document

Impact of Transforming Interface Geometry on Edge States in Valley Photonic Crystals

Yu, D. (author), Arora, S. (author), Kuipers, L. (author)

We investigate how altering the interface geometry from a zigzag to a glide plane interface between two topologically distinct valley Hall emulating photonic crystals (VPC), profoundly affects edge states. We experimentally observe a transition from gapless to gapped edge states, accompanied by the occurrence of slow light within the...

journal article 2024

document

Superconducting single-photon detectors get hot

Chang, J. (author), Esmaeil Zadeh, I.Z. (author)

journal article 2023

document

Ultrafast Time Dynamics of Plasmonic Fractional Orbital Angular Momentum

Bauer, T.A. (author), Davis, Timothy J. (author), Frank, Bettina (author), Dreher, Pascal (author), Janoschka, David (author), Meiler, Tim C. (author), Meyer zu Heringdorf, Frank J. (author), Kuipers, L. (author), Giessen, Harald (author)

The creation and manipulation of optical vortices, both in free space and in two-dimensional systems such as surface plasmon polaritons (SPPs), has attracted widespread attention in nano-optics due to their robust topological structure. Coupled with strong spatial confinement in the case of SPPs, these plasmonic vortices and their underlying...

journal article 2023

document

Single-electron charge transfer into putative Majorana and trivial modes in individual vortices

Ge, Jian Feng (author), Bastiaans, K.M. (author), Chatzopoulos, Damianos (author), Cho, Doohee (author), Tromp, Willem O. (author), Benschop, Tjerk (author), Niu, Jiasen (author), Gu, Genda (author), Allan, Milan P. (author)

Majorana bound states are putative collective excitations in solids that exhibit the self-conjugate property of Majorana fermions—they are their own antiparticles. In iron-based superconductors, zero-energy states in vortices have been reported as potential Majorana bound states, but the evidence remains controversial. Here, we use scanning...

journal article 2023

document

Normalization procedure for obtaining the local density of states from high-bias scanning tunneling spectroscopy

Rejali, R. (author), Farinacci, L.S.M. (author), Otte, A. F. (author)

Differential conductance spectroscopy performed in the high bias regime - in which the applied voltage exceeds the sample work function - is a suboptimal measure of the local density of states due to the effects of the changing tunnel barrier. Additionally, the large applied voltage oftentimes makes constant-height measurement experimentally...

journal article 2023

document

Full Temporal Characterization of Ultrabroadband Few-Cycle Laser Pulses Using Atomically Thin WS₂

Hernandez-Rueda, Javier (author), Pérez-Benito, Óscar (author), Martínez Maestro, Laura (author), Noordam, M.L. (author), Kuipers, L. (author), Weigand, Rosa (author)

Nowadays, the accurate and full temporal characterization of ultrabroadband few-cycle laser pulses with pulse durations below 7 fs is of great importance in fields of science that investigate ultrafast dynamic processes. There are several indirect methods that use nonlinear optical signals to retrieve the complex electric field of femtosecond...

journal article 2023

document

Silicon anisotropy in a bi-dimensional optomechanical cavity

Kersul, Cauê M. (author), Benevides, Rodrigo (author), Moraes, Flávio (author), de Aguiar, Gabriel H.M. (author), Wallucks, A. (author), Groeblacher, S. (author), Wiederhecker, Gustavo S. (author), Mayer Alegre, Thiago P. (author)

In this work, we study the effects of mechanical anisotropy in a 2D optomechanical crystal geometry. We fabricate and measure devices with different orientations, showing the dependence of the mechanical spectrum and the optomechanical coupling on the relative angle of the device to the crystallography directions of silicon. Our results show...

journal article 2023

document

Advances in Magnetics Roadmap on Spin-Wave Computing

Blanter, Y.M. (author), Carmiggelt, J.J. (author), Cotofana, S.D. (author), Hamdioui, S. (author), Nikitin, A. A. (author), Reimann, T. (author), Sharma, S. (author), van der Sar, T. (author), Zhang, X. (author)

Magnonics addresses the physical properties of spin waves and utilizes them for data processing. Scalability down to atomic dimensions, operation in the GHz-to-THz frequency range, utilization of nonlinear and nonreciprocal phenomena, and compatibility with CMOS are just a few of many advantages offered by magnons. Although magnonics is still...

journal article 2022

document

Ultrafast scanning electron microscopy with sub-micrometer optical pump resolution

Garming, M.W.H. (author), Weppelman, I.G.C. (author), Lee, M. (author), Stavenga, T. (author), Hoogenboom, J.P. (author)

Ultrafast scanning electron microscopy images carrier dynamics and carrier induced surface voltages using a laser pump electron probe scheme, potentially surpassing all-optical techniques in probe resolution and surface sensitivity. Current implementations have left a four order of magnitude gap between optical pump and electron probe...

journal article 2022

document

Confined Vacuum Resonances as Artificial Atoms with Tunable Lifetime

Rejali, R. (author), Farinacci, L.S.M. (author), Coffey Blanco, D. (author), Broekhoven, R. (author), Gobeil, J. (author), Blanter, Y.M. (author), Otte, A. F. (author)

Atomically engineered artificial lattices are a useful tool for simulating complex quantum phenomena, but have so far been limited to the study of Hamiltonians where electron-electron interactions do not play a role. However, it is precisely the regime in which these interactions do matter where computational times lend simulations a critical...

journal article 2022

document

Breakdown of Spin-to-Helicity Locking at the Nanoscale in Topological Photonic Crystal Edge States

Arora, S. (author), Bauer, T.A. (author), Parappurath, N. (author), Barczyk, R.T. (author), Verhagen, E. (author), Kuipers, L. (author)

We measure the local near-field spin in topological edge state waveguides that emulate the quantum spin Hall effect. We reveal a highly structured spin density distribution that is not linked to a unique pseudospin value. From experimental near-field real-space maps and numerical calculations, we confirm that this local structure is essential...

journal article 2022

document

Filtering and Imaging of Frequency-Degenerate Spin Waves Using Nanopositioning of a Single-Spin Sensor

Simon, B.G. (author), Kurdi, S. (author), Carmiggelt, J.J. (author), Borst, M. (author), Katan, A.J. (author), van der Sar, T. (author)

Nitrogen-vacancy (NV) magnetometry is a new technique for imaging spin waves in magnetic materials. It detects spin waves by their microwave magnetic stray fields, which decay evanescently on the scale of the spin-wavelength. Here, we use nanoscale control of a single-NV sensor as a wavelength filter to characterize frequency-degenerate spin...

journal article 2022

document

Revealing the nanogeometry of WS2 nanoflowersby polarization-resolved Raman spectroscopy

Komen, I. (author), van Heijst, S.E. (author), Caldarola, M. (author), Conesa Boj, S. (author), Kuipers, L. (author)

Recent studies of transition metal dichalcogenides (TMDs) have revealed exciting optical properties, such as stable excitons and chiral light–matter interactions. Chemical vapor deposition techniques provide a platform for the fabrication of nanostructures with diverse geometries, ranging from horizontal flakes to flower-like structures. Raman...

journal article 2022

document

Simultaneous Characterization of Two Ultrashort Optical Pulses at Different Frequencies Using a WS₂Monolayer

Noordam, Marcus L. (author), Hernandez Rueda, F.J. (author), Kuipers, L. (author)

The precise characterization of ultrashort laser pulses has been of interest to the scientific community for many years. Frequency-resolved optical gating (FROG) has been extensively used to retrieve the temporal and spectral field distributions of ultrashort laser pulses. In this work, we exploit the high, broad-band nonlinear optical...

journal article 2022

document

Non-classical mechanical states guided in a phononic waveguide

Zivari, A. (author), Stockill, R.H.J. (author), Fiaschi, N. (author), Groeblacher, S. (author)

The ability to create, manipulate and detect non-classical states of light has been key for many recent achievements in quantum physics and for developing quantum technologies. Achieving the same level of control over phonons, the quanta of vibrations, could have a similar impact, in particular on the fields of quantum sensing and quantum...

journal article 2022

document

On-chip distribution of quantum information using traveling phonons

Zivari, A. (author), Fiaschi, N. (author), Burgwal, Roel (author), Verhagen, Ewold (author), Stockill, Robert (author), Groeblacher, S. (author)

Distributing quantum entanglement on a chip is a crucial step toward realizing scalable quantum processors. Using traveling phonons-quantized guided mechanical wave packets-as a medium to transmit quantum states is now gaining substantial attention due to their small size and low propagation speed compared to other carriers, such as electrons...

journal article 2022

document

Cloaked near-field probe for non-invasive near-field optical microscopy

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

document

Electronic Properties and Phase Transition in the Kagome Metal Yb_0.5Co₃Ge₃

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

document

Imaging Spin-Wave Damping Underneath Metals Using Electron Spins in Diamond

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

document

Einstein-Podolsky-Rosen entanglement and asymmetric steering between distant macroscopic mechanical and magnonic systems

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