Simulation of nodal-line semimetal in amplitude-shaken optical lattices

• URL: http://arxiv.org/abs/2003.03561v2
• Date: Thu, 27 Aug 2020 01:46:42 GMT
• Title: Simulation of nodal-line semimetal in amplitude-shaken optical lattices
• Abstract summary: We propose a method using ultracold atoms in two-dimensional amplitude-shaken bipartite hexagonal optical lattice to simulate nodal-line semimetal. By amplitude shaking, a time-reversal-symmetry-unstable mode is introduced into the bipartite optical lattice. The transformation from Dirac semimetal to nodal-line semimetal in pace with changing shaking parameters is observed.
• Score: 1.53744306569115
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: With topologcial semimetal developing, semimetal with nodal-line ring comes into people's vision as a powerful candidate for practical application of topological devices. We propose a method using ultracold atoms in two-dimensional amplitude-shaken bipartite hexagonal optical lattice to simulate nodal-line semimetal, which can be achieved in experiment by attaching one triangular optical lattice to a hexangonal optical lattice and periodically modulating the intensity and position of the triangular lattice. By amplitude shaking, a time-reversal-symmetry-unstable mode is introduced into the bipartite optical lattice, and then the nodal-line semimetal is gotten by adjusting the proportion of such mode and the trivial mode of hexagonal lattice. Through calculating the energy spectrum of effective Hamiltonian, the transformation from Dirac semimetal to nodal-line semimetal in pace with changing shaking parameters is observed. We also study the change of Berry curvature and Berry phase in the transformation, which provides guidance on measuring the transformation in experiment. By analyzing the symmetry of the system, the emergence of the time-reversal-symmetry-unstable mode is researched. This proposal provides a way to research the pure nodal-line semimetal without the influence of other bands, which may contribute to the study of those unique features of surface states and bulk states of nodal-line semimetal.

Related papers

• Spin-induced multipartite steady-state entanglement of motional modes in hexagonal boron nitride membranes [0.0]
  Three high-quality-factor mechanical modes of a hBN membrane monolayer are coupled to a common optically addressable spin defect.<n>We show that this coupling induces an effective phonon-phonon interaction in the dispersive regime.<n>We also investigate the effect of coupling strength on purity and entanglement.
  arXiv  Detail & Related papers  (2026-07-24T18:56:52Z)
• Topological control of third-harmonic generation in a mesoscopic quantum ring with spiral dislocation [0.0]
  We investigate the nonlinear optical response of a two-dimensional mesoscopic quantum ring subjected to a spiral dislocation.<n>The defect is modeled through a torsion-induced deformation of space, which modifies the effective metric without introducing curvature.
  arXiv  Detail & Related papers  (2026-06-29T12:54:30Z)
• Tailoring pure valley-Zeeman spin-orbit coupling in WSe$_2$-encapsulated monolayer graphene [42.39722022913058]
  Engineering proximity effects in twisted van der Waals heterostructures offers a powerful platform for designing electronic properties.<n>We report pure valley-Zeeman spin-orbit coupling in monolayer graphene, achieved by encapsulation between two parallel twisted WSe$$ monolayers.<n>We also demonstrate the ability to completely quench the proximity spin-orbit coupling by tuning the encapsulated geometry.
  arXiv  Detail & Related papers  (2026-06-02T07:43:48Z)
• Symmetry-Controlled Ultrastrong Phonon-Photon Coupling in a Terahertz Cavity [9.834840560116257]
  We use a symmetry-changing structural phase transition in lead halide perovskites to reversibly tune the phonon-photon coupling strength.<n> Terahertz time-domain spectroscopy of MAPbI3 embedded in nanoslot cavities reveals three polariton branches above the critical temperature Tc = 162.5 K.<n>Results demonstrate symmetry-controlled tuning of ultrastrong coupling via phonon engineering in optical cavities.
  arXiv  Detail & Related papers  (2025-11-20T12:06:33Z)
• Screw-dislocation-engineered quantum dot: geometry-tunable nonlinear optics, orbital qubit addressability, and torsion metrology [0.0]
  We study a single electron confined in a uniform-torsion medium, in a perpendicular magnetic field, and in the presence of an Aharonov--Bohm flux.<n>We find: (i) a torsion-controlled optical transition whose energy blue-shifts from $sim 6.8$ to $sim 15.5$meV and whose saturation intensity varies by an order of magnitude, enabling geometry-programmable optical switching.<n>We also show how torsion provides textitin situ control of emitter--cavity detuning and light-matter coupling in cavity QED, in
  arXiv  Detail & Related papers  (2025-11-17T21:16:35Z)
• Exponential enhancement of sensitivity in Ramsey interferometry with optically thick ensemble of atoms [0.0]
  We show that in optically thick samples with inhomogeneous broadening of resonant transition, the back-action can lead to the highly enhanced narrowing of Ramsey resonance.<n>Our findings open new opportunities for nonlinear high-resolution spectroscopy of resonant media and sensitivity enhancement in a new generation of solid state clocks.
  arXiv  Detail & Related papers  (2025-05-19T14:11:56Z)
• Engineering interaction potentials for stabilizing quantum quasicrystal phases [39.58317527488534]
  We show that two-dimensional octagonal, decagonal, and dodecagonal aperiodic phases require a distinct number of properly tuned characteristic length scales for their stabilization.<n>We also perform a structural characterization of the quasicrystal patterns obtained and show that these phases coexist with a finite superfluid fraction.
  arXiv  Detail & Related papers  (2025-03-19T15:59:11Z)
• Directionally Tunable Co- and Counter-Propagating Photon Pairs from a Nonlinear Metasurface [0.0]
  We show for the first time precise control of the emission angle of photon pairs generated from a nonlinear metasurface. Our measurements show angularly tunable pair-generation with high coincidence-to-accidental ratio. This work provides an important addition to the toolset of sub-wavelength thickness photon pair sources.
  arXiv  Detail & Related papers  (2024-03-12T13:35:57Z)
• Quench dynamics in higher-dimensional Holstein models: Insights from Truncated Wigner Approaches [41.94295877935867]
  We study the melting of charge-density waves in a Holstein model after a sudden switch-on of the electronic hopping. A comparison with exact data obtained for a Holstein chain shows that a semiclassical treatment of both the electrons and phonons is required in order to correctly describe the phononic dynamics.
  arXiv  Detail & Related papers  (2023-12-19T16:14:01Z)
• On the Su-Schrieffer-Heeger model of electron transport: low-temperature optical conductivity by the Mellin transform [62.997667081978825]
  We describe the low-temperature optical conductivity as a function of frequency for a quantum-mechanical system of electrons that hop along a polymer chain. Our goal is to show vias how the interband conductivity of this system behaves as the smallest energy bandgap tends to close.
  arXiv  Detail & Related papers  (2022-09-26T23:17:39Z)
• Searching for Ultra-Light Axions with Twisted Cavity Resonators of Anyon Rotational Symmetry with Bulk Modes of Non-Zero Helicity [0.0]
  M"obius-ring resonators stem from a well-studied and fascinating geometrical structure that features a one-sided topology. We present a new type of resonator through the formation of twisted hollow structures using equilateral triangular cross-sections.
  arXiv  Detail & Related papers  (2022-08-01T21:35:31Z)
• Localized vibrational modes in waveguide quantum optomechanics with spontaneously broken PT symmetry [117.44028458220427]
  We study theoretically two vibrating quantum emitters trapped near a one-dimensional waveguide and interacting with propagating photons. In the regime of strong optomechanical interaction the light-induced coupling of emitter vibrations can lead to formation of spatially localized vibration modes, exhibiting parity-time symmetry breaking.
  arXiv  Detail & Related papers  (2021-06-29T12:45:44Z)
• Floquet engineering of lattice structure and dimensionality in twisted moir\'e heterobilayers [0.0]
  We show that elliptically polarized light with sub-terahertz frequencies $hbaromegasim 1$ meV and moderate electric fields $Esim0.2$MV/cm allows tuning between the native triangular lattice and a square lattice. Without drive, these twisted TMDs simulate the single band Fermi-Hubbard model; we show that this approximation still holds in the presence of drive.
  arXiv  Detail & Related papers  (2021-03-17T19:24:09Z)
• Tuning the mode-splitting of a semiconductor microcavity with uniaxial stress [49.212762955720706]
  In this work we use an open microcavity composed of a "bottom" semiconductor distributed Bragg reflector (DBR) incorporating an n-i-p heterostructure. We demonstrate a reversible in-situ technique to tune the mode-splitting by applying uniaxial stress to the semiconductor DBR. A thorough study of the mode-splitting and its tuning across the stop-band leads to a quantitative understanding of the mechanism behind the results.
  arXiv  Detail & Related papers  (2021-02-18T13:38:32Z)
• Quantum anomalous Hall phase in synthetic bilayers via twistless twistronics [58.720142291102135]
  We propose quantum simulators of "twistronic-like" physics based on ultracold atoms and syntheticdimensions. We show that our system exhibits topologicalband structures under appropriate conditions.
  arXiv  Detail & Related papers  (2020-08-06T19:58:05Z)
• Hot-spots and gain enhancement in a doubly pumped parametric down-conversion process [62.997667081978825]
  We experimentally investigate the parametric down-conversion process in a nonlinear bulk crystal, driven by two non-collinear pump modes. The experiment shows the emergence of bright hot-spots in modes shared by the two pumps, in analogy with the phenomenology recently observed in 2D nonlinear photonic crystals.
  arXiv  Detail & Related papers  (2020-07-24T09:39:03Z)
• Engineering multipartite entangled states in doubly pumped parametric down-conversion processes [68.8204255655161]
  We investigate the quantum state generated by optical parametric down-conversion in a $chi(2) $ medium driven by two modes. The analysis shows the emergence of multipartite, namely 3- or 4-partite, entangled states in a subset of the modes generated by the process.
  arXiv  Detail & Related papers  (2020-07-23T13:53:12Z)
• Effective triangular ladders with staggered flux from spin-orbit coupling in 1D optical lattices [0.0]
  We show that spin-orbit coupled Bose gases in a one-dimensional optical lattice can be mapped into a two-leg triangular ladder with staggered flux. We identify a certain regime of parameters where a hard-core boson approximation holds and the system realizes a frustrated triangular spin ladder with tunable flux.
  arXiv  Detail & Related papers  (2020-03-09T13:54:20Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.