Article
Mechanics
Meisam Pourali, Martin Kroger, Jan Vermant, Patrick D. Anderson, Nick O. Jaensson
Summary: This study investigates the flow of viscous interfaces carrying an insoluble surface active material, exploring the complex interplay between Marangoni stresses, compressibility, and surface shear and dilatational viscosities. By conducting numerical simulations on particle probes, the relationship between drag and interfacial properties necessary for microrheology is quantified. The research reveals the intimate coupling between bulk and interfacial flows, demonstrating the effects of different physical factors on the velocity field and drag coefficient.
Article
Physics, Multidisciplinary
Ge Zhang, Sean A. Ridout, Andrea J. Liu
Summary: This study investigates avalanches of particle rearrangements in jammed soft disks under quasistatic shear. By introducing a framework for understanding the statistics of avalanches, the research identifies a correlation between softness and rearrangements, showing that softness serves as a useful proxy for local yield strain. The findings suggest that elastoplastic models should incorporate a fully tensorial strain field to include the effects of changes in local yield strain due to rearrangements.
Article
Multidisciplinary Sciences
I. Bitharas, N. Parab, C. Zhao, T. Sun, A. D. Rollett, A. J. Moore
Summary: In this study, the authors directly investigated the impact of laser-material interaction on laser powder bed fusion (LPBF) process using simultaneous in-situ synchrotron x-ray and schlieren imaging. By quantifying the morphological changes during the process, the instability of the process was revealed, and the effect of the powder layer on process stability was explored. These findings contribute to the design of process windows at higher power and speed, and provide a potential method for monitoring process stability.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Nathan C. Keim, Dani Medina
Summary: The study investigates how to mechanically anneal a sample to minimize memory content and introduces a method to characterize rearrangements within the sample. Experimental results show that a ring-down protocol can achieve a stable state without discernible memories.
Article
Physics, Multidisciplinary
Ze Cheng
Summary: The study presents a superfluid state of vacancy motion in solid He-4, where vacancies sense an attractive effective interaction by exchanging virtual longitudinal acoustic phonons, leading to a Bardeen-Cooper-Schrieffer (BCS) condensation state. This first-order phase transition results in dressed vacancies and vacancy pairs, with the critical temperature potentially being the transition temperature of the supersolid state. The low-temperature expressions of vacancy heat capacity and vacancy number density in the BCS condensation state are derived.
Article
Polymer Science
Seung Heum Jeong, Soowon Cho, Chunggi Baig
Summary: This study presents a detailed analysis of the scaling behavior of chain rotation dynamics in shear flow for melt and dilute linear polymer systems. The results show that dilute systems with hydrodynamic interaction (HI) and excluded volume (EV) effects exhibit two distinct scaling behaviors of chain rotation time between the intermediate and strong flow regimes. In contrast, free-draining dilute polymer systems display a simpler single-scaling behavior throughout the intermediate-to-strong flow regimes. The combined HI and EV effects weaken the structural change of polymer chains and enhance chain rotation dynamics by disturbing chain stretch and alignment to the flow direction. The presence of intermolecular interactions between chains in melt systems leads to two distinct scaling behaviors of chain rotation time as well. The overall scaling behavior of chain rotation is determined by the kinematically stable angular regions near the flow direction, while the kinematically unstable angular regions exhibit affine chain rotation dynamics. This study provides important insights into the understanding of chain rotation dynamics in shear flow.
Article
Polymer Science
Hao Wang, Wan-Su Peng, Qi Wu, Yan Zhao, Shi-Tai Wang, Yi Yang, Jin-Rong Wu, Xiao-Liang Wang, Rong-Chun Zhang
Summary: There has been increasing interest in incorporating dynamic bonds into polymer materials to achieve multiple functionalities. However, the impact of dynamic bonds on polymer dynamics has been less explored. In this study, a self-healing solid-liquid elastomer (SLE) with abundant dynamic boron/oxygen dative bonds was investigated. The results showed that increasing the content of dynamic boron/oxygen dative bonds enhanced the structural and chain relaxation heterogeneity of the SLE. The study also revealed the impact of boron/oxygen dative bonds on Rouse dynamics.
CHINESE JOURNAL OF POLYMER SCIENCE
(2022)
Article
Physics, Multidisciplinary
Jaewon Choi, Alexey A. Zadorozhko, Jeakyung Choi, Eunseong Kim
Summary: The study on the second layer of He-4 films reveals that the superfluid density is independent of frequency, providing unequivocal evidence of genuine superfluidity. The phase diagram established in this work shows the coexistence of superfluid phase, hexatic density-wave correlation, and a registered solid phase. This suggests the second layer as a candidate for hosting two exotic quantum ground states, the spatially modulated superfluid and supersolid phases resulting from the interplay between superfluid and structural orders.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Multidisciplinary
Pedro H. H. de Freitas Pimenta, Daniel A. A. Stariolo
Summary: We conducted a numerical analysis of the relaxational dynamics of the Sherrington-Kirkpatrick spherical model with a non-disordered perturbation. The perturbation induces a phase transition from a spin glass to a ferromagnetic phase. Finite-size effects lead to a distinctive slow regime in the relaxation dynamics, and the extension of this regime depends on the system size and the strength of the perturbation. We characterized the statistics of the two largest eigenvalues and the gap between them, as well as the finite-size scaling of the energy relaxation. We hope this work will inspire further analytical research in this area.
Article
Chemistry, Physical
Lorenzo Paoloni, Assimo Maris
Summary: This paper discusses the solutions to the time-independent nuclear Schrodinger equation associated with the pseudorotational motion of three flexible cyclic molecules. It describes the structural relaxations related to the pseudorotational motion and provides solutions for the rovibrational Hamiltonian matrices taking into account the interplay between pseudorotational and rotational motions. The construction and diagonalization of the rovibrational Hamiltonian matrices using a Python program, as well as suitable algorithms for various calculations, are described and discussed.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Review
Immunology
Seung-Jin Kim, Dipendra Khadka, Jae Ho Seo
Summary: This article discusses the process of tumors adapting to adverse environments through communication with neighboring cells. Understanding the physiology of these tumors and their interaction with the tumor environment can help in developing promising tumor treatment strategies.
FRONTIERS IN IMMUNOLOGY
(2022)
Article
Chemistry, Physical
Ritika, T. J. Dhilip Kumar
Summary: In this study, quantum mechanical closed coupling scattering calculations are performed to investigate rotational transitions of C-2 due to collisions with He-3 and He-4. A new C-2-He potential energy surface computed at the CCSD(T)-F12b/aug-cc-pVQZ level of theory is utilized. The results show that the heavier He-4 isotope has a larger rotational quenching cross section compared to the 3He isotope. Wigner's threshold law is observed below 10(-1) cm(-1). The findings suggest that C-2 can be cooled by collisions with He-4 buffer gas.
CHEMICAL PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Ming-Ming Zhao, Bin-Bin Wang, Gao-Ren Wang, Bina Fu, Maksim Shundalau, Yong-Chang Han
Summary: By studying the He-4-He-4-Ne-20 collision system, the researchers have calculated the rates for the three-body recombination and collision-induced dissociation processes. It was found that He-4(2) (l = 0) is the dominant product of recombination at ultracold temperatures, with a rate significantly higher than the other three products.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Mechanics
Damien Barbier, Pedro H. de Freitas Pimenta, Leticia F. Cugliandolo, Daniel A. Stariolo
Summary: We revisit the gradient descent dynamics of the spherical Sherrington-Kirkpatrick model with finite number of degrees of freedom, identifying three time regimes of relaxation influenced by eigenvalue distribution and initial states effects.
JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT
(2021)
Article
Chemistry, Physical
Zhongda Zeng, Enderalp Yakaboylu, Mikhail Lemeshko, Tao Shi, Richard Schmidt
Summary: The study proposes a coherent state ansatz to describe angulons, which are quasiparticles formed by a quantum rotor dressed by excitations of a many-body bath. The properties of angulons, such as energies, quasiparticle weights, and spectral functions, are revealed, and a persistent decrease in the impurity's rotational constant is observed due to many-body dressing. The study also discusses rotational spectroscopy and takes into account initial-state interactions, revealing their impact on the excitation spectrum.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Michael R. Sinko, Sergio C. de la Barrera, Olivia Lanes, Kenji Watanabe, Takashi Taniguchi, Susheng Tan, David Pekker, Michael Hatridge, Benjamin M. Hunt
Summary: This study introduces a method to create zero-resistance contacts between 2D NbSe2 and 3D aluminum, behaving as Josephson junctions with large effective areas. By numerically solving Ginzburg-Landau equations, the supercurrent flow in 2D-3D superconducting structures is discussed and shows good agreement with experimental results. These findings demonstrate a crucial step towards a new generation of hybrid superconducting quantum circuits.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Multidisciplinary Sciences
T. Takenaka, K. Ishihara, M. Roppongi, Y. Miao, Y. Mizukami, T. Makita, J. Tsurumi, S. Watanabe, J. Takeya, M. Yamashita, K. Torizuka, Y. Uwatoko, T. Sasaki, X. Huang, W. Xu, D. Zhu, N. Su, J-G Cheng, T. Shibauchi, K. Hashimoto
Summary: Metal-organic frameworks (MOFs) provide a tunable platform for exploring new states of matter through self-assemblies of metal ions and organic ligands. The discovery of superconductivity in the π - d conjugated 2D MOF [Cu3(C6S6)](n) (Cu-BHT) with a critical temperature Tc of 0.25 kelvin raises questions about the nature of electron pairing. The unconventional superconductivity in Cu-BHT is believed to originate from electron correlations related to spin fluctuations of the kagome lattice, with an extremely low superfluid density.
Article
Chemistry, Multidisciplinary
Zheng Sun, Jonathan Beaumariage, Qiaochu Wan, Hassan Alnatah, Nicholas Hougland, Jessica Chisholm, Qingrui Cao, Kenji Watanabe, Takashi Taniguchi, Benjamin Matthew Hunt, Igor Bondarev, David Snoke
Summary: Research has shown that two-dimensional monolayer structures of transition metal dichalogenides can accommodate various high-order excitonic bound states, such as trions, biexcitons, and charged biexcitons. Experimental evidence and theoretical basis have revealed a new bound excitonic complex in a bilayer structure, consisting of two free carriers bound to an exciton. These four-carrier bound states, being charged bosons, could potentially be a new pathway to superconductivity.
Article
Multidisciplinary Sciences
Sergio C. de la Barrera, Qingrui Cao, Yang Gao, Yuan Gao, Vineetha S. Bheemarasetty, Jiaqiang Yan, David G. Mandrus, Wenguang Zhu, Di Xiao, Benjamin M. Hunt
Summary: Recent measurements in bilayers and trilayers of WTe2 have demonstrated signatures of ferroelectric switching, providing insights into polar ordering, ferroelectric transitions, and applications. The density of electrons and holes can be continuously tuned by an external gate voltage, allowing for the measurement of spontaneous polarization. The coexistence of free carriers and electrical polarization in ferroelectric metals has been explored using a capacitive method.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Multidisciplinary
K. Ishihara, T. Takenaka, Y. Miao, Y. Mizukami, K. Hashimoto, M. Yamashita, M. Konczykowski, R. Masuki, M. Hirayama, T. Nomoto, R. Arita, O. Pavlosiuk, P. Wisniewski, D. Kaczorowski, T. Shibauchi
Summary: The superconductivity in the non-centrosymmetric half-Heusler LuPdBi can be described by a mixture of isotropic even-parity singlet and anisotropic odd-parity septet pairing, with their ratio tunable by electron irradiation. Magnetotransport and penetration depth measurements reveal that irradiation leads to increased carrier concentrations and impurity scattering, resulting in a nonmonotonic change in the superconducting gap structure. These findings provide new insights into unconventional superconducting states in topological materials.
Article
Materials Science, Multidisciplinary
Minoru Yamashita, Shiori Sugiura, Akira Ueda, Shun Dekura, Taichi Terashima, Shinya Uji, Yoshiya Sunairi, Hatsumi Mori, Elena Zhilyaeva, Svetlana A. Torunova, Rimma N. Lyubovskaya, Natalia Drichko, Chisa Hotta
Summary: Magnetic susceptibility and magnetic torque measurements were carried out on the organic compound kappa-(BEDT-TTF)(2)Hg(SCN)(2)Br, revealing a potential ferromagnetic interaction of about 1/6 of the full spin moment of localized charges in the low-temperature insulating phase, possibly related to a dipole liquid. The study proposed a model involving antiferromagnetically interacting spin chains in adjacent charge-ordered domains coupled via fluctuating charges on a Mott-dimer at the boundary, indicating that charge fluctuations can induce weak ferromagnetic moments.
NPJ QUANTUM MATERIALS
(2021)
Article
Multidisciplinary Sciences
Minoru Yamashita, Yuki Sato, Yuichi Kasahara, Shigeru Kasahara, Takasada Shibauchi, Yuji Matsuda
Summary: The presence of a finite residual linear term in thermal conductivity at zero temperature in insulating magnets indicates the existence of gapless excitations of itinerant quasiparticles, as observed in some candidate materials of quantum spin liquids (QSLs).
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Felix Luepke, Dacen Waters, Anh D. Pham, Jiaqiang Yan, David G. Mandrus, Panchapakesan Ganesh, Benjamin M. Hunt
Summary: In this study, the topological nature of twisted bilayer WTe2 was investigated using scanning tunneling microscopy and spectroscopy (STM/STS). The characteristic spectroscopic signatures of the quantum spin Hall edge states were observed at the edges of the twisted bilayer. Through calculations, it was found that the topology of WTe2 bilayers can be engineered by adjusting the twist angle and interlayer interactions.
Article
Chemistry, Multidisciplinary
Qingrui Cao, Evan J. Telford, Avishai Benyamini, Ian Kennedy, Amirali Zangiabadi, Kenji Watanabe, Takashi Taniguchi, Cory R. Dean, Benjamin M. Hunt
Summary: We introduce a novel planar tunneling architecture based on metallic contacts embedded into hBN through-holes, and study the impact of tunnel-contact area and barrier strength on the single-particle density of states of NbSe2 and graphene. We demonstrate a crossover from diffusive to point contacts in NbSe2 devices with 0-layer hBN, and show that reducing the tunnel barrier thickness and area can suppress effects due to phonon-assisted tunneling and defects in the hBN barrier in graphene.
Article
Materials Science, Multidisciplinary
Shunichiro Kittaka, Yohei Kono, Kaito Tsunashima, Daisuke Kimoto, Makoto Yokoyama, Yusei Shimizu, Toshiro Sakakibara, Minoru Yamashita, Kazushige Machida
Summary: The Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state in the superconductor CeCoIn5 is characterized by two anomalies in the magnetostriction along the c axis, parallel to the magnetic-field orientation, while no anomaly is observed along the a-axis direction. This uniaxial expansion could be attributed to the FFLO modulation vector parallel to the applied magnetic field.
Article
Materials Science, Multidisciplinary
Yusei Shimizu, Shunichiro Kittaka, Yohei Kono, Toshiro Sakakibara, Kazushige Machida, Ai Nakamura, Dexin Li, Yoshiya Homma, Yoshiki J. Sato, Atsushi Miyake, Minoru Yamashita, Dai Aoki
Summary: This study investigates the magnetic response of UTe2 at low temperatures through dc magnetization and heat capacity measurements. The results reveal the presence of anomalous magnetic flux pinning effect in the superconducting state of UTe2, which is related to its peculiar electromagnetic response.
Article
Physics, Multidisciplinary
Hikaru Takeda, Jiancong Mai, Masatoshi Akazawa, Kyo Tamura, Jian Yan, Kalimuthu Moovendaran, Kalaivanan Raju, Raman Sankar, Kwang-Yong Choi, Minoru Yamashita
Summary: We investigate the thermal conductivity and thermal Hall conductivity in the cobalt-based honeycomb antiferromagnet Na2Co2TeO6. We observe finite thermal Hall conductivity in both directions below the Neel temperature and discover the emergence of topological bosonic excitations. Additionally, we find sign reversals in the field dependence of thermal Hall conductivity, indicating changes in the distribution of topological magnons. We also observe the presence of a magnetically ordered state breaking the symmetry in a specific field range.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Physics, Multidisciplinary
Masatoshi Akazawa, Hyun-Yong Lee, Hikaru Takeda, Yuri Fujima, Yusuke Tokunaga, Taka-hisa Arima, Jung Hoon Han, Minoru Yamashita
Summary: This study demonstrates the presence of topological transport by bosonic magnons in a lattice of magnetic skyrmions, which is governed by the Chern number of the lowest energy band. This finding lays a foundation for studying topological phenomena of other bosonic excitations.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Natalia Drichko, Shiori Sugiura, Minoru Yamashita, Akira Ueda, Shinya Uji, Nora Hassan, Yoshiya Sunairi, Hatsumi Mori, Elena Zhilyaeva, Svetlana Torunova, Rimma N. Lyubovskaya
Summary: This study discusses the coupling of charge and spin degrees of freedom in a material based on the BEDT-TTF molecule through magnetic property measurements at different temperatures. The observed charge and spin separation below 30 K and coupling below 24 K are significant for understanding the properties of quasi-two-dimensional Mott insulators.
Article
Physics, Multidisciplinary
J. Yan, Z. Z. Jiang, R. C. Xiao, W. J. Lu, W. H. Song, X. B. Zhu, X. Luo, Y. P. Sun, M. Yamashita
Summary: This study investigates the magnetotransport properties of EuIn2As2 through detailed magnetoresistance and Hall measurements, revealing anomalous Hall effect and large topological Hall effect, suggesting their origins and providing insights for realizing axion insulator states.
PHYSICAL REVIEW RESEARCH
(2022)