Resonant and anti‐resonant modes of the dilute, spin‐inbalanced, two‐dimensional electron liquid including correlations

Abstract

A spin‐sensitive linear response theory is presented that includes correlations beyond the well‐known random phase approximation. Especially for very dilute systems, such correlations play an important role. The response functions obtained give insight into both charge and longitudinal magnetic excitations. In addition to the spin‐plasmon, we propose a new regime where no magnetic excitation is possible, namely the magnetic anti‐resonance. Both effects lie in experimentally accessible ranges.

Dynamic response of partially spin- and valley-polarised two-dimensional electron liquids

“…Another crucial feature of partially polarised 2DELs are lines ω(q), where the system ignores external stimulation ("anti-resonances") [26,45]. Along ω mAR (q) it cannot be excited by a magnetic field; similarly, for ω vAR (q) external stress variations cause no response.…”

“…Plasmon pole approximation. In order to deepen the understanding of the physics behind these new modes and anti-resonances, the plasmon pole approximation (PPA) (also single-mode or Bijl-Feynman approximation) [1] suits best [26]. We briefly outline it for the spin-and valley-sensitive case.…”

“…Based on the random phase approximation (RPA) for the partially spin-polarised single-valley 2DEL, Agarwal et al [24] predicted a long-lived spin-plasmon. In a more advanced approach [25,26] it is substantially lowered in energy ω; further, a significant gap emerged in the particle-hole excitations of the majority spins, where magnetic perturbations cannot influence their behaviour.…”

Plasma diagnostic and microstructural study of WCN coatings growth by pulsed vacuum arc discharge

“…The obtained results are shown in Table 1. According to Tendero et al, [72] the plasma temperature varies from 0.67 eV (plasma envelop) to 1.36 eV (plasma core), which enables high-temperature applications (the use of the thermal effect of the plasma). [67] In addition, an increase in the excitation temperature with the increase in the number of pulses was observed.…”

“…Nemcova et al [70] and Run Liu et al [71] have suggested that a ceramic film can be formed due to increased heating from the larger discharges, leading to more extensive melting of the coating during the arc process. According to Tendero et al, [72] the plasma temperature varies from 0.67 eV (plasma envelop) to 1.36 eV (plasma core), which enables high-temperature applications (the use of the thermal effect of the plasma). The melting and boiling points of WC are 2942 and 6203 K, respectively.…”