Comment on “Uncertainty Relation for Photons”

Wang, Zhiyong; Xiong, Cai-Dong; Qiu, Qi

doi:10.1103/physrevlett.109.188901

Cited by 7 publications

(17 citation statements)

References 1 publication

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“…gives the equations which are in some sense on an equal footing with the Dirac equation [2,3]. Likewise, one can apply the (1, 0) (0,1) ⊕ description to reformulating Maxwell equations as the so-called Dirac-like equation [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

The effect of gravitational spin–orbit coupling on the circular photon orbit in the Schwarzschild geometry

Wang¹,

Qiu²,

Wang³

et al. 2016

Class. Quantum Grav.

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The (1, 0) (0,1) ⊕ representation of the group SL(2, C) provides a six-component spinor equivalent to the electromagnetic field tensor. By means of the (1, 0) (0,1) ⊕ description, one can treat the photon field in curved spacetime via spin connection and the tetrad formalism, which is of great advantage to study the gravitational spin-orbit coupling of photons. Once the gravitational spin-orbit coupling is taken into account, the traditional radius of the circular photon orbit in the Schwarzschild geometry should be replaced with two different radiuses corresponding to the photons with the helicities of 1 ± , respectively.Owing to the splitting of energy levels induced by the spin-orbit coupling, photons (from Hawking radiations, say) escaping from a Schwarzschild black hole are partially polarized, provided that their initial velocities possess nonzero tangential components.

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Section: Introductionmentioning

confidence: 99%

The effect of gravitational spin–orbit coupling on the circular photon orbit in the Schwarzschild geometry

Wang¹,

Qiu²,

Wang³

et al. 2016

Class. Quantum Grav.

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“…It predicts that, in the presence of an external magnetic field, the DW subjects to a rigid-body translational motion which is valid when the magnetic field is in a proper regime. Despite its attractive simplicity and elegance, and the fact that this Walker solution has played a pivotal role in our current understanding of both current-driven and field-driven DW propagation in magnetic nanowires [9][10][11][12][13], whether or not this solution is genuine, i.e., describing a realistic physical system, is still an open ques-tion. As one necessary touchstone, genuine solution of a physical system must be stable against small perturbations.…”

Section: Introductionmentioning

confidence: 99%

Instability of Walker Propagating Domain Wall in Magnetic Nanowires

Wang

2013

Phys. Rev. Lett.

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Stability of the well-known Walker propagating domain wall (DW) solution of the Landau-Lifshitz-Gilbert equation is analytically investigated. Surprisingly, the Walker's rigid body propagating DW mode is not stable against the spin wave/wavepacket emission. In the low field region only stern spin waves are emitted while both stern and bow waves are generated under high fields. In a high enough field, but below the Walker breakdown field, the Walker solution could be convective/absolute unstable if the transverse magnetic anisotropy is larger than a critical value, corresponding to a significant modification of the DW profile and DW propagating speed.Comment: 4 page

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“…1 b) [15][16][17]. The first spin wave excitation peak at 7 cm −1 has not been assigned because it can either be attributed to the Φ + 0 mode or can result from small domains in the sample with weak magnetization [18].…”

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confidence: 99%

Driving Spin Excitations by Hydrostatic Pressure inBiFeO3

et al. 2015

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Optical spectroscopy has been combined with computational and theoretical techniques to show how the spin dynamics in the model multiferroic BiFeO3 responds to the application of hydrostatic pressure and its corresponding series of structural phase transitions from R3c to the Pnma phases. As pressure increases, multiple spin excitations associated with non-collinear cycloidal magnetism collapse into two excitations, which show jump discontinuities at some of the ensuing crystal phase transitions. Effective Hamiltonian approach provides information on the electrical polarization and structural changes of the oxygen octahedra through the successive structural phases. The extracted parameters are then used in a Ginzburg-Landau model to reproduce the evolution with pressure of the spin waves excitations observed at low energy and we demonstrate that the structural phases and the magnetic anisotropy drive and control the spin excitations.

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Comment on “Uncertainty Relation for Photons”

Abstract: In a recent interesting Letter [Phys. Rev. Lett. 108, 140401 (2012)] I. Bialynicki-Birula and his coauthor have derived the uncertainty relation for the photons in three dimensions.However, some of their arguments are problematical, and this impacts their conclusion.

Cited by 7 publications

References 1 publication

The effect of gravitational spin–orbit coupling on the circular photon orbit in the Schwarzschild geometry

The effect of gravitational spin–orbit coupling on the circular photon orbit in the Schwarzschild geometry

Instability of Walker Propagating Domain Wall in Magnetic Nanowires

Driving Spin Excitations by Hydrostatic Pressure inBiFeO3

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