English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Hot electron cooling rate P, due to acoustic phonons, is investigated inthree-dimensional Dirac fermion systems at low temperature taking account ofscreening of electron-acoustic phonon interaction. P is studied as a functionof electron temperature T_e and electron concentration n_e. Screening is foundto suppress P very significantly for about T_e < 0.5 K and its effect reducesconsiderably for about T_e > 1K in Cd_3As_2 . In Bloch-Gruniesen (BG) regime,for screened (unscreened) case T_e dependence is P ~ T_e^ 9 (T_e^ 5) and nedependence gives P ~ n_e ^-5/3(n_e^-1/3). The T_e dependence is characteristicsof 3D phonons and n_e dependence is characteristics of 3D Dirac fermions. In BGregime, screening effect is found to enhance for larger n_e. Screening is foundto reduce the range of validity of BG regime temperature. Plot of P / T_e^ 4 vsT_e shows a maximum at temperature T_e m which shifts to higher values forlarger n_e. Interesting observation is that maximum of P / T_e^4 is nearly samefor different n_e and T_em / n_e^ 1/3 appears to be nearly constant. Moreimportantly, we propose, the n_e dependent measurements of P would provide aclearer signature to identify 3D Dirac semimetal phase.

Hot electron cooling in three-dimensional Dirac fermion systems at low temperature: effect of screening