Spin relaxation in zinc blende and wurtzite CdSe quantum dots

Huxter, Vanessa M.; Kim, Jeongho; Lo, Samuel Chun‐Lap; Lee, Anna; Nair, P. Sreekumari; Scholes, Gregory D.

doi:10.1016/j.cplett.2010.03.081

Cited by 31 publications

(53 citation statements)

References 38 publications

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“…In our case, the nanocrystal with zinc blende lattice, the upper F¼ 7 1 states are optically active and have selection rules that allow for þ1 and À 1 levels by right-(s þ ) and left-(s À ) circularly polarized pulse, as shown in the inset of Fig. 1(b) [13]. As the photo-carrier lifetime exceeds the time window in which the spin dynamics is studied and the rapid holes spin dephasing occurs, consequently the electron-in-exciton transfers the spins to the long-lived electrons through exchange flip-flop scattering [20].…”

Section: Methodsmentioning

confidence: 98%

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Room-temperature spin coherence in zinc blende CdSe quantum dots studied by time-resolved Faraday ellipticity

Zhang

Jin

et al. 2014

Physica E: Low-dimensional Systems and Nanostructures

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Section: Methodsmentioning

confidence: 98%

“…Ideally, from the practical application point of view, the coherent spin dynamics is of great interest at room temperature. A faster exciton spin relaxation dynamics was observed in zinc blende CdSe QDs, compared with wurtzite CdSe QDs, using a cross-polarized heterodyned third-order transient grating technique [13].…”

Section: Introductionmentioning

confidence: 98%

Room-temperature spin coherence in zinc blende CdSe quantum dots studied by time-resolved Faraday ellipticity

Zhang

Jin

et al. 2014

Physica E: Low-dimensional Systems and Nanostructures

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“…Of course some spin randomization occurs in NP, owing to spin–orbit coupling; however, the rates of the electron-transfer processes compete well with the spin relaxation time, which is on the order of picoseconds. 44 …”

Section: Experimental Methodsmentioning

confidence: 99%

Role of the Electron Spin Polarization in Water Splitting

Mtangi

Kiran

Fontanesi

et al. 2015

J. Phys. Chem. Lett.

188

191

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We show that in an electrochemical cell, in which the photoanode is coated with chiral molecules, the overpotential required for hydrogen production drops remarkably, as compared with cells containing achiral molecules. The hydrogen evolution efficiency is studied comparing seven different organic molecules, three chiral and four achiral. We propose that the spin specificity of electrons transferred through chiral molecules is the origin of a more efficient oxidation process in which oxygen is formed in its triplet ground state. The new observations are consistent with recent theoretical works pointing to the importance of spin alignment in the water-splitting process.

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“…In this way, we are able to establish the regime of validity of previous studies which assumed a single dominating SOI mechanism. Furthermore, we explore spheroidal QDs beyond the usual quasi-2D limit, thus providing theoretical assessment for developing experimental research with spherical and prolate QDs [18,36].…”

Section: Introductionmentioning

confidence: 99%

Spin–orbit-induced hole spin relaxation in InAs and GaAs quantum dots

2013

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We study the effect of valence band spin-orbit interactions (SOI) on the acoustic phonon-assisted spin relaxation of holes confined in quantum dots (QDs). Heavy hole-light hole (hh-lh) mixing and all the spin-orbit terms arising from zinc-blende bulk inversion asymmetry (BIA) are considered on equal footing in a fully three-dimensional Hamiltonian. We show that hh-lh mixing and BIA have comparable contributions to the hole spin relaxation in self-assembled QDs, but BIA becomes dominant in gated QDs. Simultaneously accounting for both mechanisms is necessary for quantitatively correct results in quasi-two-dimensional QDs. The dependence of the hole spin relaxation on the QD geometry and spin splitting energy is drastically different from that of electrons, with a non-monotonic behavior which results from the interplay between SOI terms. Our results reconcile contradictory predictions of previous theoretical works and are consistent with experiments. For a qualitative understanding of the geometry dependence of 1/T h 1 , we rewrite the hole states, equation (14), as | h m = J z c m J z |φ m J z |3/2, J z , where |φ m J z = r c m J z ,r |r is the envelope function associated with the periodic Bloch function |3/2, J z . If we restrict to the diagonal components of H h-ph , the matrix element determining the relaxation rate becomes

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Spin relaxation in zinc blende and wurtzite CdSe quantum dots

Cited by 31 publications

References 38 publications

Room-temperature spin coherence in zinc blende CdSe quantum dots studied by time-resolved Faraday ellipticity

Room-temperature spin coherence in zinc blende CdSe quantum dots studied by time-resolved Faraday ellipticity

Role of the Electron Spin Polarization in Water Splitting

Spin–orbit-induced hole spin relaxation in InAs and GaAs quantum dots

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