of the Leutkirch type was excavated in 2018 in Switzerland and analyzed for its elemental composition. The fibula was made of bronze and consisted of two workpieces, with one being cast bronze and the other being forged bronze. The main elements in the fibula were copper, zinc, tin, and lead.
Article
Chemistry, Multidisciplinary
Ziga Gosar, Tina Arh, Kevin Jaksetic, Andrej Zorko, Wenhao Liu, Hanlin Wu, Chennan Wang, Hubertus Luetkens, Bing Lv, Denis Arcon
Summary: Quasi-one-dimensional electron systems exhibit instability towards long-range ordered phases at low temperatures. In this study, muon spin rotation and relaxation (& mu;SR) were used to investigate the superconducting state in Rb2Mo3As3, which has one of the highest critical temperatures Tc = 10.4 K among quasi-one-dimensional superconductors. The results show stronger damping below Tc due to the formation of a vortex lattice. Comparison of different models suggests that the s-wave scenario provides the best fit, but with an anomalously small superconducting gap ⠁0/Tc ratio of 2 ⠁0/kBTc = 2.74(1). However, the nodal p-wave or d-wave scenarios cannot be ruled out based on slightly worse fits, yielding more realistic ratios of 2 ⠁0/kBTc = 3.50(2) and 2 ⠁0/kBTc = 4.08(1), respectively.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Review
Materials Science, Multidisciplinary
Z. Guguchia, R. Khasanov, H. Luetkens
Summary: Kagome lattices are intriguing and rich platforms for studying the intertwining of topology, electron correlation, and magnetism. In this review, recent experimental progress on superconductivity and magnetic fingerprints of charge order in kagome-lattice systems is discussed. The systems include AV(3)Sb(5), LaRu3Si2, and CeRu2, which exhibit unique properties such as time-reversal symmetry-breaking charge ordered state, unconventional superconductivity, and rare nodeless magnetic kagome superconductivity.
NPJ QUANTUM MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
J. M. Law, H. Luetkens, G. Pascua, Th. Hansen, R. Glaum, Z. -s. Wang, J. Wosnitza, R. K. Kremer
Summary: We investigated the long-range magnetic ordering in the linear-chain spin S = 1/2 compound CuCrO4 using powder neutron diffraction and muon-spin rotation measurements. Both methods confirmed the presence of incommensurate long-range antiferromagnetic ordering below 8.5(3) K. The magnetic structure was determined based on neutron powder diffraction patterns, with a propagation vector iota = (0, 0, 0.546(1)). The Cu moments form a helicoidal spiral with an easy plane coinciding with the equatorial planes of the Jahn-Teller elongated CuO6 octahedra. The multiferroic phase was found to extend up to similar to 25 T, beyond which a new phase appeared. The magnetic moment is expected to fully saturate at fields much higher than 60 T.
Proceedings Paper
Physics, Applied
Fabian Hotz, Tina Arh, Zurab Guguchia, Debarchan Das, Chennan Wang, Matjaz Gomilsek, Andrej Zorko, Hubertus Luetkens
Summary: Muon Knight-shift measurements are challenging due to the lack of a direct method for measuring the applied external magnetic field. We propose a solution to this problem and suggest a suitable sample mounting and correcting scheme. This allows us to accurately determine the Knight-shift values even in extreme sample environments where separate measurements of the magnetic field are not feasible or practical using NMR or additional mu SR.
15TH INTERNATIONAL CONFERENCE ON MUON SPIN ROTATION, RELAXATION AND RESONANCE
(2023)
Article
Materials Science, Multidisciplinary
E. Chan, H. Lane, J. Pasztorova, M. Songvilay, R. D. Johnson, R. Downie, J-W. G. Bos, J. A. Rodriguez-Rivera, S. -W. Cheong, R. A. Ewings, N. Qureshi, C. Stock
Summary: MnSb2O6 is a noncentrosymmetric crystal with magnetic properties. It exhibits a tilted helicoidal magnetic structure at temperatures below 12K. However, this tilted structure is not favored over the pure cycloidal structure.
Article
Materials Science, Multidisciplinary
V. K. Anand, D. T. Adroja, C. Ritter, Debarchan Das, Harikrishnan S. Nair, A. Bhattacharyya, Leandro Liborio, Simone Sturniolo, F. L. Pratt, Duc Le, G. Andre, Hubertus Luetkens, A. D. Hillier, Z. Hossain
Summary: We present results of muon spin relaxation (mu SR), neutron powder diffraction (NPD), and inelastic neutron scattering (INS) investigations on polycrystalline Pr2Pd3Ge5. The polycrystalline compound exhibits two antiferromagnetic transitions, which were confirmed by heat capacity measurements. Magnetic Bragg peaks were observed in the magnetically ordered state, and the magnetic structure was determined to be a canted antiferromagnetic structure of ordered Pr3+ moments. In the paramagnetic state, crystal electric field (CEF) excitations were observed through INS, and a CEF level scheme was derived through analysis.
Article
Materials Science, Multidisciplinary
Chanhyeon Lee, Suheon Lee, Youngsu Choi, C. Wang, H. Luetkens, T. Shiroka, Zeehoon Jang, Young-Gui Yoon, Kwang-Yong Choi
Summary: We used various measurements, including magnetic susceptibility, muon-spin relaxation, and nuclear magnetic resonance, to study the spin dynamics of the quantum spin liquid candidate H3LiIr2O6. We identified two characteristic temperatures, Tg = 110 K and T* = 26 K, through analysis of the relaxation rates. Below Tg, there were distinct components of slower relaxation rate governed by gapped excitations and faster relaxation rate related to gapless excitations. We observed divergent magnetic susceptibility, power-law dependence of relaxation rate on temperature, and weakly activated behavior, indicating the coexistence of a disordered spin-liquid state and spin singlets with distributed gaps.
Article
Materials Science, Multidisciplinary
Vadim Grinenko, Rajib Sarkar, Shreenanda Ghosh, Debarchan Das, Zurab Guguchia, Hubertus Luetkens, Ilya Shipulin, Aline Ramires, Naoki Kikugawa, Yoshiteru Maeno, Kousuke Ishida, Clifford W. Hicks, Hans-Henning Klauss
Summary: Muon spin rotation/relaxation (μSR) and polar Kerr effect measurements provide evidence for a time-reversal symmetry breaking (TRSB) superconducting state in Sr2RuO4. However, the absence of a cusp in the superconducting transition temperature (Tc) vs stress and the absence of a resolvable specific heat anomaly at TRSB transition temperature (TTRSB) under uniaxial stress challenge a hypothesis of TRSB superconductivity. Recent μSR studies under pressure and with disorder indicate that the splitting between Tc and TTRSB occurs only when the structural tetragonal symmetry is broken. To further test such behavior, we measured Tc through susceptibility measurements and TTRSB through μSR, under uniaxial stress applied along a (110) lattice direction. We have obtained preliminary evidence for suppression of TTRSB below Tc, at a rate much higher than the suppression rate of Tc.