Entropy Wave Instability in Dirac and Weyl Semimetals
Hydrodynamic instabilities driven by a direct current are analyzed in 2D and 3D relativisticlike systems with the Dyakonov-Shur boundary conditions supplemented by a boundary condition for temperature. Besides the conventional Dyakonov-Shur instability for plasmons, we find an entropy wave instabili...
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| Veröffentlicht in: | Physical review letters 2021-10, Vol.127 (17), p.1-176602, Article 176602 |
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| creator | Sukhachov, P. O. Gorbar, E. V. Shovkovy, I. A. |
| description | Hydrodynamic instabilities driven by a direct current are analyzed in 2D and 3D relativisticlike systems with the Dyakonov-Shur boundary conditions supplemented by a boundary condition for temperature. Besides the conventional Dyakonov-Shur instability for plasmons, we find an entropy wave instability in both 2D and 3D systems. The entropy wave instability is a manifestation of the relativisticlike nature of electron quasiparticles and a nontrivial role of the energy current in such systems. These two instabilities occur for the opposite directions of fluid flow. While the Dyakonov-Shur instability is characterized by the plasma frequency in 3D and the system size in 2D, the frequency of the entropy wave instability is tunable by the system size and the flow velocity. |
| doi_str_mv | 10.1103/PhysRevLett.127.176602 |
| format | Article |
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| source | American Physical Society Journals; EZB-FREE-00999 freely available EZB journals |
| subjects | Boundary conditions Direct current Elementary excitations Entropy Flow stability Flow velocity Fluid dynamics Fluid flow Metalloids Plasma frequencies Plasmons Two dimensional analysis |
| title | Entropy Wave Instability in Dirac and Weyl Semimetals |
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