Blar i NTNU Open på forfatter "Belzig, Wolfgang"
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Antiferromagnetic magnons as highly squeezed Fock states underlying quantum correlations
Kamra, Akashdeep; Thingstad, Even; Rastelli, Gianluca; Duine, Rembert A.; Brataas, Arne; Belzig, Wolfgang; Sudbø, Asle (Peer reviewed; Journal article, 2019)Employing the concept of two-mode squeezed states from quantum optics, we demonstrate a revealing physical picture for the antiferromagnetic ground state and excitations. Superimposed on a Néel ordered configuration, a ... -
Exchange-enhanced ultrastrong magnon-magnon coupling in a compensated ferrimagnet
Liensberger, Lukas; Kamra, Akashdeep; Maier-Flaig, Hannes; Gepraegs, Stephan; Erb, Andreas; Goennenwein, Sebastian; Gross, Rudolf; Belzig, Wolfgang; Huebl, Hans; Weiler, Mathias (Peer reviewed; Journal article, 2019)We experimentally study the spin dynamics in a gadolinium iron garnet single crystal using broadband ferromagnetic resonance. Close to the ferrimagnetic compensation temperature, we observe ultrastrong coupling of clockwise ... -
Phase-controlled spin and charge currents in a superconductor-ferromagnet hybrid
Rezaei, Ali; Hussein, Robert; Kamra, Akashdeep; Belzig, Wolfgang (Peer reviewed; Journal article, 2020)We investigate spin-dependent quasiparticle and Cooper-pair transport through a central node interfaced with two superconductors and two ferromagnets. We demonstrate that voltage biasing of the ferromagnetic contacts induces ... -
Prediction of a paramagnetic Meissner effect in voltage-biased superconductor/normal-metal bilayers
Ouassou, Jabir Ali; Belzig, Wolfgang; Linder, Jacob (Peer reviewed; Journal article, 2020)Conventional superconductors respond to external magnetic fields by generating diamagnetic screening currents. However, theoretical work has shown that one can engineer systems where the screening current is paramagnetic, ... -
Spin current cross-correlations as a probe of magnon coherence
Bender, Scott A.; Kamra, Akashdeep; Belzig, Wolfgang; Duine, Rembert (Peer reviewed; Journal article, 2019)Motivated by the important role of the normalized second-order coherence function, often called g(2), in the field of quantum optics, we propose a method to determine magnon coherence in solid-state devices. Namely, we ...