Spin affects the properties of the electron gas in a subtle way. The quantitative and, in fact, even the qualitative determination of spin dependent properties in this system requires calculations of extreme accuracy. Here, we review predictions of fixed-node diffusion Monte Carlo simulations with Slater-Jastrow as well as backflow nodes for the 2D electron gas at zero temperature, focusing on the spin-polarization dependence of the ground state energy and on the occurrence of spontaneous spin-polarization. We also analyze the enhancement of the spin susceptibility (with respect to the Pauli value), over a wide range of densities. Finally we discuss the form of effective electron-electron interactions that may be used to estimate the possibility of spontaneous superconductivity in the 2D electron gas. (C) 2001 Elsevier Science Ltd. All rights reserved.
Spin effects in the 2D electron gas / G., Senatore; S., Moroni; Varsano, Daniele. - In: SOLID STATE COMMUNICATIONS. - ISSN 0038-1098. - STAMPA. - 119:4-5(2001), pp. 333-340. (Intervento presentato al convegno Euroconference on Spin Effects in Mesoscopic Systems tenutosi a CORTONA, ITALY nel JUN 28-JUL 02, 2000) [10.1016/s0038-1098(01)00173-9].
Spin effects in the 2D electron gas
VARSANO, DANIELE
2001
Abstract
Spin affects the properties of the electron gas in a subtle way. The quantitative and, in fact, even the qualitative determination of spin dependent properties in this system requires calculations of extreme accuracy. Here, we review predictions of fixed-node diffusion Monte Carlo simulations with Slater-Jastrow as well as backflow nodes for the 2D electron gas at zero temperature, focusing on the spin-polarization dependence of the ground state energy and on the occurrence of spontaneous spin-polarization. We also analyze the enhancement of the spin susceptibility (with respect to the Pauli value), over a wide range of densities. Finally we discuss the form of effective electron-electron interactions that may be used to estimate the possibility of spontaneous superconductivity in the 2D electron gas. (C) 2001 Elsevier Science Ltd. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
