Plasmon modes in triple-point semimetal, its quadratic cousin, and Hopf semimetal
Ipsita Mandal
Abstract
We study collective charge excitations in pseudospin-1 triple-point semimetals within the random-phase approximation, considering both the linearised model with a flat-band and its quadratic-corrected counterpart. We analyse their density response, Drude weights, screening, plasmon dispersion and damping, particle-hole continua, and Friedel oscillations from the long-wavelength to the arbitrary-momentum regime. The quadratic correction renders the flat-band dispersive and endows it with a Fermi surface, thereby affecting the overall response. Comparisons with Weyl and Hopf semimetals reveal how bandstructure and quantum geometry jointly govern collective charge dynamics. While the Drude weights are determined by the Fermi surface and band-velocities, interband screening, plasmon dispersion, and Friedel oscillations reflect the quantum geometry of the eigenstates.
Create a lesson
Related papers
Single anyons and anyon binding in a quantum Hall dot
Marco Valentini, Will Wang, Amir Shapour Mohammadi et al.
Spin textures at the Fermi surface of ferromagnets and associated torque
T. Valet, J. Li, H. Jaffrès et al.
Dark state preparation in a zero-field-split molecular triplet
Maria Pfahler, Andrea Donarini
Role of dissipation dilution in achieving high mechanical quality factors in van der Waals resonators
Lukas Schleicher, Leonard Geilen, Alexander Musta et al.
Zeeman spin quantum geometry and intrinsic gyrotropic spin current
Srijan Chatterjee, Tarun Kanti Ghosh
WannierSTM: Efficient superconducting scanning-probe spectroscopy from maximally localized Wannier functions
Oscar Moreno Segura, Dorye L. Esteras, Andrei Shumilin et al.