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Low-loss deposited dielectrics will benefit superconducting devices such as integrated superconducting spectrometers, superconducting qubits and kinetic inductance parametric amplifiers. Compared with planar structures, multi-layer structures such as microstrips are more compact and eliminate radiation loss at high frequencies. Multi-layer structures are most easily fabricated with deposited dielectrics, which typically exhibit higher dielectric loss than crystalline dielectrics. We measured the...
#1Danrui NiH-Index: 5
#2Zhiwei HuH-Index: 60
Last. Liu Hao TjengH-Index: 73
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Zeolites are so well known in real world applications and after decades of scientific study that they hardly need any intro-duction: their importance in chemistry cannot be overemphasized. Here we add to the remarkable properties that they dis-play by reporting our discovery that the simplest zeolite, sodalite, when doped with Cr3+ in the \b{eta}-cage, is a frustrated magnet. Soft X-ray absorption spectroscopy and magnetic measurements reveal that the Cr present is Cr(III). Cr(III), with its iso...
Van der Waals heterostructures (vdWHs) combine different layered materials with properties of interest,1 such as two-dimensional (2D) semimetals, semiconductors, magnets or superconductors. These heterostructures provide the possibility of engineering new materials with emergent functionalities that are not accessible in another way. Beyond inorganic 2D materials, layered molecular materials remain still rather unexplored, with only few examples regarding their isolation as atomically thin-layer...
#1Arka KarmakarH-Index: 3
#2Abdullah Al-MahboobH-Index: 15
Last. Keshav M. DaniH-Index: 19
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Type-II heterostructures (HSs) are essential components of modern electronic and optoelectronic devices. Earlier studies have found that in type-II transition metal dichalcogenide (TMD) HSs, the dominating carrier relaxation pathway is the interlayer charge transfer (CT) mechanism. Here, this report shows that, in a type-II HS formed between monolayers of MoSe2 and ReS2, nonradiative energy transfer (ET) from higher to lower work function material (ReS2 to MoSe2) dominates over the traditional C...
#1Martin HenneckeH-Index: 3
#2Daniel SchickH-Index: 15
Last. Bastian PfauH-Index: 21
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We report on time- and angle-resolved transverse magneto-optical Kerr effect spectroscopy in the soft x-ray range that, by analysis via polarization-dependent magnetic scattering simulations, allows to determine the spatio-temporal and element-specific evolution of femtosecond laser-induced spin dynamics in nanostructured magnetic materials. We demonstrate this ability on a ferrimagnetic GdFe film enclosed by Ta and Pt cap and seed layers, revealing a depth-dependent de- and remagnetization with...
#1John C. ThomasH-Index: 12
#2Antonio RossiH-Index: 13
Last. Edward S. BarnardH-Index: 24
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Point defect identification in two-dimensional materials enables an understanding of the local environment within a given system, where scanning probe microscopy that takes advantage of hyperspectral tunneling bias spectroscopy acquisition can both map and identify the atomic and electronic landscape. Here, dense spectroscopic volume is collected autonomously via Gaussian process regression, where convolutional neural networks are used in tandem for defect identification. Monolayer semiconductor...
Metastable alloys with transformation/twinning-induced plasticity (TRIP/TWIP) can overcome the strength-ductility trade-off in structural materials. Originated from the development of traditional alloys, the intrinsic stacking fault energy (ISFE) has been relied to tailor TRIP/TWIP in high-entropy alloys (HEA), but with limited quantitative success. Herein, we demonstrate a new strategy for designing metastable HEAs and validate its effectiveness by discovering seven new alloys with experimental...
#1W. Román AcevedoH-Index: 5
#2Myriam H. AguirreH-Index: 32
Last. Diego RubiH-Index: 18
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Memristive systems emerge as strong candidates for the implementation of Resistive Random Access Memories (RRAM) and neuromorphic computing devices, as they can mimic the electrical analog behavior or biological synapses. In addition, complementary functionalities such as memcapacitance could significantly improve the performance of bio-inspired devices in key issues such as energy consumption. However, the physics of mem-systems is not fully understood so far, hampering their large-scale implem...
#1Vidar SkogvollH-Index: 1
#2Luiza AnghelutaH-Index: 12
Last. Jorge ViñalsH-Index: 26
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We present a general method to compute the dislocation density tensor and its evolution from the configuration of a spatially periodic order parameter associated with a given crystal symmetry. The method is applied to a phase field crystal model (PFC) of a bcc lattice, and used to investigate the shrinkage of a dislocation loop. The dislocation velocity is determined by the dynamics of the order parameter, and we have shown that the general expression predicts the overdamped motion induced by a ...
A theoretical study is presented of the effect of an in-plane magnetic exchange field on the band structure of centrosymmetric films of noble metals and topological insulators. Based on an ab initio relativistic \mathbf{k}\cdot\mathbf{p}theory, a minimal effective model is developed that describes two coupled copies of a Rashba or Dirac electronic system residing at the opposite surfaces of the film. The coupling leads to a structural gap at \bar{\Gamma}and causes an exotic redistribution ...
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