For each of the models we considered, we first study the no-flow limit Pe = 0 to use it as a baseline for quantifying the effect of advection on both the spatial patterns of population density and the long-term population size. We study this…
Category: 4. Physics
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A highly efficient triple band metasurface enabled absorber for 5G/6G millimeter wave applications
Khodadadi, B., Babaeinik, M., Ghods, V. & Rezaei, P. Triple-band metamaterial perfect absorber for refractive index sensing in THz frequency. Opt. Quant. Electron. 55, 431 (2023).
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Exact collective occupancies of the Moshinsky model in two-dimensional geometry
We consider a system of N bosons in a two-dimensional isotropic harmonic potential, interacting with a force proportional to the square of the distance between the particles. The Hamiltonian of this system has the form11
$$\begin{aligned} \mathscr…
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Quantum tomography of a third-order exceptional point in a dissipative trapped ion
Adiabatic elimination for the master equation
The dynamics of the full system described in Fig. 1b is governed by the Lindblad master equation (ℏ = 1)
$$\frac{d{\rho }_{f}}{dt}=-i[{H}_{f},{\rho }_{f}]+{\sum }_{\mu=1}^{6}({L}_{f,\mu }{\rho…
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Astrophysicist Proposes Interstellar Mission to Study Black Holes
In a new paper published in the journal iScience, an astrophysicist from Fudan University discusses the possibility of sending a nanocraft to a black hole at 20-25 light-years from Earth to test the nature of the compact object and fundamental…
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Unexpected Resonances Could Boost NMR’s Potency
• Physics 18, 145
A radio-frequency field can be resonant with nuclear spins in a sample…
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Scientists freeze quantum motion without cooling
What are the limits of quantum physics? This is a question that has been researched around the world for decades. If we want to make the properties of the quantum world technically usable, we need to understand whether objects that are…
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Optomechanical control of long-lived bulk acoustic phonons in the quantum regime
The cavity optomechanical system
In what follows, we build our cavity optomechanical system around the μHBAR seen in Fig. 1a. The μHBAR is an FP resonator for bulk acoustic phonons, supporting a series of high-Q-factor Gaussian modes. The μHBAR…
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All-electric control of skyrmion-bimeron transition in van der Waals heterostructures
Electrical control of magnetic anisotropy in multiferroic MoTeI/In2Se3
We started by considering a MoTeI monolayer, whose crystal structure is displayed in Fig. 1c, d with both top and side views, featuring a hexagonal…
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Strongly interacting Hofstadter states in magic-angle twisted bilayer graphene
Hofstadter, D. R. Energy levels and wave functions of Bloch electrons in rational and irrational magnetic fields. Phys. Rev. B 14, 2239–2249 (1976).
Wannier, G. H. A result not dependent on…
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