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Nanomaterials
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Advances in Spin Physics in Semiconductor Nanostructures
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Advances in Spin Physics in Semiconductor Nanostructures

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanophotonics Materials and Devices".

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 5963

Special Issue Editor

Dr. Kirill Kavokin

E-Mail Website
Guest Editor
Spin Optics Laboratory, Saint Petersburg State University, St. Petersburg 198504, Russia
Interests: spin dynamics in solids; spintronics; solid-state optics; magnetic semiconductors; quantum dots; biophysics: magnetoreception, animal navigation and physics of vision

Special Issue Information

Dear Colleagues, 

Spin physics in semiconductors has a 50-year history marked with bright discoveries and, mostly failed, hopes for large-scale applications in spintronics. It was vastly enriched when quantum wells and quantum dots came into play, becoming a playground for testing fundamental concepts of quantum mechanics and many-body physics. Now, the field continues to flourish on old as well as new types of structures and materials, including 2D crystals, microcavities, and perovskite-based nanostructures.

This Special Issue aims to publish recent advances in the spin physics of charge carriers, excitons, nuclei, and magnetic impurities in all types of semiconductor structures. Original research papers as well as review articles are welcomed.  

Dr. Kirill Kavokin
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2900 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • spin
  • semiconductor
  • quantum dot
  • quantum well
  • quantum wire
  • spin temperature
  • exciton
  • nuclear spin system
  • microcavity
  • semiconductor nanostructure

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Published Papers (4 papers)

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Research

16 pages, 828 KiB  
Article
Coherent Spin Dynamics of Electrons in CdSe Colloidal Nanoplatelets
by Sergey R. Meliakov, Vasilii V. Belykh, Ina V. Kalitukha, Aleksandr A. Golovatenko, Alessio Di Giacomo, Iwan Moreels, Anna V. Rodina and Dmitri R. Yakovlev
Nanomaterials 2023, 13(23), 3077; https://doi.org/10.3390/nano13233077 - 4 Dec 2023
Cited by 1 | Viewed by 1614
Abstract
Coherent spin dynamics of electrons in CdSe colloidal nanoplatelets are investigated by time-resolved pump–probe Faraday rotation at room and cryogenic temperatures. We measure electron spin precession in a magnetic field and determine g-factors of 1.83 and 1.72 at low temperatures for nanoplatelets [...] Read more.
Coherent spin dynamics of electrons in CdSe colloidal nanoplatelets are investigated by time-resolved pump–probe Faraday rotation at room and cryogenic temperatures. We measure electron spin precession in a magnetic field and determine g-factors of 1.83 and 1.72 at low temperatures for nanoplatelets with a thickness of 3 and 4 monolayers, respectively. The dephasing time of spin precession T2* amounts to a few nanoseconds and has a weak dependence on temperature, while the longitudinal spin relaxation time T1 exceeds 10 ns even at room temperature. Observations of single and double electron spin–flips confirm that the nanoplatelets are negatively charged. The spin–flip Raman scattering technique reveals g-factor anisotropy by up to 10% in nanoplatelets with thicknesses of 3, 4, and 5 monolayers. In the ensemble with a random orientation of nanoplatelets, our theoretical analysis shows that the measured Larmor precession frequency corresponds to the in-plane electron g-factor. We conclude that the experimentally observed electron spin dephasing and its acceleration in the magnetic field are not provided by the electron g-factor anisotropy and can be related to the localization of the resident electrons and fluctuations of the localization potential. Full article
(This article belongs to the Special Issue Advances in Spin Physics in Semiconductor Nanostructures)
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22 pages, 941 KiB  
Article
Optical Alignment and Optical Orientation of Excitons in CdSe/CdS Colloidal Nanoplatelets
by Olga O. Smirnova, Ina V. Kalitukha, Anna V. Rodina, Grigorii S. Dimitriev, Victor F. Sapega, Olga S. Ken, Vladimir L. Korenev, Nikolai V. Kozyrev, Sergey V. Nekrasov, Yuri G. Kusrayev, Dmitri R. Yakovlev, Benoit Dubertret and Manfred Bayer
Nanomaterials 2023, 13(17), 2402; https://doi.org/10.3390/nano13172402 - 24 Aug 2023
Cited by 2 | Viewed by 1325
Abstract
Optical alignment and optical orientation of excitons are studied experimentally on an ensemble of core/shell CdSe/CdS colloidal nanoplatelets. Linear and circular polarization of photoluminescence during resonant excitation of excitons is measured at cryogenic temperatures and with magnetic fields applied in the Faraday geometry. [...] Read more.
Optical alignment and optical orientation of excitons are studied experimentally on an ensemble of core/shell CdSe/CdS colloidal nanoplatelets. Linear and circular polarization of photoluminescence during resonant excitation of excitons is measured at cryogenic temperatures and with magnetic fields applied in the Faraday geometry. The developed theory addresses the optical alignment and optical orientation of excitons in colloidal nanocrystals, taking into account both bright and dark exciton states in the presence of strong electron–hole exchange interaction and the random in-plane orientation of nanoplatelets within the ensemble. Our theoretical analysis of the obtained experimental data allows us to evaluate the exciton fine structure parameters, the g-factors, and the spin lifetimes of the bright and dark excitons. The optical alignment effect enables the identification of the exciton and trion contributions to the emission spectrum, even in the absence of their clear separation in the spectra. Full article
(This article belongs to the Special Issue Advances in Spin Physics in Semiconductor Nanostructures)
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11 pages, 1622 KiB  
Article
Cooling of the Nuclear Spin System of a Nanostructure by Oscillating Magnetic Fields
by Kirill V. Kavokin
Nanomaterials 2023, 13(14), 2120; https://doi.org/10.3390/nano13142120 - 20 Jul 2023
Viewed by 931
Abstract
We propose a method of cooling nuclear spin systems of solid-state nanostructures by applying a time-dependent magnetic field synchronized with spin fluctuations. Optical spin noise spectroscopy is considered a method of fluctuation control. Depending on the mutual orientation of the oscillating magnetic field [...] Read more.
We propose a method of cooling nuclear spin systems of solid-state nanostructures by applying a time-dependent magnetic field synchronized with spin fluctuations. Optical spin noise spectroscopy is considered a method of fluctuation control. Depending on the mutual orientation of the oscillating magnetic field and the probe light beam, cooling might be either provided by dynamic spin polarization in an external static field or result from population transfer between spin levels without build-up of a net magnetic moment (“true cooling”). Full article
(This article belongs to the Special Issue Advances in Spin Physics in Semiconductor Nanostructures)
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18 pages, 868 KiB  
Article
Optical Orientation of Excitons in a Longitudinal Magnetic Field in Indirect-Band-Gap (In,Al)As/AlAs Quantum Dots with Type-I Band Alignment
by T. S. Shamirzaev, A. V. Shumilin, D. S. Smirnov, D. Kudlacik, S. V. Nekrasov, Yu G. Kusrayev, D. R. Yakovlev and M. Bayer
Nanomaterials 2023, 13(4), 729; https://doi.org/10.3390/nano13040729 - 14 Feb 2023
Cited by 5 | Viewed by 1614
Abstract
Exciton recombination and spin dynamics in (In,Al)As/AlAs quantum dots (QDs) with indirect band gap and type-I band alignment were studied. The negligible (less than 0.2 μeV) value of the anisotropic exchange interaction in these QDs prevents the mixing of the excitonic basis states [...] Read more.
Exciton recombination and spin dynamics in (In,Al)As/AlAs quantum dots (QDs) with indirect band gap and type-I band alignment were studied. The negligible (less than 0.2 μeV) value of the anisotropic exchange interaction in these QDs prevents the mixing of the excitonic basis states and makes the formation of spin-polarized bright excitons possible under quasi-resonant, circularly polarized excitation. The recombination and spin dynamics of excitons are controlled by the hyperfine interaction between the electron and nuclear spins. A QD blockade by dark excitons was observed in the magnetic field, that eliminates the impact of nuclear spin fluctuations. A kinetic model which accounts for the population dynamics of the bright and dark exciton states as well as for the spin dynamics was developed to quantitatively describe the experimental data. Full article
(This article belongs to the Special Issue Advances in Spin Physics in Semiconductor Nanostructures)
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