arXiv: Mesoscale and Nanoscale Physics
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#1M. N. ChernodubH-Index: 29
#2Yago Ferreiros (IMDEA: Madrid Institute for Advanced Studies)H-Index: 11
Last. María A. H. Vozmediano (CSIC: Spanish National Research Council)H-Index: 34
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The relation between thermal transport and gravity was highlighted in the seminal work by Luttinger in 1964, and has been extensively developed to understand thermal transport, most notably the thermal Hall effect. Here we review the novel concepts that relate thermal transport, the geometry of space-time and quantum field theory anomalies. We give emphasis to the cross-pollination between emergent ideas in condensed matter, notably Weyl and Dirac semimetals, and the understanding of gravitation...
#1A. ThurnH-Index: 2
#2Jochen BissingerH-Index: 4
Last. Jonathan J. FinleyH-Index: 51
view all 9 authors...
Nanowire lasers can be monolithically and site-selectively integrated onto silicon photonic circuits. To assess their full potential for ultrafast opto-electronic devices, a detailed understanding of their lasing dynamics is crucial. However, the roles played by their resonator geometry and the microscopic processes that mediate energy exchange between the photonic, electronic, and phononic systems are largely unexplored. Here, we apply femtosecond pump-probe spectroscopy to show that GaAs-AlGaA...
#1Chao-Xing LiuH-Index: 44
#2Shou-Cheng ZhangH-Index: 105
Last. Xiao-Liang QiH-Index: 73
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The quantum anomalous Hall effect is defined as a quantized Hall effect realized in a system without external magnetic field. Quantum anomalous Hall effect is a novel manifestation of topological structure in many-electron systems, and may have potential applications in future electronic devices. In recent years, quantum anomalous Hall effect has been proposed theoretically and realized experimentally. In this review article, we provide a systematic overview of the theoretical and experimental d...
#2Katharina ZeisslerH-Index: 14
Last. Serban LepadatuH-Index: 15
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Here we study the effect of an additional interfacial spin-transfer torque, as well as the well-established spin-orbit torque, on skyrmion collections - group of skyrmions dense enough that they are not isolated from one another - in ultrathin heavy metal / ferromagnetic multilayers, by comparing modelling with experimental results. Using a skyrmion collection with a range of skyrmion diameters, we study the dependence of the skyrmion Hall angle on diameter and velocity. As for an isolated skyrm...
#1Thomas A. LeonardH-Index: 2
#2Samuel LiuH-Index: 2
Last. Jean Anne C. IncorviaH-Index: 11
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In neuromorphic computing, artificial synapses provide a multi-weight conductance state that is set based on inputs from neurons, analogous to the brain. Additional properties of the synapse beyond multiple weights can be needed, and can depend on the application, requiring the need for generating different synapse behaviors from the same materials. Here, we measure artificial synapses based on magnetic materials that use a magnetic tunnel junction and a magnetic domain wall. By fabricating lith...
#1S. TchoumakovH-Index: 7
#2Jérôme CayssolH-Index: 18
Last. Adolfo G. GrushinH-Index: 31
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The effect by which light focuses upon entering a medium with a negative refractive index, known as Veselago lensing, may enable optical imaging below the diffraction limit. Similarly, focusing electrons across a pn-junction could realize a technologically promising electronic Veselago lens. However, its scope remains limited by the lack of three-dimensional platforms and its insensitivity to computational degrees of freedom, like spin or chirality. Here we propose a single-material three-dimens...
#1Steffen WittrockH-Index: 6
#2S. PernaH-Index: 6
Last. Vincent CrosH-Index: 62
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The emergence of exceptional points (EPs) in the parameter space of a (2D) eigenvalue problem is studied in a general sense in mathematical physics. In coupled systems, it gives rise to unique physical phenomena upon which novel approaches for the development of seminal types of highly sensitive sensors shall leverage their fascinating properties. Here, we demonstrate at room temperature the emergence of EPs in coupled spintronic nano-oscillators, coming along with the observation of amplitude d...
#1Thibaud Louvet (ECL: École Centrale de Lyon)
#2Pierre DelplaceH-Index: 17
Last. David CarpentierH-Index: 23
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Linear crossing of energy bands occur in a wide variety of materials. In this paper we address the question of the quantization of the Berry winding characterizing the topology of these crossings in dimension D=2 Based on the historical example of 2bands crossing occuring in graphene, we propose to relate these Berry windings to the topological Chern number of a D=3dimensional extension of these crossings. This dimensional embedding is obtained through a choice of a gap-opening potentia...
#1Laurence CochraneH-Index: 2
#2Theodor LundbergH-Index: 5
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Josephson parametric amplifiers (JPAs) approaching quantum-limited noise performance have been instrumental in enabling high fidelity readout of superconducting qubits and, recently, semiconductor quantum dots (QDs). We propose that the quantum capacitance arising in electronic two-level systems (the dual of Josephson inductance) can provide an alternative dissipation-less non-linear element for parametric amplification. We experimentally demonstrate phase-sensitive parametric amplification usin...
#1Bo Peng (University of Cambridge)H-Index: 42
#2Adrien Bouhon (Stockholm University)
Last. Robert-Jan Slager (University of Cambridge)H-Index: 19
view all 4 authors...
Topological phases of matter have revolutionised the fundamental understanding of band theory and hold great promise for next-generation technologies such as low-power electronics or quantum computers. Single-gap topologies have been extensively explored, and a large number of materials have been theoretically proposed and experimentally observed. These ideas have recently been extended to multi-gap topologies with band nodes that carry non-Abelian charges, characterised by invariants that arise...
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