Probing low-energy hyperbolic polaritons in van der Waals crystals with an electron microscope
Probing low-energy hyperbolic polaritons in van der Waals crystals with an electron microscope
Abstract Van der Waals materials exhibit intriguing structural, electronic, and photonic properties. Electron energy loss spectroscopy within scanning transmission electron microscopy allows for nanoscale mapping of such properties. However, its detection is typically limited to energy losses in the eV rangeā€”too large for probing low-energy excitations such as phonons or ā€¦