Bound state
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Asymmetric Metasurfaces with High- Resonances Governed by Bound States in the Continuum Open
We reveal that metasurfaces created by seemingly different lattices of (dielectric or metallic) meta-atoms with broken in-plane symmetry can support sharp high-Q resonances arising from a distortion of symmetry-protected bound states in th…
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Majorana bound state in a coupled quantum-dot hybrid-nanowire system Open
Watching Majorana bound states form Majorana bound states (MBSs) are peculiar quasiparticles that may one day become the cornerstone of topological quantum computing. To engineer these states, physicists have used semiconductor nanowires i…
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Subwavelength dielectric resonators for nonlinear nanophotonics Open
Enhancing optical nonlinearity Intense pulses of light interacting with a dielectric material can induce optical nonlinear behavior, whereby the frequency of the output light can be doubled or tripled or excited to even higher harmonics of…
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Evidence for Majorana bound states in an iron-based superconductor Open
An iron home for Majoranas The surface of the iron-based superconductor FeTe 0.55 Se 0.45 has been identified as a potential topological superconductor and is expected to host exotic quasiparticles called the Majorana bound states (MBSs). …
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Observation of topological superconductivity on the surface of an iron-based superconductor Open
A topological superconductor A promising path toward topological quantum computing involves exotic quasiparticles called the Majorana bound states (MBSs). MBSs have been observed in heterostructures that require careful nanofabrication, bu…
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Nonlinear Metasurfaces Governed by Bound States in the Continuum Open
Nonlinear nanostructured surfaces provide a paradigm shift in nonlinear optics with new ways to control and manipulate frequency conversion processes at the nanoscale, also offering novel opportunities for applications in photonics, chemis…
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Metasurfaces with Maximum Chirality Empowered by Bound States in the Continuum Open
We demonstrate that rotationally symmetric chiral metasurfaces can support sharp resonances with the maximum optical chirality determined by precise shaping of bound states in the continuum (BICs). Being uncoupled from one circular polariz…
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Giant Nonlinear Response at the Nanoscale Driven by Bound States in the Continuum Open
Being motivated by the recent prediction of high-Q modes in subwavelength dielectric resonators inspired by bound states in the continuum (BIC), we study the second-harmonic generation from isolated subwavelength AlGaAs nanoantennas. We re…
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Andreev bound states versus Majorana bound states in quantum dot-nanowire-superconductor hybrid structures: Trivial versus topological zero-bias conductance peaks Open
Motivated by an important recent experiment [Deng et al., Science 354, 1557\n(2016)], we theoretically consider the interplay between Andreev bound\nstates(ABSs) and Majorana bound states(MBSs) in quantum dot-nanowire\nsemiconductor system…
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Formation of Bound States in the Continuum in Hybrid Plasmonic-Photonic Systems Open
A bound state in the continuum (BIC) is a localized state of an open structure with access to radiation channels, yet it remains highly confined with, in theory, an infinite lifetime and quality factor. There have been many realizations of…
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Ultralow-threshold laser using super-bound states in the continuum Open
Wavelength-scale lasers provide promising applications through low power consumption requiring for optical cavities with increased quality factors. Cavity radiative losses can be suppressed strongly in the regime of optical bound states in…
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Circularly Polarized States Spawning from Bound States in the Continuum Open
Bound states in the continuum in periodic photonic systems like photonic crystal slabs are proved to be accompanied by vortex polarization singularities on the photonic bands in the momentum space. The winding structures of polarization st…
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Bound states in the continuum and Fano resonances in the strong mode coupling regime Open
The study of resonant dielectric nanostructures with high refractive index is\na new research direction in nanoscale optics and metamaterial-inspired\nnanophotonics. Because of the unique optically-induced electric and magnetic\nMie resona…
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Chiral Quasi-Bound States in the Continuum Open
Quasi-bound states in the continuum (QBICs) are Fano resonant states with long optical lifetimes controlled by symmetry-breaking perturbations. While conventional Fano responses are limited to linear polarizations and do not support tailor…
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Toward tailoring Majorana bound states in artificially constructed magnetic atom chains on elemental superconductors Open
We demonstrate the artificial construction of magnetic atom chains on a conventional superconductor as a Majorana platform.
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Lieb-Robinson Bound and the Butterfly Effect in Quantum Field Theories Open
As experiments are increasingly able to probe the quantum dynamics of systems with many degrees of freedom, it is interesting to probe fundamental bounds on the dynamics of quantum information. We elaborate on the relationship between one …
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Multipolar origin of bound states in the continuum Open
Metasurfaces based on resonant subwavelength photonic structures enable novel methods of wavefront
\ncontrol and light focusing, underpinning a new generation of flat-optics devices. Recently emerged all-dielectric
\nmetasurfaces exhibit h…
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Toroidal dipole bound states in the continuum Open
Toroidal multipole moments are usually underestimated as they are quite weak in most cases of light-matter interaction. Herein, we reveal a strong link between the toroidal dipole resonance and the bound state in the continuum in the conte…
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Realization of a minimal Kitaev chain in coupled quantum dots Open
Majorana bound states constitute one of the simplest examples of emergent non-Abelian excitations in condensed matter physics. A toy model proposed by Kitaev shows that such states can arise at the ends of a spinless p-wave superconducting…
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Interference traps waves in an open system: bound states in the continuum Open
I review the four mechanisms of bound states in the continuum (BICs) in the application of microwave and acoustic cavities open to directional waveguides. The most simple are symmetry-protected BICs, which are localized inside the cavity b…
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Nearly quantized conductance plateau of vortex zero mode in an iron-based superconductor Open
Reaching a conductance plateau The surface of the iron-based superconductor FeTe 0.55 Se 0.45 satisfies the necessary conditions to support topological superconductivity. Under the application of a magnetic field, vortices with zero-bias p…
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Strong LHCb evidence supporting the existence of the hidden-charm molecular pentaquarks Open
On 26 March 2019, at the Rencontres de Moriond QCD conference, the LHCb Collaboration reported the observation of three new pentaquarks, namely Pc(4312), Pc(4440), and Pc(4457), which are consistent with the loosely bound molecular hidden-…
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Two-Dimensional Platform for Networks of Majorana Bound States Open
We model theoretically a two-dimensional electron gas (2DEG) covered by a superconductor and demonstrate that topological superconducting channels are formed when stripes of the superconducting layer are removed. As a consequence, Majorana…
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Lattice Prediction for Deeply Bound Doubly Heavy Tetraquarks Open
We investigate the possibility of qq^{'}b[over ¯]b[over ¯] tetraquark bound states using n_{f}=2+1 lattice QCD ensembles with pion masses ≃164, 299, and 415 MeV. Motivated by observations from heavy baryon phenomenology, we consider two la…
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Two-terminal charge tunneling: Disentangling Majorana zero modes from partially separated Andreev bound states in semiconductor-superconductor heterostructures Open
We demonstrate that partially overlapping Majorana bound states (MBSs) represent a generic low-energy feature that emerges in non-homogeneous semiconductor nanowires coupled to superconductors in the presence of a Zeeman field. The emergen…
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Photonic integrated circuits with bound states in the continuum Open
Waves that are perfectly confined in the continuous spectrum of radiating waves without interaction with them are known as bound states in the continuum (BICs). Despite recent discoveries of BICs in nanophotonics, full routing and control …
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Generation and Annihilation of Topologically Protected Bound States in the Continuum and Circularly Polarized States by Symmetry Breaking Open
We demonstrate by breaking the C_{6} symmetry for higher-order at-Γ bound states in the continuum (BICs) with topological charge -2 in photonic crystals (i) deterministic generation of off-Γ BICs from the at-Γ BIC and (ii) a variety of pai…
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Majorana Kramers Pairs in Higher-Order Topological Insulators Open
We propose a tune-free scheme to realize Kramers pairs of Majorana bound states in recently discovered higher-order topological insulators (HOTIs). We show that, by bringing two hinges of a HOTI into the proximity of an s-wave superconduct…
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Experimental phase diagram of zero-bias conductance peaks in superconductor/semiconductor nanowire devices Open
Map to Majorana fermions in nanowires is revealed.
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Quantized zero-bias conductance plateau in semiconductor-superconductor heterostructures without topological Majorana zero modes Open
We show that partially separated Andreev bound states (ps-ABSs), comprised of pairs of overlapping Majorana bound states (MBSs) emerging in quantum dot-semiconductor-superconductor heterostructures, produce robust zero bias conductance pla…