Interface effects in the Raman scattering of InN/AlN superlattices

Bezerra, E. F.; Barros, Eduardo B.; Gonçalves, J.R.; Freire, V. N.; Fílho, J. Mendes; Lemos, V.

doi:10.1103/physrevb.66.153314

Cited by 5 publications

(3 citation statements)

References 30 publications

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“…It holds true while the impedance is small. If this boundary condition is used for the Matsubara components (n ≥ 1) of the Green function, then the reflection coefficients can be written as follows [35,36]…”

Section: Anomalous Skin Effectmentioning

confidence: 99%

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Temperature correction to the Casimir force in cryogenic range and anomalous skin effect

Svetovoy¹,

Lokhanin²

2003

Phys. Rev. A

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The temperature correction to the Casimir force is considered for real metals at low temperatures. With the temperature decrease, the mean free path for electrons becomes larger than the field penetration depth. In this condition, description of metals with the impedance of anomalous skin effect is shown to be more appropriate than with the permittivity. The effect is crucial for the temperature correction. It is demonstrated that in the zero-frequency limit, the reflection coefficients should coincide with those of ideal metal if we demand the entropy to be zero at Tϭ0. All the other prescriptions discussed in the literature for the nϭ0 term in the Lifshitz formula give negative entropy. It is shown that the temperature correction in the region of anomalous skin effect is not suppressed as it happens in the plasma model. This correction will be important in the future cryogenic measurements of the Casimir force.

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Section: Anomalous Skin Effectmentioning

confidence: 99%

“…In this sense one can say that in the range of anomalous skin effect the temperature correction becomes large. The relative correction G(a, T ) in (36) is maximal (≈ 0.53) at the temperature…”

Section: B Temperature Correction To the Casimir Forcementioning

confidence: 99%

Temperature correction to the Casimir force in cryogenic range and anomalous skin effect

Svetovoy¹,

Lokhanin²

2003

Phys. Rev. A

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“…They may also carry enormous currents [7] and may provide a sensible justification for many astrophysical phenomena, such as the origin of primordial magnetic fields [8], charged vacuum condensates [9] and sources of ultra-high energy cosmic rays [10,11,12,13], among others. They could also enforce the possible origin for the seed fluctuation density perturbations that imprint in the cosmic microwave background radiation (CMBR), which became the large-scale structure of the Universe as observed today [14,15,16,17]. In view of the possibility that supersymmetry was realized in the early Universe and was broken before or at the same time as cosmic string were formed, many recent works investigate cosmic string in connection with a supersymmetric framework in inequivalent form [18,19,20].…”

Section: Introductionmentioning

confidence: 99%

A discussion on supersymmetric cosmic strings with gauge-field mixing

2004

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In this paper, following a stream of investigation on supersymmetric gauge theories with cosmic string solutions, we contemplate the possibility of building up a D-and-F term cosmic string by means of a gauge-field mixing in connection with a U (1) × U (1) ′ -symmetry. The spontaneous break of both gauge symmetry and supersymmetry are thoroughly analysed and the fermion zero-modes are worked out. The role of the gauge-field mixing parameter is elucidated in connection with the string configuration that comes out. As an application of the model presented here, we propose the possibility that the supersimetric cosmic string yield production of fermionic charge carriers that may eject, at their late stages, particles that subsequently decay to produce cosmic rays of ultra-high energy. In our work, it turns out that massive supersymmetric fermionic partners may be produced for a susy breaking scale in the range 10 11 to 10 13 GeV, which is compatible with the phenomenology of a gravitino mass at the TeV scale. We also determine the range of the gauge-field mixing parameter, α, in connection with the mass scales of the present model. PACS numbers:

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Engineering the Coherent Phonon Transport in Polar Ferromagnetic Oxide Superlattices

Choi,

Jeong,

Jeong

et al. 2024

Advanced Science

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Artificial superlattices composed of perovskite oxides serves as an essential platform for engineering coherent phonon transport by redefining the lattice periodicity, which strongly influences the lattice‐coupled phase transitions in charge and spin degrees of freedom. However, previous methods of manipulating phonons have been limited to controlling the periodicity of superlattice, rather than utilizing complex mutual interactions that are prominent in transition metal oxides. In this study on oxide superlattices composed of ferromagnetic metallic SrRuO3 and quantum paraelectric SrTiO3, phonon modulation by controlling the geometry of superlattice in atomic‐scale precision is realized, demonstrating the coherent phonon engineering using structural and magnetic phase transitions. By modulating the interface density, coherent‐incoherent crossover of the phonon transport at room temperature is observed, which is coupled with a change in interfacial structural continuity. Upon cooling, the close relation between phonon transport and multiple phase transitions is identified. In particular, the enhancement of the polar state in SrTiO3 layer at ≈200 K leads to the weakening of phonon coherence and a further reduction of thermal conductivity in superlattices compared to the bulk limit. These findings provide a guide to developing future thermoelectric nanodevices by engineering the coherence of phonons via the design of complex oxide heterostructures.

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Interface effects in the Raman scattering of InN/AlN superlattices

Cited by 5 publications

References 30 publications

Temperature correction to the Casimir force in cryogenic range and anomalous skin effect

Temperature correction to the Casimir force in cryogenic range and anomalous skin effect

A discussion on supersymmetric cosmic strings with gauge-field mixing

Engineering the Coherent Phonon Transport in Polar Ferromagnetic Oxide Superlattices

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