Magnetic semiconductor quantum wells in high fields to 60 Tesla: Photoluminescence linewidth annealing at magnetization steps

Crooker, S. A.; Rickel, D.G.; Lyo, S. K.; Samarth, N.; Awschalom, D. D.

doi:10.1103/physrevb.60.r2173

Cited by 40 publications

(41 citation statements)

References 16 publications

(2 reference statements)

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“…Estimation for the barrier materials in our structures gives us g e =+1. 32 Zn 0.89 Mg 0.11 S 0.18 Se 0.82 barriers and ∆E g ≈200 meV) has been investigated in Ref. 37.…”

Section: E Zeeman Splitting Of Excitons and Free Carriersmentioning

confidence: 99%

Binding energy of charged excitons in ZnSe-based quantum wells

et al. 2002

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Excitons and charged excitons (trions) are investigated in ZnSe-based quantum well structures with (Zn,Be,Mg)Se and (Zn,Mg)(S,Se) barriers by means of magneto-optical spectroscopy. Binding energies of negatively-(X − ) and positively (X + ) charged excitons are measured as functions of quantum well width, free carrier density and in external magnetic fields up to 47 T. The binding energy of X − shows a strong increase from 1.4 to 8.9 meV with decreasing quantum well width from 190 to 29Å. The binding energies of X + are about 25% smaller than the X − binding energy in the same structures. The magnetic field behavior of X − and X + binding energies differ qualitatively. With growing magnetic field strength, X − increases its binding energy by 35-150%, while for X + it decreases by 25%. Zeeman spin splittings and oscillator strengths of excitons and trions are measured and discussed.

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“…Estimation for the barrier materials in our structures gives us g e =+1. 32 Zn 0.89 Mg 0.11 S 0.18 Se 0.82 barriers and ∆E g ≈200 meV) has been investigated in Ref. 37.…”

Section: E Zeeman Splitting Of Excitons and Free Carriersmentioning

confidence: 99%

Binding energy of charged excitons in ZnSe-based quantum wells

et al. 2002

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“…Experiments in magnetic fields up to 8 T were performed in Würzburg in a split-coil superconducting solenoid and for temperatures from 1.6 to 70 K. A mid-pulse magnet (∼ 400-ms decay) at the National High Magnetic Field Laboratory (Los Alamos, USA) was used for experiments up to 48 T performed at a temperature T = 1.6 K. Details of the pulsed magnet setup are given in Ref. 38. Photoluminescence was excited by UV lines of an Ar-ion laser (Würzburg) or by a He-Cd laser with a photon energy of 3.8 eV (Los Alamos).…”

Section: Methodsmentioning

confidence: 99%

Magneto-optics of two-dimensional electron gases modified by strong Coulomb interactions in ZnSe quantum wells

et al. 2005

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The optical properties of two-dimensional electron gases in ZnSe/(Zn,Be)Se and ZnSe/(Zn,Be,Mg)Se modulation-doped quantum wells with electron densities up to 1.4 × 10 12 cm −2were studied by photoluminescence, photoluminescence excitation and reflectivity in a temperature range between 1.6 and 70 K and in external magnetic fields up to 48 T. In these structures, the Fermi energy of the two-dimensional electron gas falls in the range between the trion binding energy and the exciton binding energy. Optical spectra in this regime are shown to be strongly influenced by the Coulomb interaction between electrons and photoexcited holes. In high magnetic fields, when the filling factor of the two-dimensional electron gas becomes smaller than two, a change from Landau-level-like spectra to exciton-like spectra occurs. We attempt to provide a phenomenological description of the evolution of optical spectra for quantum wells with strong Coulomb interactions.

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“…In this case, a fiber-coupled probe of the type described above typically suffices to obtain high quality spectra that are largely free from mechanical vibrations and subsequent misalignment during the magnet pulse. Similar fiber-coupled probe designs have been successfully used in conjunction with pulsed magnets to study mm-squared samples of magnetic semiconductors [32,33], quantum wells [34,35], colloidal quantum dots [36,37], carbon nanotubes [38,39], and polymers [40].…”

Section: Methodsmentioning

confidence: 99%

Magnetoreflection spectroscopy of monolayer transition-metal dichalcogenide semiconductors in pulsed magnetic fields

Stier

McCreary

Jonker

et al. 2016

Journal of Vacuum Science &Amp; Technology B, Nanotechnology and Microelectronics: Materials, Processing, Measurement, and Phen

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We describe recent experimental efforts to perform polarization-resolved optical spectroscopy of monolayer transition-metal dichalcogenide semiconductors in very large pulsed magnetic fields to 65 tesla. The experimental setup and technical challenges are discussed in detail, and temperaturedependent magneto-reflection spectra from atomically thin tungsten disulphide (WS2) are presented. The data clearly reveal not only the valley Zeeman effect in these 2D semiconductors, but also the small quadratic exciton diamagnetic shift from which the very small exciton size can be directly inferred. Finally, we present model calculations that demonstrate how the measured diamagnetic shifts can be used to constrain estimates of the exciton binding energy in this new family of monolayer semiconductors.

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Magnetic semiconductor quantum wells in high fields to 60 Tesla: Photoluminescence linewidth annealing at magnetization steps

Abstract: Magnetic semiconductors offer a unique possibility for strongly tuning the intrinsic alloy disorder potential with applied magnetic field. We report the direct observation of a series of step-like reductions in the magnetic alloy disorder potential in single

Cited by 40 publications

References 16 publications

Binding energy of charged excitons in ZnSe-based quantum wells

Binding energy of charged excitons in ZnSe-based quantum wells

Magneto-optics of two-dimensional electron gases modified by strong Coulomb interactions in ZnSe quantum wells

Magnetoreflection spectroscopy of monolayer transition-metal dichalcogenide semiconductors in pulsed magnetic fields

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