Annalen der Physik最新文献

This paper proposes a novel approach to controlling the amplitude of the Aharonov–Bohm effect by utilizing a conformal mapping-based method. The core idea is to leverage the form-invariance of the Schrödinger equation under conformal transformations, which allows for the manipulation of the scattering amplitude through a carefully designed scalar potential. This approach extends the concept of transformation physics into charge-flux systems, providing a practical means to steer matter waves influenced by magnetic flux interactions. The paper comprehensively discusses how scalar potentials, determined by conformal mappings, can counterbalance the Aharonov–Bohm scattering, thus offering a new avenue for quantum control by local means rather than purely through non-local flux interactions.

The pursuit of room-temperature superconductivity has increasingly focused on hydrogen-rich compounds, where high-frequency hydrogen vibrations foster strong electron–phonon coupling, and dense crystalline phases under high pressure enable exceptional electronic properties. While binary hydrides such as H₃S and LaH₁₀ represent landmark successes, recent evidence suggests that ternary hydrides can achieve high-temperature superconductivity at substantially lower pressures, often with enhanced stability. Motivated by this potential, we perform a systematic computational screening of ternary hydrides. By integrating statistical insights from superconducting databases with empirical design principles based on hydrogen content, atomic mass ratio, and electronegativity, we efficiently navigate a vast chemical space. From an initial set of 261,532 A-B-H compositions, our algorithm identifies 3,453 candidates satisfying optimal descriptors criteria. This set includes 56 known superconductors, thereby validating the method, and 3,397 novel predictions. A subsequent refinement based on chemical feasibility narrows the list to 543 high-priority novel candidates with the greatest potential for high-T_c superconductivity. Notably, several compositions from our predicted set, including MgZrH₁₂, LuCaH₁₂, and BCaH₈, have been independently confirmed by recent first-principles calculations, underscoring the predictive power of our approach.

Systematic evaluation of spin orbit coupling on models for cubic LaH₁₀ (SG: $��F�m�\overline{3}�m�$) at pressure is based on ab initio density functional theory calculations with optimized experimental cell dimensions. Primitive lattice LaH₁₀ band structure details show asymmetric cosine-shaped bands that link key lattice nodes and cross the Fermi level. Crystal orbital overlap populations show that H─H bonds in the cubic unit cell contribute to bonding–antibonding transitions evident in cosine-shaped bands along the Γ–X reciprocal direction. Measures of energy asymmetry for these cosine-shaped bands reveal matches of calculated T_c with experimental T_c values for cubic LaH₁₀ at pressures between 135 and ∼220 GPa. Electron density distributions associated with asymmetry of the LaH₁₀ irregular chamfered cube are attributed to variations in hydrogen bonding with pressure. Changes to lattice vibrations between 135 and 220 GPa are co-incident with experimental and theoretical evidence for structural transformations at these pressures. Collective behaviour of hydrogen lattice vibrations and asymmetric changes to crystal structure are consistent with the dome-like format for experimental T_c values with pressure.

This work presents a novel traversable wormhole solution within the modified gravity framework of $��f�(�R�,�L�,�T�)�$ theory, where the gravitational action non-minimally couples geometry and matter fields. Employing the Van der Waals equation of state to model the exotic matter sustaining the wormhole throat, the field equations are analytically and numerically solved under a constant redshift function assumption. The shape function obtained satisfies all key wormhole conditions: throat regularity, flaring-out, and asymptotic flatness. Detailed energy condition analyses reveal global violation of the null energy condition by matter, though the modified gravity coupling permits shifting exotic behavior into the geometric sector. Stability is assessed via the volume integral quantifier, speed of sound, and adiabatic index, indicating a physically plausible, stable wormhole structure supported by anisotropic pressures. This study elucidates how tunable matter-geometry couplings in $��f�(�R�,�L�,�T�)�$ gravity can minimize exotic matter requirements and offers pathways for potential astrophysical signatures of such wormholes.

The quantum information properties of a monolayer of molybdenum disulfide exposed to a polarized monochromatic electromagnetic field are investigated. Using the density matrix at thermal equilibrium, total and correlated quantum coherence (quantified by the $�l_1$-norm) and thermal entanglement (using concurrence) are analyzed. Without external radiation, entanglement is favored at low temperatures and for small band gap, spin-orbit coupling, and wave vector, but rapidly disappears under thermal fluctuations, while coherence remains robust. Under a laser field, entanglement, although reduced, becomes more resistant to temperature rise, while coherence is strongly amplified. Photon-assisted transitions renormalize the band structure and introduce new couplings between electronic states, partially stabilizing non-local correlations and reinforcing quantum superpositions. Field strength, frequency, and polarization are key control parameters, with circular polarization providing the most favorable conditions for simultaneously enhancing coherence and entanglement. The results demonstrate the dual role of electromagnetic radiation as a stabilizer and amplifier of quantum correlations and highlight the potential of molybdenum disulfide for applications in quantum computing, secure communication, and high-precision detection.

Reversibility of quantum channels is a fundamental and key issue in quantum dynamics, with unitary evolutions as prototypical examples. However, there are reversible quantum channels going beyond unitary evolutions. In this work, we provide some characterizations of reversible quantum channels by relating recovery maps of reversible quantum channels with their dual maps. We analyze the structure of recovery maps of reversible quantum channels and provide a decomposition result for them. These structural results reveal some intrinsic aspects of reversible quantum channels and their recovery maps, and may be useful for the study of quantum dynamics and quantum error correction.