Long-lived, room-temperature electron spin coherence in colloidal CdS quantum dots

D. H. Feng; X. Li; T. Q. Jia; X. Q. Pan; Z. R. Sun; Z. Z. Xu

doi:10.1063/1.3696069

Long-lived, room-temperature electron spin coherence in colloidal CdS quantum dots

D. H. Feng^*
, X. Li
, T. Q. Jia
, X. Q. Pan
, Z. R. Sun
, Z. Z. Xu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

Time-resolved Faraday rotation spectroscopy is used to study the electron spin coherence in colloidal CdS quantum dots. Long-lived spin coherence with dephasing time T ₂ ^* > 3 ns has been found at room temperature. Spin dynamics unaffected by the faster carrier recombination suggests the spin signal coming from the residual electrons in the dots. A small external transverse magnetic field of 50 mT can extend T ₂ ^* ∼ 2 times longer compared with that in zero magnetic field. Hyperfine interaction between electron and nuclear spins limits the dephasing time in zero or low magnetic field, while for higher magnetic fields, inhomogeneous dephasing becomes to dominate the spin dynamics.

Original language	English
Article number	122406
Journal	Applied Physics Letters
Volume	100
Issue number	12
DOIs	https://doi.org/10.1063/1.3696069
State	Published - 19 Mar 2012
Externally published	Yes

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title = "Long-lived, room-temperature electron spin coherence in colloidal CdS quantum dots",

abstract = "Time-resolved Faraday rotation spectroscopy is used to study the electron spin coherence in colloidal CdS quantum dots. Long-lived spin coherence with dephasing time T 2 * > 3 ns has been found at room temperature. Spin dynamics unaffected by the faster carrier recombination suggests the spin signal coming from the residual electrons in the dots. A small external transverse magnetic field of 50 mT can extend T 2 * ∼ 2 times longer compared with that in zero magnetic field. Hyperfine interaction between electron and nuclear spins limits the dephasing time in zero or low magnetic field, while for higher magnetic fields, inhomogeneous dephasing becomes to dominate the spin dynamics.",

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AU - Feng, D. H.

AU - Li, X.

AU - Jia, T. Q.

AU - Pan, X. Q.

AU - Sun, Z. R.

AU - Xu, Z. Z.

PY - 2012/3/19

Y1 - 2012/3/19

N2 - Time-resolved Faraday rotation spectroscopy is used to study the electron spin coherence in colloidal CdS quantum dots. Long-lived spin coherence with dephasing time T 2 * > 3 ns has been found at room temperature. Spin dynamics unaffected by the faster carrier recombination suggests the spin signal coming from the residual electrons in the dots. A small external transverse magnetic field of 50 mT can extend T 2 * ∼ 2 times longer compared with that in zero magnetic field. Hyperfine interaction between electron and nuclear spins limits the dephasing time in zero or low magnetic field, while for higher magnetic fields, inhomogeneous dephasing becomes to dominate the spin dynamics.

AB - Time-resolved Faraday rotation spectroscopy is used to study the electron spin coherence in colloidal CdS quantum dots. Long-lived spin coherence with dephasing time T 2 * > 3 ns has been found at room temperature. Spin dynamics unaffected by the faster carrier recombination suggests the spin signal coming from the residual electrons in the dots. A small external transverse magnetic field of 50 mT can extend T 2 * ∼ 2 times longer compared with that in zero magnetic field. Hyperfine interaction between electron and nuclear spins limits the dephasing time in zero or low magnetic field, while for higher magnetic fields, inhomogeneous dephasing becomes to dominate the spin dynamics.

UR - https://www.scopus.com/pages/publications/84859530448

U2 - 10.1063/1.3696069

DO - 10.1063/1.3696069

M3 - 文章

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SN - 0003-6951

VL - 100

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 12

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ER -

Long-lived, room-temperature electron spin coherence in colloidal CdS quantum dots

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