Kinetics of indirect electron-hole recombination in a wide single quantum well in a strong electric field

Anisotropic superfluidity of two-dimensional excitons in a periodic potential

“…Fermionic (electron/hole) exchange effects in exciton-exciton interactions 21 which destroy "boseness" of excitons 22 and are disastrous [23][24][25] for the BEC are suppressed at low densities if the dipole-dipole interaction of excitons is sufficiently strong 26,27 . Excessive carriers 28 also suppressing BEC 29,30 can be compensated by injection of carriers with an opposite charge 10 . Finally, in the spatially separated 31,32 continuous wave pumping regime cooled (charge compensated 33 ) excitons flow to the studied area of the QW.…”

“…Their important virtue is the considerably long lifetime due to small overlap of electron and hole wavefunctions which suppresses recombination. In contemporary studies the most widespread are 2D dipolar excitons 6,8,9 in coupled quantum wells (QWs) 8 and wide single QWs 10,11 in a polarizing normal electric field. After a pump pulse creating 2D dipolar excitons in a QW they thermalize locally quite fast 12,13 .…”

“…After a pump pulse creating 2D dipolar excitons in a QW they thermalize locally quite fast 12,13 . The excitons can then cool down to low temperatures 14 due to the interaction with the semiconductor lattice 15 , as their lifetime is sufficiently long 10,16 . Disorder (due to impurities and interface roughness) 17,18 , inevitably present in semiconductors, is screened by the interexcitonic interactions 19 and is usually weak in wide single QWs 10,20 .…”

“…The excitons can then cool down to low temperatures 14 due to the interaction with the semiconductor lattice 15 , as their lifetime is sufficiently long 10,16 . Disorder (due to impurities and interface roughness) 17,18 , inevitably present in semiconductors, is screened by the interexcitonic interactions 19 and is usually weak in wide single QWs 10,20 . Fermionic (electron/hole) exchange effects in exciton-exciton interactions 21 which destroy "boseness" of excitons 22 and are disastrous [23][24][25] for the BEC are suppressed at low densities if the dipole-dipole interaction of excitons is sufficiently strong 26,27 .…”

Interband and intraband radiation from the n-InGaAs/GaAs heterostructures with quantum wells under the conditions of injection in high lateral electric fields

“…The similar strong increase of the lifetime was noted in a number of papers on investigations of the spatially indirect exitons in heterostructures with QWs (see, e.g. [15,16]). …”