Optical chiral phonons can light up the intravalley dark exciton via absorpting circularly polarized photons. Furthermore, acoustic chiral phonons induced by the nonlocal geometric force can transport angular momentum and contribute to a non-dissipative phonon Hall viscosity.
https://arxiv.org/abs/2506.03748
phonon magnetic moment [1–4]. The reason
of phonon splitting is that the application of magnetic field
destroys the time reversal T symmetry of the system. How-
ever, beyond external fields, the intrinsic magnetic properties
of materials can also break T symmetry.
phonon chirality phenomena in magnetic materials.
For the frequency associated with Fig. 3(a), right circu-
larly polarized photons are preferentially absorbed, resulting
in predominantly left polarized transmitted light. Conversely,
for the frequency corresponding to Fig. 3(b), left circularly po-
larized photons are preferentially absorbed, and the transmit-
ted light exhibits right polarization. Thus, the distinct absorp-
tion behaviors of linearly polarized light at different frequen-
cies provide a means to selectively probe transitions involving
either the right-handed or the left-handed phonon. This can
manifest as optical circular dichroism, which can be exper-
imentally detected.
non-
local geometric force fundamentally alters acoustic phonon
dynamics and induces finite phonon Berry curvature and an-
gular momentum. This gives rise to an angular momentum
Hall effect, where the Hall response is markedly enhanced due
to the nearly degenerate longitudinal and transverse acoustic
branches. Moreover, this nonlocal geometric force also gener-
ates a finite Hall viscosity, primarily arising from the coupling
between acoustic branches.Since phonon angular momentum can
drive magnetization, the transport of angular momentum can
further induce magnetization changes at remote locations, of-
fering promising applications in spintronics and magnetism
research
https://advanced.onlinelibrary.wiley.com/doi/full/10.1002/adma.202311350
Li et al.[30] experimentally realized Weyl points in a chiral phonon crystal system and showed that the surface states associated with Weyl points are topological in nature. Tuo et al.[31] propose a two-dimensional acoustic topological insulator, which verifies that topological phase transitions occur around a double Dirac cone, providing a strategy for exploring topological states. With reference to previous experience and inspired by the enhanced coupling design of each metasurface cell,[32-35] we propose a nonlocal moiré hyperbolic metasurface with nonlocal meta-cells, which enables strong coupling and energy tunneling between adjacent cells. This approach opens up the possibility of creating acoustically extremely anisotropic metasurfaces and brings classical acoustics into acoustic twistronics.
ASymmetric Modes as entanglement secret of superdense teleportation
The protocol uses pairs of photons that are “hyperentangled” — simultaneously entangled in more than one state variable, in this case in polarization and in orbital angular momentum — with a restricted number of possible states in each variable. In this way, each photon can carry more information than in earlier quantum teleportation experiments.
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