Suppression of nuclear polarization near the surface of optically pumped GaAs

Fitzsimmons, M. R.; Kirby, Brian J.; Hengartner, Nicolas W.; Trouw, F.; Erickson, M. J.; Flexner, Soren; Kondo, Takashi; Adelmann, Christoph; Palmstrøm, C. J.; Crowell, P. A.; Chen, Wangchun; Gentile, Thomas R.; Borchers, J. A.; Majkrzak, C. F.; Pynn, R.

doi:10.1103/physrevb.76.245301

Cited by 9 publications

(5 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Solid lines show the same quantities obtained from the fit. level on the surface states in the middle of the GaAs bandgap [39], such electric field could, in principle, ionize the donors, preventing dynamic polarization of nuclear spins by localized electrons [32,33]. Moreover, we have conducted EBIC characterization of the sample.…”

Section: Experiments Versus Theory: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Warm-up spectroscopy of quadrupole-split nuclear spins in n-GaAs epitaxial layers

Litvyak,

Cherbunin,

Kalevich

et al. 2021

Preprint

View full text Add to dashboard Cite

The efficiency of the adiabatic demagnetization of nuclear spin system (NSS) of a solid is limited, if quadrupole effects are present. Nevertheless, despite a considerable quadrupole interaction, recent experiments validated the thermodynamic description of the NSS in GaAs. This suggests that nuclear spin temperature can be used as the universal indicator of the NSS state in presence of external perturbations. We implement this idea by analyzing the modification of the NSS temperature in response to an oscillating magnetic field at various frequencies, an approach termed as the warm-up spectroscopy. It is tested in a n-GaAs sample where both mechanical strain and built-in electric field may contribute to the quadrupole splitting, yielding the parameters of electric field gradient tensors for 75 As and both Ga isotopes, 69 Ga and 71 Ga.

show abstract

Section: Experiments Versus Theory: Discussionmentioning

confidence: 99%

“…In this case, one can expect shear strains in xz and yz planes to be zero. Electric fields, if present, created by the surface charge or doping gradient, are always directed along zaxis [32,33]. Under these assumptions, the Hamiltonian of the NSS in the presence of quadrupole interaction reads:…”

Section: Theorymentioning

confidence: 99%

Warm-up spectroscopy of quadrupole-split nuclear spins in n-GaAs epitaxial layers

Litvyak,

Cherbunin,

Kalevich

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Because of the weak interaction between neutrons and most materials, one can implement sophisticated sample environments for PNR experiments, including high magnetic fields and low temperatures [39], mechanical gadgets to apply bending stress to substrates [43] and devices allowing light irradiation [44]. See [36,45] for more details on the PNR technique.…”

Section: Polarized Neutron Reflectometerymentioning

confidence: 99%

Interfacial magnetism in complex oxide heterostructures probed by neutrons and x-rays

Liu¹,

Ke²

2015

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

Magnetic complex-oxide heterostructures are of keen interest because a wealth of phenomena at the interface of dissimilar materials can give rise to fundamentally new physics and potentially valuable functionalities. Altered magnetization, novel magnetic coupling and emergent interfacial magnetism at the epitaxial layered-oxide interfaces are under intensive investigation, which shapes our understanding on how to utilize those materials, particularly for spintronics. Neutron and x-ray based techniques have played a decisive role in characterizing interfacial magnetic structures and clarifying the underlying physics in this rapidly developing field. Here we review some recent experimental results, with an emphasis on those studied via polarized neutron reflectometery and polarized x-ray absorption spectroscopy. We conclude with some perspectives.

show abstract

“…Recombination centres may be ionized in the regions where the electric fi eld exceeds ~ 5,000 V cm − 1 (ref. 17 ). Th e approximate width of the depletion layer is given by (ref.…”

Section: Stray-fi Eld Imaging Nmr Imaging Is a Well-established Tecmentioning

confidence: 99%

Optically rewritable patterns of nuclear magnetization in gallium arsenide

King

Meriles

et al. 2012

Nat Commun

View full text Add to dashboard Cite

The control of nuclear spin polarization is important to the design of materials and algorithms for spin-based quantum computing and spintronics. Towards that end, it would be convenient to control the sign and magnitude of nuclear polarization as a function of position within the host lattice. Here we show that, by exploiting different mechanisms for electron -nuclear interaction in the optical pumping process, we are able to control and image the sign of the nuclear polarization as a function of distance from an irradiated GaAs surface. This control is achieved using a crafted combination of light helicity, intensity and wavelength, and is further tuned via use of NMR pulse sequences. These results demonstrate all-optical creation of micron scale, rewritable patterns of positive and negative nuclear polarization in a bulk semiconductor without the need for ferromagnets, lithographic patterning techniques, or quantum-confi ned structures.

show abstract

Suppression of nuclear polarization near the surface of optically pumped GaAs

Cited by 9 publications

References 21 publications

Warm-up spectroscopy of quadrupole-split nuclear spins in n-GaAs epitaxial layers

Warm-up spectroscopy of quadrupole-split nuclear spins in n-GaAs epitaxial layers

Interfacial magnetism in complex oxide heterostructures probed by neutrons and x-rays

Optically rewritable patterns of nuclear magnetization in gallium arsenide

Contact Info

Product

Resources

About