Theory of Casimir-Polder forces

Skagerstam, Bo-Sture; Rekdal, Per Kristian; Vaskinn, Asle Heide

doi:10.1103/physreva.80.022902

Cited by 17 publications

(13 citation statements)

References 63 publications

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“…We find that, for θm f > 0, the CP potential retains its usual attractive form, while for θm f < 0 it acquires a positive maximum V CPmax located at a distance B max , thus implying the CP potential turns out to be repulsive for distances b > b max . This is consistent with previous calculations which show that Casimir forces can be repulsive if they involve magnetic moments couplings [56,57]. In a similar fashion, it was recently shown that the dynamical properties of the atomic electron can be tuned with the TMEP θ [58].…”

Section: Discussionsupporting

confidence: 92%

Interaction of a hydrogenlike ion with a planar topological insulator

Martín-Ruiz

Urrutia

2018

Phys. Rev. A

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An electric charge near the surface of a topological insulator (TI) induces an image magnetic monopole. Here we study the spectra of hydrogenlike ions near the surface of a planar TI, taking into account the modifications which arise due to the presence of the image monopole magnetic fields. In fact, the atom-TI interaction provides additional contributions to the Casimir-Polder potential while the ion-TI interaction modifies the energy shifts in the spectrum, which now became distance dependent. We show that the hyperfine structure is sensitive to the image magnetic monopole fields in states with nonzero angular momentum, and that circular Rydberg ions can enhance the maximal energy shifts. We discuss in detail the energy splitting of the nP 1/2 and nP 3/2 states in hydrogen. We also analyze the Casimir-Polder potential and find that this magnetic interaction produces a large distance repulsive tail for some particular atomic states. A sizable value of the maximum of the potential requires TIs with very low values of the permittivity together with high values of the topological magnetoelectric polarization.

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Section: Discussionsupporting

confidence: 92%

Interaction of a hydrogenlike ion with a planar topological insulator

Martín-Ruiz

Urrutia

2018

Phys. Rev. A

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“…This is a surprising claim, since over its close to sixty year history there has been a host of applications to which the PZW Hamiltonian has been applied, which have agreed with, or led to predictions borne out by experiment. There are many hundreds of papers in the established literature citing the original work, bearing testimony to its efficacy and success; numerous significant applications and advances have built upon it, even over the last decade [12], [13], [14], [15], [16], [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29], [30], [31], [32], [33], [34], [35], [36], [37]. Indeed we know of no cases where the theory has been faulted by experimental studywhich would usually be the condition to invite reappraisal of a previously successful theory.…”

Section: Introductionmentioning

confidence: 99%

Perspective: Quantum Hamiltonians for optical interactions

Andrews

Jones

Salam

et al. 2018

The Journal of Chemical Physics

116

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The multipolar Hamiltonian of quantum electrodynamics is extensively employed in chemical and optical physics to treat rigorously the interaction of electromagnetic fields with matter. It is also widely used to evaluate intermolecular interactions. The multipolar version of the Hamiltonian is commonly obtained by carrying out a unitary transformation of the Coulomb gauge Hamiltonian that goes by the name of Power-Zienau-Woolley (PZW). Not only does the formulation provide excellent agreement with experiment, and versatility in its predictive ability, but also superior physical insight. Recently, the foundations and validity of the PZW Hamiltonian have been questioned, raising a concern over issues of gauge transformation and invariance, and whether observable quantities obtained from unitarily equivalent Hamiltonians are identical. Here, an in-depth analysis of theoretical foundations clarifies the issues and enables misconceptions to be identified. Claims of non-physicality are refuted: the PZW transformation and ensuing Hamiltonian are shown to rest on solid physical principles and secure theoretical ground.

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“…In this case, moreover, the force cannot be significantly increased via conventional optical pumping. The spin wave-induced forces are mostly repulsive at room temperature, a well-known feature of fluctuational forces on magnetic dipole transitions [88,89], and attractive at cryogenic temperatures. A detailed analysis and characterization of all these forces, including their dependence with the applied field H 0 , is given in Appendix E. The possibility of pumping the paramagnetic spin paves the way toward the detection of the spin waveinduced force at room temperature.…”

Section: Back-action-based Spin Wave Sensingmentioning

confidence: 99%

Towards a quantum interface between spin waves and paramagnetic spin baths

Gonzalez-Ballestero,

van der Sar,

Romero-Isart

2020

Preprint

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Spin waves have risen as promising candidate information carriers for the next generation of information technologies. Recent experimental demonstrations of their detection using electron spins in diamond pave the way towards studying the back-action of a controllable paramagnetic spin bath on the spin waves. Here, we present a quantum theory describing the interaction between spin waves and paramagnetic spins. As a case study we consider an ensemble of nitrogen-vacancy spins in diamond in the vicinity of an Yttrium-Iron-Garnet thin film. We show how the backaction of the ensemble results in strong and tuneable modifications of the spin-wave spectrum and propagation properties. These modifications include the full suppression of spin-wave propagation and, in a different parameter regime, the enhancement of their propagation length by ∼ 50%. Furthermore, we show how the spin wave thermal fluctuations induce a measurable frequency shift of the paramagnetic spins in the bath. This shift results in a thermal dispersion force that can be measured optically and/or mechanically with a diamond mechanical resonator. In addition, we use our theory to compute the spin wave-mediated interaction between the spins in the bath. We show that all the above effects are measurable by state-of-the-art experiments. Our results provide the theoretical foundation for describing hybrid quantum systems of spin waves and spin baths, and establish the potential of quantum spins as active control, sensing, and interfacing tools for spintronics.

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Theory of Casimir-Polder forces

Cited by 17 publications

References 63 publications

Interaction of a hydrogenlike ion with a planar topological insulator

Interaction of a hydrogenlike ion with a planar topological insulator

Perspective: Quantum Hamiltonians for optical interactions

Towards a quantum interface between spin waves and paramagnetic spin baths

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