2018/02/18 by Shrishail S. Kubakaddi, Shrishail S Kubakaddi, Tutul Biswas · 14 citations
Materials Science · Physics and Astronomy · #Advanced Thermoelectric Materials and Devices #Dirac (video compression format) #Electron #Hot electron #Phonon #Polar #Relaxation (psychology) #Semimetal #Thermal properties of materials #Topological Materials and Phenomena #cond-mat.mes-hall
paper · pdf · doi:10.1088/1361-648x/aac661
published in Journal of Physics Condensed Matter 30(26), 265303 (IOP Publishing) · 9 pages, 6 figures
arxiv created 2018/02/18 · openalex created_date 2018/03/06 · openalex publication_date 2018/05/21 · arxiv updated 2018/07/04 · openalex updated_date 2026/08/05
Abstract A theory of hot electron cooling power due to polar optical phonons P op is developed in 3D Dirac semimetal (3DDS) Cd 3 As 2 taking account of hot phonon effect. Hot phonon distribution N q and P op are investigated as a function of electron temperature T e , electron density n e , and phonon relaxation time . It is found that P op increases rapidly (slowly) with T e at lower (higher) temperature regime. Whereas, P op is weakly decreasing with increasing n e . The results are compared with those for three-dimensional electron gas (3DEG) in Cd 3 As 2 semiconductor. Hot phonon effect is found to reduce P op considerably and it is stronger in 3DDS Cd 3 As 2 than in Cd 3 As 2 semiconductor. P op is also compared with the hot electron cooling power due to acoustic phonons P ac . We find that a crossover takes place from P ac dominated cooling at low T e to P op dominated cooling at higher T e . The temperature at which this crossover occurs shifts towards higher values with the increase of n e . Also, hot electron energy relaxation time is discussed. It is suggested that can be tuned to achieve faster or slower energy loss for suitable applications of Cd 3 As 2 .