Exchange enhancement of quasiparticle and ESR spin-gap in symmetric and asymmetric narrow-gap quantum wells

15th Russian Youth Conference on Physics and Astronomy

物理学;天文学

Krishtopenko, S.S.^1,2 ; Kalinin, K.P.^1 ; Malyzhenkov, A.V.^1 ; Maremyanin, K.V.^1 ; Gavrilenko, V.I.^1 ; Goiran, M.^2 ; Sadofyev, Yu.G.^3

Institute for Physics of Microstructures, Russian Academy of Sciences, GSP-105, 603950, Nizhny Novgorod, Russia^1

Laboratoire National des Champs Magnétiques Intenses (LNCMI-T), CNRS UPR 3228 Université de Toulouse, 143 Avenue de Rangueil, F-31400 Toulouse, France^2

P.N. Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia^3

关键词: 2-D electron gas (2DEG);    Exchange enhancement;    Interaction effect;    Many-body corrections;    Quantum Hall regime;    Quasi particles;    Single-mode approximation;    Spin orbit interactions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/461/1/012037/pdf
DOI  :  10.1088/1742-6596/461/1/012037

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

We report a study of electron-electron (e-e) interaction effect on spin-gap in n-type narrow-gap quantum well (QW) heterostructures. By using the Hartree-Fock approximation (HFA) and generalized single-mode approximation (GSMA) based on the 8-band k·p Hamiltonian we demonstrate that spin-orbit interaction and the mixing between |S>- and |P>-states in the conduction and valence bands affect significantly many-body corrections to the spin-gap in symmetric and asymmetric QWs in the integer and fractional Quantum Hall regime. The spin-gap values estimated for 2D electron gas (2DEG) in InAs/AlSb QWs are compared with the experimental results obtained by magnetotransport and by electrically detected electron spin resonance (ESR).