Article
Astronomy & Astrophysics
D. Fernandez-Arenas, E. Carrasco, R. Terlevich, E. Terlevich, R. Amorin, F. Bresolin, R. Chavez, A. L. Gonzalez-Moran, D. Rosa-Gonzalez, Y. D. Mayya, O. Vega, J. Zaragoza-Cardiel, J. Mendez-Abreu, R. Izazaga-Perez, A. Gil de Paz, J. Gallego, J. Iglesias-Paramo, M. L. Garcia-Vargas, P. Gomez-Alvarez, A. Castillo-Morales, N. Cardiel, S. Pascual, A. Perez-Calpena
Summary: We conducted a spatially resolved spectroscopic study on the metal poor H ii galaxy J084220+115000 using MEGARA Integral Field Unit observations at the Gran Telescopio Canarias. Gas metallicity was estimated using the direct method for oxygen, nitrogen, and helium, revealing a mean value of 12 + log (O/H) = 8.03 +/- 0.06, and integrated electron density and temperature of approximately 161 cm(-3) and 15400 K, respectively. The metallicity distribution showed a large range, with values ranging from 7.69 +/- 0.06 to 8.42 +/- 0.05, indicating unusual characteristics for a dwarf star-forming galaxy. The data supported a possible scenario of an ongoing interaction triggering multiple star-forming regions within two dominant clumps.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
P. Vermot, B. Barna, S. Ehlerova, M. R. Morris, J. Palous, R. Wunsch
Summary: By observing and comparing three regions of NGC 1068, researchers found that they have similar characteristics and belong to the same class of objects. They also determined that these regions are where the jet from the active galactic nucleus impacts massive molecular clouds.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
N. Kovakkuni, F. Lelli, P-A Duc, M. Boquien, J. Braine, E. Brinks, V. Charmandaris, F. Combes, J. Fensch, U. Lisenfeld, S. S. McGaugh, J. C. Mihos, M. S. Pawlowski, Y. Revaz, P. M. Weilbacher
Summary: Research reveals that some star-forming regions in tidal dwarf galaxies (TDGs) resemble normal spiral galaxies, while others exhibit characteristics of extreme starbursts.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Xiaoyu Xu, Junfeng Wang
Summary: The Seyfert 1 galaxy NGC 7469 is found to have an ionized gas outflow in its central region. Using MUSE and Chandra observations, a spatially resolved study of the galaxy reveals the presence of a starburst wind around the circumnuclear ring and an AGN-driven outflow extending to 2 kiloparsecs from the nucleus. The estimated kinetic coupling efficiency of the AGN outflow is found to be lower than expected.
ASTROPHYSICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
R. A. Riffel, T. Storchi-Bergmann, R. Riffel, M. Bianchin, N. L. Zakamska, D. Ruschel-Dutra, M. C. Bentz, L. Burtscher, D. M. Crenshaw, L. G. Dahmer-Hahn, N. Z. Dametto, R. Davies, M. R. Diniz, T. C. Fischer, C. M. Harrison, V Mainieri, M. Revalski, A. Rodriguez-Ardila, D. J. Rosario, A. J. Schonell
Summary: We present the kinematics of hot molecular gas and warm ionized gas for 33 nearby X-ray selected active galaxies using the Gemini near-infrared integral field spectrograph. We find that 94% of the objects exhibit kinematically disturbed regions in the ionized gas, while 76% show such regions in the hot molecular gas. The outflows are interpreted as being produced by radiation-pressure in low-density environments, with possible contribution from shocks.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Jianan Li, Bram P. Venemans, Fabian Walter, Roberto Decarli, Ran Wang, Zheng Cai
Summary: This study presents high spatial resolution observations of the interstellar medium in the host galaxy of the quasar J0305-3150, revealing the spatial distribution and kinematics of gas in different phases. The research findings suggest that CO and dust continuum trace the same gas component, while [C ii]158 mu m traces a more extended one, with a possible decrease in dust optical depth with increasing radius.
ASTROPHYSICAL JOURNAL
(2022)
Article
Chemistry, Physical
Saumyak Mukherjee, Lars Schaefer
Summary: This Perspective discusses recent developments and applications of computational methods that provide a spatially resolved map of hydration thermodynamics in biomolecular systems, offering atomic-level insights for interpreting experimental observations.
JOURNAL OF PHYSICAL CHEMISTRY B
(2022)
Article
Chemistry, Physical
Leonard P. Heinz, Helmut Grubmuller
Summary: The study presents a new method called Per|Mut, which utilizes permutation reduction and mutual information expansion to address the sampling problem of hydration entropy. The method was tested on various systems, including an argon system, solvated n-alkanes, and solvated octanol.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2021)
Editorial Material
Biochemical Research Methods
Jennie L. Close, Brian R. Long, Hongkui Zeng
Summary: Spatially resolved transcriptomics has great potential in unraveling the organization of brain cell types and their relationship with connectivity, circuit dynamics, behavior, and disease, but technical challenges need to be overcome to fully realize its potentials.
Article
Chemistry, Physical
Hanwei Hu, Xuewen Zhang, Xinyu Zhang, Lishu Wu, Vanessa Li Zhang, Silin He, Guangchao Shi, Ting Yu, Jingzhi Shang
Summary: In this study, angle-resolved reflection (ARR) spectroscopy was used to investigate the spectral features of A, B, and interlayer excitons in monolayer and bilayer MoS2. The study revealed the interactions between these excitons and different photonic substrates. The findings contribute to the understanding of light-matter interactions in 2D semiconductors and provide insights for the design of photonic devices.
Editorial Material
Biochemical Research Methods
Vivien Marx
Summary: Nature Methods has named spatially resolved transcriptomics as Method of the Year 2020.
Article
Multidisciplinary Sciences
Shambavi Ganesh, Thomas Hu, Eric Woods, Mayar Allam, Shuangyi Cai, Walter Henderson, Ahmet F. Coskun
Summary: Researchers presented a three-dimensional spatially resolved metabolomic profiling framework (3D-SMF) to map out the spatial organization of metabolic fragments and protein signatures in immune cells of human tonsils. Various analyses were conducted to explore the relationships between metabolic and cellular features, revealing spatially distinct lipidomic fragment distributions in lymphatic tissue. The 3D-SMF pipeline impacts the study of immune cells in health and disease.
Article
Chemistry, Multidisciplinary
Robert Wallauer, Raul Perea-Causin, Lasse Muenster, Sarah Zajusch, Samuel Brem, Jens Guedde, Katsumi Tanimura, Kai-Qiang Lin, Rupert Huber, Ermin Malic, Ulrich Hoefer
Summary: The study successfully resolved the dynamics of dark exciton formation in monolayer WS2 using advanced experimental techniques combined with theoretical research, and observed the details of exciton formation.
Article
Physics, Fluids & Plasmas
Sandeep Kumar, Anna Julia Poser, Manuel Schoettler, Uwe Kleinschmidt, Wieland Dietrich, Johannes Wicht, Martin French, Ronald Redmer
Summary: This study investigates ionization and transport processes in partially ionized multicomponent plasmas by calculating plasma composition and electronic transport properties. The results suggest that higher temperatures in hot Jupiter atmospheres may boost conductivity and Ohmic heating power, potentially explaining the observed inflation of certain planets like HD 209458b.
Article
Chemistry, Physical
Frida H. Roenning, Anirban Roy, Douglas S. Aaron, Matthew M. Mench
Summary: This study investigates mass transport limitations in electrolyzers using spatially-resolved current measurements, revealing non-uniform current distribution caused by restricted liquid water transport. The research also finds that different architectures and porous media affect polarization in different regions of the active area.
JOURNAL OF POWER SOURCES
(2022)
Article
Physics, Multidisciplinary
Alexander Stegmaier, Stefan Imhof, Tobias Helbig, Tobias Hoefmann, Ching Hua Lee, Mark Kremer, Alexander Fritzsche, Thorsten Feichtner, Sebastian Klembt, Sven Hofling, Igor Boettcher, Ion Cosma Fulga, Libo Ma, Oliver G. Schmidt, Martin Greiter, Tobias Kiessling, Alexander Szameit, Ronny Thomale
Summary: Using electric circuit networks, we studied topological states of matter in non-Hermitian systems with parity-time symmetry and chiral symmetry. The impact of PT-symmetric gain and loss on localized edge and defect states was analyzed, revealing distinct properties of topological edge states and defect states. Our findings provide insights into future routes for topological defect engineering and tuning in non-Hermitian systems of arbitrary dimension.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Tejas Kotwal, Fischer Moseley, Alexander Stegmaier, Stefan Imhof, Hauke Brand, Tobias Kiessling, Ronny Thomale, Henrik Ronellenfitsch, Joern Dunkel
Summary: The transfer of topological concepts from quantum world to classical mechanical and electronic systems has opened new approaches to protected information transmission and wave guidance. By combining key ideas from topological circuits and active matter research, active topolectrical circuits that can self-excite protected global signal patterns have been developed. Through nonlinear ATCs, self-organized protected edge oscillations have been theoretically predicted and experimentally confirmed, providing a robust platform for developing high-dimensional autonomous electrical circuits with topologically protected functionalities.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Multidisciplinary Sciences
Saquib Shamim, Wouter Beugeling, Pragya Shekhar, Kalle Bendias, Lukas Lunczer, Johannes Kleinlein, Hartmut Buhmann, Laurens W. Molenkamp
Summary: Researchers have successfully demonstrated the quantized spin Hall resistance in HgTe quantum wells alloyed with magnetic Mn atoms at very low temperatures, due to the Kondo screening effect. This work lays the foundation for future investigations into magnetically doped quantum spin Hall materials and the realization of chiral Majorana fermions.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Saquib Shamim, Pragya Shekhar, Wouter Beugeling, Jan Bottcher, Andreas Budewitz, Julian-Benedikt Mayer, Lukas Lunczer, Ewelina M. Hankiewicz, Hartmut Buhmann, Laurens W. Molenkamp
Summary: This study reports the absence of transport gap in disordered two dimensional topological insulators at high magnetic fields. It is observed that at larger fields, only the quantum Hall edge channel with transverse resistance close to h/e(2) exists.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Applied
L. Scheffler, J. Werther, K. Gas, C. Schumacher, C. Gould, M. Sawicki, J. Kleinlein, L. W. Molenkamp
Summary: This study presents a detailed investigation on the influence of molecular beam epitaxial growth conditions on the structural and magnetic characteristics of CuMnSb films on lattice matched GaSb. By varying the Mn and Sb fluxes, materials with different elemental compositions were obtained. The study found that the closest-to-stoichiometric composition, where the Neel temperature attains its maximum values, is achieved when the Mn to Sb flux ratio is approximately 1.24. Mn-related structural defects are believed to be the driving force behind changes in the vertical lattice parameter.
APPLIED PHYSICS LETTERS
(2022)
Article
Multidisciplinary Sciences
Patrick M. Lenggenhager, Alexander Stegmaier, Lavi K. Upreti, Tobias Hofmann, Tobias Helbig, Achim Vollhardt, Martin Greiter, Ching Hua Lee, Stefan Imhof, Hauke Brand, Tobias Kiessling, Igor Boettcher, Titus Neupert, Ronny Thomale, Tomas Bzdusek
Summary: The authors demonstrate how to emulate spaces with negative curvature using an electric circuit network and verify the hyperbolic nature of the model. They show that the spectral ordering of Laplacian eigenstates in negatively curved spaces is universally different from that in flat spaces. The presented techniques provide a versatile platform to investigate classical and quantum dynamics in negatively curved spaces.
NATURE COMMUNICATIONS
(2022)
Article
Optics
Klaas-Jan Tielrooij, Alessandro Principi, David Saleta Reig, Alexander Block, Sebin Varghese, Steffen Schreyeck, Karl Brunner, Grzegorz Karczewski, Igor Ilyakov, Oleksiy Ponomaryov, Thales V. A. G. de Oliveira, Min Chen, Jan-Christoph Deinert, Carmen Gomez Carbonell, Sergio O. Valenzuela, Laurens W. Molenkamp, Tobias Kiessling, Georgy Astakhov, Sergey Kovalev
Summary: Researchers have achieved room-temperature terahertz harmonic generation in Bi2Se3 topological insulators and topological-insulator-grating metamaterial structures, obtaining a two orders of magnitude improvement in power compared to graphene samples.
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Multidisciplinary Sciences
Anffany Chen, Hauke Brand, Tobias Helbig, Tobias Hofmann, Stefan Imhof, Alexander Fritzsche, Tobias Kieling, Alexander Stegmaier, Lavi K. Upreti, Titus Neupert, Tomas Bzdusek, Martin Greiter, Ronny Thomale, Igor Boettcher
Summary: In this study, we introduce and experimentally realize hyperbolic matter as a paradigm for topological states using topolectrical circuit networks with a complex-phase circuit element. We confirm hyperbolic band theory through an unprecedented numerical survey of finite hyperbolic lattices. Our work demonstrates the implementation of hyperbolic graphene as an example of topologically nontrivial hyperbolic matter. This research sets the stage for realizing more complex forms of hyperbolic matter and provides a key ingredient for future experimental simulation of various Hamiltonians with topological ground states.
NATURE COMMUNICATIONS
(2023)
Article
Physics, Applied
C. Fuchs, M. Hofer, L. Fuerst, S. Shamim, T. Kiessling, H. Buhmann, L. W. Molenkamp
Summary: We present a setup for fast and low-bias DC transport measurements with mu s time resolution for high ohmic resistance semiconducting samples. We discuss the circuitry and instrumentation for the measurement approach and demonstrate the main measurement artifacts in typical measurements by means of circuit simulation. Based on this, we propose a simple protocol for eliminating the measurement artifacts reliably. We demonstrate the technique by successfully measuring the transitions between quantum Hall plateaus in HgTe quantum wells.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Arya Thenapparambil, Graciely Elias dos Santos, Chang-An Li, Mohamed Abdelghany, Wouter Beugeling, Hartmut Buhmann, Charles Gould, Song-Bo Zhang, Bjorn Trauzettel, Laurens W. Molenkamp
Summary: Fluctuations in planar magnetotransport in topological HgTe structures are caused by tilted Dirac cones and the formation of charge puddles. The tilted Dirac cones are due to the mix of the Zeeman term and quadratic contributions to the dispersion relation. A network model is developed to mimic the transport of tilted Dirac fermions in the landscape of charge puddles, and it captures the essential features of the experimental data. This model is relevant for interpreting planar magnetotransport in various topological and small bandgap materials.
Article
Materials Science, Multidisciplinary
A. V. Stier, C. J. Meining, V. R. Whiteside, B. D. McCombe, E. I. Rashba, P. Grabs, L. W. Molenkamp
Summary: In sensitive terahertz laser photoresponse measurements, we observed remarkable multiple-line electron spin-resonance spectra in the two-dimensional electron gas of an asymmetric InAs quantum well in the integer quantum Hall effect regime. The observed behavior of multiple sharp features and their splitting can be explained by strong spin orbit coupling effects, effective magnetic fields associated with quantum Hall edge currents, and the behavior of edge channels near the center of the odd plateaus. These results demonstrate the possibility of probing the widths of quantum Hall edge channels and manipulating spins with THz photons having wavelengths several orders of magnitude larger than the edge-channel widths.
Article
Physics, Multidisciplinary
Hendrik Hohmann, Tobias Hofmann, Tobias Helbig, Stefan Imhof, Hauke Brand, Lavi K. Upreti, Alexander Stegmaier, Alexander Fritzsche, Tobias Mueller, Udo Schwingenschloegl, Ching Hua Lee, Martin Greiter, Laurens W. Molenkamp, Tobias Kiessling, Ronny Thomale
Summary: We observe a localized cnoidal (LCn) state in an electric circuit network, formed from the interplay of nonlinearity and topology inherent to a Su-Schrieffer-Heeger (SSH) chain of inductors. The LCn state is a distorted version of the topological SSH boundary state, showing a decrease in cnoidal eccentricity from edge to bulk in the nonlinear regime. Varicap diodes serve as voltage-dependent capacitors in the circuit, creating a nonlinear on-site potential which leads to the voltage response following the Korteweg-de Vries equation for sinusoidal voltage excitation near midgap frequency.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
J. Zelezny, Z. Fang, K. Olejnik, J. Patchett, F. Gerhard, C. Gould, L. W. Molenkamp, C. Gomez-Olivella, J. Zemen, T. Tichy, T. Jungwirth, C. Ciccarelli
Summary: This research investigates spin-orbit torque and unidirectional magnetoresistance in the room-temperature ferromagnet NiMnSb with inversion asymmetry. The competition of Rashba- and Dresselhaus-type spin-orbit couplings plays a crucial role in determining the effects, and commonly used approaches for interpreting experiments may not be directly applicable. The unidirectional magnetoresistance has both longitudinal and transverse components, which complicates its separation from thermoelectric contributions in experimental techniques.
Article
Physics, Multidisciplinary
Tobias Hofmann, Tobias Helbig, Frank Schindler, Nora Salgo, Marta Brzezinska, Martin Greiter, Tobias Kiessling, David Wolf, Achim Vollhardt, Anton Kabasi, Ching Hua Lee, Ante Bilusic, Ronny Thomale, Titus Neupert
PHYSICAL REVIEW RESEARCH
(2020)
Article
Physics, Multidisciplinary
Daniel Steil, Jakob Walowski, Felicitas Gerhard, Tobias Kiessling, Daniel Ebke, Andy Thomas, Takahide Kubota, Mikihiko Oogane, Yasuo Ando, Johannes Otto, Andreas Mann, Moritz Hofherr, Peter Elliott, John Kay Dewhurst, Guenter Reiss, Laurens Molenkamp, Martin Aeschlimann, Mirko Cinchetti, Markus Muenzenberg, Sangeeta Sharma, Stefan Mathias
PHYSICAL REVIEW RESEARCH
(2020)
