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Bernal Arango, F.A. (author), Alpeggiani, F. (author), Conteduca, Donato (author), Opheij, A. (author), Chen, Aobo (author), Abdelrahman, Mohamed I. (author), Krauss, Thomas F. (author), Alù, Andrea (author), Kuipers, L. (author)Near-field scanning optical microscopy is a powerful technique for imaging below the diffraction limit, which has been extensively used in biomedical imaging and nanophotonics. However, when the electromagnetic fields under measurement are strongly confined, they can be heavily perturbed by the presence of the near-field probe itself. Here,...journal article 2022
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Wang, Y. (author), McCandless, Gregory T. (author), Wang, Xiaoping (author), Thanabalasingam, Kulatheepan (author), Wu, H. (author), Bouwmeester, D. (author), van der Zant, H.S.J. (author), Ali, M.N. (author), Chan, C.L. (author)The Kagome lattice is an important fundamental structure in condensed matter physics for investigating the interplay of electron correlation, topology, and frustrated magnetism. Recent work on Kagome metals in the AV3Sb5 (A = K, Rb, and Cs) family has shown a multitude of correlation-driven distortions, including symmetry breaking charge...journal article 2022
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Bertelli, I. (author), Simon, B.G. (author), Yu, T. (author), Aarts, Jan (author), Bauer, G.E. (author), Blanter, Y.M. (author), van der Sar, T. (author)Spin waves in magnetic insulators are low-damping signal carriers that can enable a new generation of spintronic devices. The excitation, control, and detection of spin waves by metal electrodes is crucial for interfacing these devices to electrical circuits. As such, it is important to understand metal-induced damping of spin-wave transport,...journal article 2021
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Tan, Huatang (author), Li, J. (author)We propose a deterministic scheme for establishing hybrid Einstein-Podolsky-Rosen (EPR) entanglement channel between a macroscopic mechanical oscillator and a magnon mode in a distant yttrium-iron-garnet (YIG) sphere across about 10 GHz of frequency difference. The system consists of a driven electromechanical cavity which is unidirectionally...journal article 2021
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Chepiga, N. (author), Mila, Frédéric (author)The recent investigation of chains of Rydberg atoms has brought back the problem of commensurate-incommensurate transitions into the focus of current research. In two-dimensional classical systems or in one-dimensional quantum systems, the commensurate melting of a period-p phase with p larger than 4 is known to take place through an...journal article 2021
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Simon, B.G. (author), Kurdi, S. (author), La, Helena (author), Bertelli, I. (author), Carmiggelt, J.J. (author), Ruf, M.T. (author), de Jong, N. (author), van den Berg, J.H. (author), Katan, A.J. (author), van der Sar, T. (author)Controlling magnon densities in magnetic materials enables driving spin transport in magnonic devices. We demonstrate the creation of large, out-of-equilibrium magnon densities in a thin-film magnetic insulator via microwave excitation of coherent spin waves and subsequent multimagnon scattering. We image both the coherent spin waves and the...journal article 2021
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Komen, I. (author), van Heijst, S.E. (author), Conesa Boj, S. (author), Kuipers, L. (author)Due to their intriguing optical properties, including stable and chiral excitons, two-dimensional transition metal dichalcogenides (2D-TMDs) hold the promise of applications in nanophotonics. Chemical vapor deposition (CVD) techniques offer a platform to fabricate and design nanostructures with diverse geometries. However, the more exotic the...journal article 2021
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Díaz-Escobar, Evelyn (author), Bauer, T.A. (author), Pinilla-Cienfuegos, Elena (author), Barreda, Ángela I. (author), Griol, Amadeu (author), Kuipers, L. (author), Martínez, Alejandro (author)High-index nanoparticles are known to support radiationless states called anapoles, where dipolar and toroidal moments interfere to inhibit scattering to the far field. In order to exploit the striking properties arising from these interference conditions in photonic integrated circuits, the particles must be driven in-plane via integrated...journal article 2021
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Maduro, L.A. (author), Noordam, M.L. (author), Bolhuis, M. (author), Kuipers, L. (author), Conesa Boj, S. (author)The fabrication of 2D materials, such as transition metal dichalcogenides (TMDs), in geometries beyond the standard platelet-like configuration exhibits significant challenges which severely limit the range of available morphologies. These challenges arise due to the anisotropic character of their bonding van der Waals out-of-plane while...journal article 2021
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Carmiggelt, J.J. (author), Dreijer, Olaf C. (author), Dubs, Carsten (author), Surzhenko, Oleksii (author), van der Sar, T. (author)Yttrium iron garnet (YIG) is a magnetic insulator with record-low damping, allowing spin-wave transport over macroscopic distances. Doping YIG with gallium ions greatly reduces the demagnetizing field and introduces a perpendicular magnetic anisotropy, which leads to an isotropic spin-wave dispersion that facilitates spin-wave optics and spin...journal article 2021
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Hernandez Rueda, F.J. (author), Noordam, M.L. (author), Komen, I. (author), Kuipers, L. (author)Currently, the nonlinear optical properties of 2D materials are attracting the attention of an ever-increasing number of research groups due to their large potential for applications in a broad range of scientific disciplines. Here, we investigate the interplay between nonlinear photoluminescence (PL) and several degenerate and nondegenerate...journal article 2021
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Arora, S. (author), Bauer, T.A. (author), Barczyk, René (author), Verhagen, Ewold (author), Kuipers, L. (author)Topological on-chip photonics based on tailored photonic crystals (PhCs) that emulate quantum valley-Hall effects has recently gained widespread interest owing to its promise of robust unidirectional transport of classical and quantum information. We present a direct quantitative evaluation of topological photonic edge eigenstates and their...journal article 2021
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Malossi, Nicola (author), Piergentili, Paolo (author), Li, J. (author), Serra, E. (author), Natali, Riccardo (author), Di Giuseppe, Giovanni (author), Vitali, David (author)We present a complete theory for laser cooling of a macroscopic radio-frequency LC electrical circuit by means of an optoelectromechanical system, consisting of an optical cavity dispersively coupled to a nanomechanical oscillator, which is in turn capacitively coupled to the LC circuit of interest. The driven optical cavity cools the...journal article 2021
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Veldman, L.M. (author), Farinacci, L.S.M. (author), Rejali, R. (author), Broekhoven, R. (author), Gobeil, J. (author), Coffey Blanco, D. (author), Ternes, Markus (author), Otte, A. F. (author)Full insight into the dynamics of a coupled quantum system depends on the ability to follow the effect of a local excitation in real-time. Here, we trace the free coherent evolution of a pair of coupled atomic spins by means of scanning tunneling microscopy. Rather than using microwave pulses, we use a direct-current pump-probe scheme to...journal article 2021
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Pascual Laguna, A. (author), Karatsu, K. (author), Thoen, David (author), Murugesan, V. (author), Endo, A. (author), Baselmans, J.J.A. (author)A superconducting on-chip microstrip filter bank spectrometer prototype for Far-Infrared (FIR) Astronomy is presented. The measurements showcase its capabilities towards moderate spectral resolution (f/\Delta f\sim 500) broadband FIR spectroscopy. In this sub-mm-wave filter bank, each spectral channel consists of an 'I-shaped' microstrip THz...conference paper 2020
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Noordam, M.L. (author), Hernandez Rueda, F.J. (author), Talsma, L. Y. (author), Kuipers, L. (author)Nanostructured gratings in a metal surface can highly enhance nonlinear optical processes. The geometrical parameters that characterize a grating can be optimized to achieve intense near-fields, which in turn enhance the nonlinear optical signals. For a nonlinear process that involves multiple frequencies, like four-wave mixing (FWM), the...journal article 2020
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Parappurath, Nikhil (author), Alpeggiani, F. (author), Kuipers, L. (author), Verhagen, Ewold (author)Topological protection in photonics offers new prospects for guiding and manipulating classical and quantum information. The mechanism of spin-orbit coupling promises the emergence of edge states that are helical, exhibiting unidirectional propagation that is topologically protected against back scattering. We directly observe the topological...journal article 2020
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Gong, S. (author), Komen, I. (author), Alpeggiani, F. (author), Kuipers, L. (author)Valley pseudospin has emerged as a good quantum number to encode information, analogous to spin in spintronics. Two-dimensional transition metal dichalcogenides (2D TMDCs) recently attracted enormous attention for their easy access to the valley pseudospin through valley-dependent optical transitions. Different ways have been reported to read...journal article 2020
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Bolhuis, M. (author), Hernandez Rueda, F.J. (author), van Heijst, S.E. (author), Tinoco Rivas, M. (author), Kuipers, L. (author), Conesa Boj, S. (author)Transition metal dichalcogenides such as MoS2 represent promising candidates for building blocks of ultra-thin nanophotonic devices. For such applications, vertically-oriented MoS2 (v-MoS2) nanosheets could be advantageous as compared to conventional horizontal MoS2 (h-MoS2) given that their inherent broken symmetry would favor an enhanced...journal article 2020
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le Feber, B. (author), Sipe, J. E. (author), Wulf, M. (author), Kuipers, L. (author), Rotenberg, N. (author)Light is a union of electric and magnetic fields, and nowhere is the complex relationship between these fields more evident than in the near fields of nanophotonic structures. There, complicated electric and magnetic fields varying over subwavelength scales are generally present, which results in photonic phenomena such as extraordinary...journal article 2019