Optical-pumping double-resonance NMR system for semiconductors

Goto, Atsushi; Ohki, Shinobu; Hashi, Kenjiro; Shimizu, Tadashi

doi:10.1063/1.2349604

Cited by 18 publications

(11 citation statements)

References 13 publications

(5 reference statements)

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“…5,8,9 To date, few detailed descriptions of ONMR instrumentation and procedures have been presented. 13,15 The goal of the present paper is to present the features of our apparatus that enable the unique combination of optical NMR with both LBD and POWER NMR imaging. Many aspects are equally relevant to alternate versions of optically detected NMR.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…In this article, we have described the scheme of the surfacesensitive NMR in optically pumped semiconductors and shown its feasibility with the example of InP wafers. [13,14] The scheme provides a basis for the nuclear spin polarizer, an interface-sensitive NMR in optically pumped semiconductors. [9,10,11]…”

Section: Discussionmentioning

confidence: 99%

“…We have previously reported successive polarization transfer experiments in indium phosphide. [13,14] Here, we discuss the results in the context of the surface-sensitive NMR. The sample used was a 350 µm-thick wafer of the semi-insulating iron-doped InP with the crystal orientation of (100) and the carrier density at room temperature ρ = 7 × 10 7 cm −3 .…”

Section: Surface-sensitive Nmr In Inpmentioning

confidence: 99%

Surface-sensitive NMR in optically pumped semiconductors

et al. 2008

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We present a scheme of surface-sensitive nuclear magnetic resonance in optically pumped semiconductors, where an NMR signal from a part of the surface of a bulk compound semiconductor is detected apart from the bulk signal. It utilizes optically oriented nuclei with a long spin-lattice relaxation time as a polarization reservoir for the second (target) nuclei to be detected. It provides a basis for the nuclear spin polarizer [IEEE Trans. Appl. Supercond. 14, 1635 (2004)], which is a polarization reservoir at a surface of the optically pumped semiconductor that polarizes nuclear spins in a target material in contact through the nanostructured interfaces.Comment: 4 pages, 5 figure

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“…The sample stage is cooled through thermal contact with the cold head of the cryostat. Infrared light emitted from a Ti:Sapphire laser is delivered to the cryostat through a polarization-maintaining fibre 27 . It is converted to circularly polarized light by a quarter-wave plate at the probe head, and applied to the sample in parallel to the magnetic field.…”

Section: Methodsmentioning

confidence: 99%

Optical switching of nuclear spin–spin couplings in semiconductors

et al. 2011

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Two-qubit operation is an essential part of quantum computation. However, solid-state nuclear magnetic resonance quantum computing has not been able to fully implement this functionality, because it requires a switchable inter-qubit coupling that controls the time evolutions of entanglements. Nuclear dipolar coupling is beneficial in that it is present whenever nuclear–spin qubits are close to each other, while it complicates two-qubit operation because the qubits must remain decoupled to prevent unwanted couplings. Here we introduce optically controllable internuclear coupling in semiconductors. The coupling strength can be adjusted externally through light power and even allows on/off switching. This feature provides a simple way of switching inter-qubit couplings in semiconductor-based quantum computers. In addition, its long reach compared with nuclear dipolar couplings allows a variety of options for arranging qubits, as they need not be next to each other to secure couplings.

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Optical-pumping double-resonance NMR system for semiconductors

Cited by 18 publications

References 13 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

Surface-sensitive NMR in optically pumped semiconductors

Optical switching of nuclear spin–spin couplings in semiconductors

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