Quantum lifetime of two-dimensional electrons in a magnetic field

Abstract

The lifetime of two dimensional electrons in GaAs quantum wells, placed in weak quantizing magnetic fields, is measured using a simple transport method in broad range of temperatures from 0.3 K to 20 K. The temperature variations of the electron lifetime are found to be in good agreement with conventional theory of electron-electron scattering in 2D systems.

Quantum electron transport in magnetically entangled subbands

“…Shown in Fig.3(a) the curve at α c =88.6 degree will be labeled as R min and is related to classical contributions to the magnetoresistance. 27,29,30 The subtraction of the R min from the non-oscillating content of the magnetoresistance yields QPMR: R QP MR = R * QP MR − R min . A normalized QPMR, R QP MR /R D is presented in Fig.5(a), where R D is the resistance in zero magnetic field, Fig.5(a) shows that the decrease of the QPMR with the angle α is considerable and roughly uniform in the reciprocal magnetic field, 1/B ⊥ , indicating a consistent reduction of the cosine functions in Eq.…”

“…(6) reproduces QPMR in perpendicular magnetic fields. 14,25,27 The term σ MISO is related to magneto-intersubband resistance oscillations:…”

“…13,14,25 QPMR has been observed in electron systems with two populated subbands 26 and in narrow (13nm) quantum wells with a single subband populated. 27 The later is recently investigated in tilted magnetic fields. 28 These investigations have demonstrated that the QPMR magnitude decreases significantly with application of in-plane magnetic field.…”

Tunneling effects in tilted magnetic fields in n-InGaAs/GaAs structures with strongly coupled double quantum wells

“…The contribution of electron-electron scattering has been considered in many theoretical [9][10][11][12][13][14][15][16][17][18][19][20] and experimental [1][2][3][4][5][6][7][8] studies (see also references in the brief review [6]) during the last 20 years. For an ideal two dimensional system the theoretical temperature dependence of the inverse quantum lifetime (elec…”

“…A number of recent publications [1][2][3][4][5][6][7][8] were devoted to resonant tunneling in two layer electronic systems containing a two dimensional electron gas, for exam ple, in structures with two tunnel coupled double quantum wells (DQWs) with asymmetric scattering. Both transverse [4,5] and longitudinal [2,3,8] trans port with a change in the voltage across the gate have been studied.…”