Positronium (Ps), governed by Quantum Electrodynamics (QED), provides a rich domain for exploring fundamental physics. Monte Carlo simulations of its decay provide insights into various aspects of particle physics. Th...
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We study a cluster of quantum dots defined within silicene that hosts confined electron states with spin and valley degrees of freedom. Atomistic tight-binding and continuum Dirac approximations are applied for a few-...
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We study a cluster of quantum dots defined within silicene that hosts confined electron states with spin and valley degrees of freedom. Atomistic tight-binding and continuum Dirac approximations are applied for a few-electron system in the quest for spontaneous valley polarization driven by interdot tunneling and an electron-electron interaction, i.e., a valley counterpart of itinerant Nagaoka ferromagnetic ordering recently identified in a GaAs square cluster of quantum dots with three excess electrons [J. P. Dehollain et al., Nature (London) 579, 528 (2020)]. We find that for a Hamiltonian without intrinsic spin-orbit coupling the valley polarization in the ground state can be observed in a range of interdot spacings provided that the spin of the system is frozen by an external magnetic field. The intervalley scattering effects are negligible for a cluster geometry that supports the valley-polarized ground state. In the presence of a strong intrinsic spin-orbit coupling that is characteristic to silicene, no external magnetic field is necessary for the observation of a ground state that is polarized in both the spin and valley. The effective magnetic field due to the spin-orbit interaction produces a perfect anticorrelation of the spin and valley isospin components in the low-energy spectrum. Experimental detection of spin-valley ground-state polarization by a charge response to a potential variation is discussed.
Using the small-x Improved Transverse Momentum Dependent factorization (ITMD), which, for a general two-to-two massless scattering can be proved within the Color Glass Condensate (CGC) theory for transverse momenta of...
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The positronium system, a bound state of an electron and a positron, is suitable for testing the predictions of quantum electrodynamics (QED) as well as symmetry invariance. The Ps triple state, the ortho-Positronium ...
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We discuss the annular electron confinement on the liquid helium surface induced by a submerged tubular electrode. For a shallow liquid layer the resulting potential has a minimum off the symmetry axis of the electrod...
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We discuss the annular electron confinement on the liquid helium surface induced by a submerged tubular electrode. For a shallow liquid layer the resulting potential has a minimum off the symmetry axis of the electrode. The ground-state angular momentum transitions that are driven by the external magnetic field can be resolved when the confinement radii in the first and second Rydberg subbands of the vertical quantization are different, e.g., for submersion depth of the tube comparable to its radius. Then, discontinuities in the main microwave absorption line appear with the period that corresponds to the subsequent magnetic flux quanta passing across the area within the ground-state confinement radius.
In a recent work [R. Shojaei et al., Phys. Rev. E 100, 022303 (2019)] the authors calculate numerically the critical temperature Tc of the balanced-imbalanced phase transition in a fully connected graph. According to ...
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In a recent work [R. Shojaei et al., Phys. Rev. E 100, 022303 (2019)] the authors calculate numerically the critical temperature Tc of the balanced-imbalanced phase transition in a fully connected graph. According to their findings, Tc decreases with the number of nodes N. Here we calculate the same critical temperature using the heat-bath algorithm. We show that Tc increases with N as Nγ, with γ close to 0.5 or 1.0. This value depends on the initial fraction of positive bonds.
We theoretically study scanning gate microscopy (SGM) of electron and hole trajectories in a quantum point contact (QPC) embedded in a normal-superconductor (NS) junction. At zero voltage bias, the electrons and holes...
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Θ+ is a putative light pentaquark state of positive parity with minimal quark content (uudds¯). It naturally emerges in chiral models for baryons, but experimental evidence is uncertain. We review the theoretica...
We review recent results for forward jests at the LHC and EIC as obtained within small-x Improved Transverse Momentum Dependent factorization (ITMD). In addition to elementary overview of various approaches to perturb...
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We study a simple deterministic map that leads a fully connected network to the Heider balance. The map is realized by an algorithm that updates all links synchronously in a way depending on the state of the entire ne...
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We study a simple deterministic map that leads a fully connected network to the Heider balance. The map is realized by an algorithm that updates all links synchronously in a way depending on the state of the entire network. We observe that the probability of reaching a balanced state increases with the system size N. Jammed states become less frequent for larger N. The algorithm generates also limit cycles, mostly of length 2, but also of length 3, 4, 6, 12, or 14. We give a simple argument to estimate the mean size of basins of attraction of balanced states, and we discuss the symmetries of the system including the automorphism group as well as gauge invariance of triad configurations. We argue that both symmetries play an essential role in the occurrence of cycles observed in the synchronous dynamics realized by the algorithm.
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