Electrically induced shifts of the GaAs nuclear spin levels

Dumas, K. A.; Soest, J. F.; Sher, A.; Swiggard, E.M.

doi:10.1103/physrevb.20.4406

Cited by 24 publications

(26 citation statements)

References 10 publications

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“…However, its unrestricted orientation during NMR evolution enables study of the angular dependence of nuclear spin interactions. Electric-field-induced 8,[29][30][31][32][33] or strain-induced 6,34,35 quadrupole interactions have distinct dependence on magnetic-field orientation and are particularly relevant in our studies. 6,8,9 These arise, to first order, from the distortion of noncentrosymmetric crystals.…”

Section: Reorientation Of the Magnetic Fieldmentioning

confidence: 99%

An optical NMR spectrometer for Larmor-beat detection and high-resolution POWER NMR

Kempf

Marohn

Carson

et al. 2008

Review of Scientific Instruments

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Optical nuclear magnetic resonance ͑ONMR͒ is a powerful probe of electronic properties in III-V semiconductors. Larmor-beat detection ͑LBD͒ is a sensitivity optimized, time-domain NMR version of optical detection based on the Hanle effect. Combining LBD ONMR with the line-narrowing method of POWER ͑perturbations observed with enhanced resolution͒ NMR further enables atomically detailed views of local electronic features in III-Vs. POWER NMR spectra display the distribution of resonance shifts or line splittings introduced by a perturbation, such as optical excitation or application of an electric field, that is synchronized with a NMR multiple-pulse time-suspension sequence. Meanwhile, ONMR provides the requisite sensitivity and spatial selectivity to isolate local signals within macroscopic samples. Optical NMR, LBD, and the POWER method each introduce unique demands on instrumentation. Here, we detail the design and implementation of our system, including cryogenic, optical, and radio-frequency components. The result is a flexible, low-cost system with important applications in semiconductor electronics and spin physics. We also demonstrate the performance of our systems with high-resolution ONMR spectra of an epitaxial AlGaAs/ GaAs heterojunction. NMR linewidths down to 4.1 Hz full width at half maximum were obtained, a 10 3 -fold resolution enhancement relative any previous optically detected NMR experiment.

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Section: Reorientation Of the Magnetic Fieldmentioning

confidence: 99%

An optical NMR spectrometer for Larmor-beat detection and high-resolution POWER NMR

Kempf

Marohn

Carson

et al. 2008

Review of Scientific Instruments

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show abstract

“…Since the nuclei in GaAs are located at positions that lack inversion symmetry, an electric field applied to the sample causes a distortion of the orbitals and nuclear structure in such a way that it induces quadrupole coupling. 10,11,20 This indirect coupling makes quadrupolar spins located at sites without inversion symmetry sensitive probes of electric fields. We use this fact to probe the electric field variation in a multiple quantum well sample.…”

Section: Depth Profilementioning

confidence: 99%

“…For 75 As, this coupling constant is approximately C 14 ϭ3 ϫ10 12 m Ϫ1 , with the indices given in Voigt notation. 10,11 In our setup, the magnetic field is oriented along the zЈ direction, which is tilted by ϭ74°with respect to the growth direction ͑see Fig. 1͒.…”

Section: Depth Profilementioning

confidence: 99%

“…As a result, electric fields can also cause splittings of the nuclear spin transitions. 10 The coupling constant between the electric field and the EFG at the nuclear site has been determined for bulk GaAs by various groups. 10,11 While earlier measurements of these effects in bulk GaAs were done with conventional magnetic resonance techniques, they are not sensitive enough for measurements on quantum confined structures.…”

Section: Introductionmentioning

confidence: 99%

“…10 The coupling constant between the electric field and the EFG at the nuclear site has been determined for bulk GaAs by various groups. 10,11 While earlier measurements of these effects in bulk GaAs were done with conventional magnetic resonance techniques, they are not sensitive enough for measurements on quantum confined structures. For such systems, optical pumping, often in combination with optical detection [12][13][14] is necessary for providing sufficient sensitivity and selectivity to perform measurements on single quantum films.…”

Section: Introductionmentioning

confidence: 99%

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The usefulness of semiconductor heterostructures derives from the possibility to engineer their electronic and optical properties to match the requirements of many different applications. Optically detected nuclear magnetic resonance provides the possibility to map microscopic properties of such samples with a high spatial resolution through the splitting of resonance lines. In a multiple quantum-well sample, we measure the distortion of the crystal lattice and find variations of the order of 10 Ϫ5 over distances of a few mm. Internal electric fields also cause resonance line splittings. Comparing the electric field-induced resonance line splittings in different quantum wells, we mapped the vertical variation of the electric field from a Schottky contact with a spatial resolution of some 40 nm.

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Laser‐Assisted Magnetic Resonance: Principles and Applications

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Abstract. Laser radiation can be used in various magnetic resonance experiments. This chapter discusses a number of cases, where laser light either improves the information content of conventional experiments or makes new types of experiments possible, which could not be performed with conventional means. Sensitivity is often the main reason for using light, but it also allows one to become more selective, e.g. by selecting signals only from small parts of the sample. Examples are given for NMR, NQR, and EPR spectra that use were taken with the help of coherent optical radiation.

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Electrically induced shifts of the GaAs nuclear spin levels

Cited by 24 publications

References 10 publications

An optical NMR spectrometer for Larmor-beat detection and high-resolution POWER NMR

An optical NMR spectrometer for Larmor-beat detection and high-resolution POWER NMR

Mapping of strain and electric fields inGaAs/Alx
Eickhoff
¹
,
Lenzmann
²
,
Suter
³

et al. 2003
Phys. Rev. B
41
0
33
0
View full text Add to dashboard Cite

Laser‐Assisted Magnetic Resonance: Principles and Applications

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Electrically induced shifts of the GaAs nuclear spin levels

Cited by 24 publications

References 10 publications

An optical NMR spectrometer for Larmor-beat detection and high-resolution POWER NMR

An optical NMR spectrometer for Larmor-beat detection and high-resolution POWER NMR

Mapping of strain and electric fields inGaAs/AlxEickhoff1, Lenzmann2, Suter3 et al. 2003Phys. Rev. B410330View full textAdd to dashboardCite

Laser‐Assisted Magnetic Resonance: Principles and Applications

Contact Info

Product

Resources

About

Mapping of strain and electric fields inGaAs/Alx
Eickhoff
¹
,
Lenzmann
²
,
Suter
³

et al. 2003
Phys. Rev. B
41
0
33
0
View full text Add to dashboard Cite