A multifrequency high-field pulsed electron paramagnetic resonance/electron-nuclear double resonance spectrometer

Morley, Gavin W.; Brunel, Louis‐Claude; Tol, Johan van

doi:10.1063/1.2937630

Cited by 86 publications

(67 citation statements)

References 28 publications

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“…Electron spin transitions are driven using a custom built spectrometer which operates at 240 GHz 21,22 , and which also contains an NMR coil to drive the nuclear spin transitions (f n 1 = 88.60 MHz, f n 2 = 201.24 MHz at B = 8.56370 T). The position and line shape was determined using the same proceedure as in Ref.…”

Section: Electrically Detecting Nuclear Spin Hahn Echoesmentioning

confidence: 99%

Electrically detected spin echoes of donor nuclei in silicon

et al. 2012

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The ability to probe the spin properties of solid state systems electrically underlies a wide variety of emerging technology. Here, we demonstrate electrical readout of the nuclear spin states of phosphorus donors in silicon in the coherent regime with modified Hahn echo sequences. We find that, whilst the nuclear spins have electrically detected phase coherence times exceeding 2 ms, they are nonetheless limited by the artificially shortened lifetime of the probing donor electron.

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Section: Electrically Detecting Nuclear Spin Hahn Echoesmentioning

confidence: 99%

Electrically detected spin echoes of donor nuclei in silicon

et al. 2012

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“…Several pulsed HFEPR spectrometers above 150 GHz has been constructed around the world, including Frankfurt [16], Berlin [17], Leiden [18] and Tallahassee [19,20]. In addition, a 263 GHz EPR spectrometer has recently been commercially available from Bruker Biospin [21].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, a 263 GHz EPR spectrometer has recently been commercially available from Bruker Biospin [21]. A trend of pulsed HFEPR spectroscopy is toward enhancement of excitation power to improve the time resolution and applications of multi-frequency, multi-dimensional and sophisticated pulsed techniques [12,20,[22][23][24][25]. A high-power HFEPR spectrometer based on a free-electron laser has been developed recently to realize pulsed EPR measurements with several nanosecond pulses [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

A high-frequency electron paramagnetic resonance spectrometer for multi-dimensional, multi-frequency, and multi-phase pulsed measurements

Cho

Stepanov

Takahashi

2014

Review of Scientific Instruments

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We describe instrumentation for a high-frequency electron paramagnetic resonance (EPR) and pulsed electron-electron double resonance (PELDOR) spectroscopy. The instrumentation is operated in the frequency range of 107−120 GHz and 215−240 GHz and in the magnetic field range of 0−12.1 Tesla. The spectrometer consisting of a high-frequency high-power solid-state source, a quasioptical system, a phase-sensitive detection system, a cryogenic-free superconducting magnet and a 4 He cryostat enables multi-frequency continuous-wave EPR spectroscopy as well as pulsed EPR measurements with a few hundred nanosecond pulses. Here we discuss the details of the design and the pulsed EPR sensitivity of the instrumentation. We also present performance of the instrumentation in unique experiments including PELDOR spectroscopy to probe correlations in an insulating electronic spin system and application of dynamical decoupling techniques to extend spin coherence of electron spins in an insulating solid-state system. * Electronic address: susumu.takahashi@usc.edu

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“…The setup is based on a superheterodyne quasioptical bridge with a 40 mW solid state source. Details of the EPR setup are described elsewhere [25,26]. No optical excitation was applied throughout this work, and no resonator was used for either cw or pulsed experiments.…”

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confidence: 99%

Quenching Spin Decoherence in Diamond through Spin Bath Polarization

et al. 2008

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We experimentally demonstrate that the decoherence of a spin by a spin bath can be completely eliminated by fully polarizing the spin bath. We use electron paramagnetic resonance at 240 GHz and 8 T to study the electron-spin coherence time T 2 of nitrogen-vacancy centers and nitrogen impurities in diamond from room temperature down to 1.3 K. A sharp increase of T 2 is observed below the Zeeman energy (11.5 K). The data are well described by a suppression of the flip-flop induced spin bath fluctuations due to thermal electron-spin polarization. T 2 saturates at 250 s below 2 K, where the polarization of the electron-spin bath exceeds 99%. DOI: 10.1103/PhysRevLett.101.047601 PACS numbers: 76.30.Mi, 03.65.Yz Overcoming spin decoherence is critical to spintronics and spin-based quantum information processing devices [1,2]. For spins in the solid state, a coupling to a fluctuating spin bath is a major source of the decoherence. Therefore, several recent theoretical and experimental efforts have aimed at suppressing spin bath fluctuations [3][4][5][6][7][8][9]. One approach is to bring the spin bath into a well-known quantum state that exhibits little or no fluctuations [10,11]. A prime example is the case of a fully polarized spin bath. The spin bath fluctuations are fully eliminated when all spins are in the ground state. In quantum dots, nuclear spin bath polarizations of up to 60% have been achieved [12,13]. However, a polarization above 90% is needed to significantly increase the spin coherence time [14]. Moreover, thermal polarization of the nuclear spin bath is experimentally challenging due to the small nuclear magnetic moment. Electron-spin baths, however, may be fully polarized thermally at a few degrees of Kelvin under an applied magnetic field of 8 T.Here we investigate the relationship between the spin coherence of nitrogen-vacancy (N-V) centers in diamond and the polarization of the surrounding spin bath consisting of nitrogen (N) electron spins. N-V centers consist of a substitutional nitrogen atom adjoining to a vacancy in the diamond lattice. The N-V center, which has long spin coherence times at room temperature [15,16], is an excellent candidate for quantum information processing applications as well as conducting fundamental studies of interactions with nearby electronic spins [16 -18] and nuclear spins [19,20]. In the case of type-Ib diamond, as studied here, the coupling to a bath of N electron spins is the main source of decoherence for an N-V center spin [15,21]. We have measured the spin coherence time (T 2 ) and spin-lattice relaxation time (T 1 ) in spin ensembles of N-V centers and single N impurity centers (P1 centers) using pulsed electron paramagnetic resonance (EPR) spectroscopy at 240 GHz. By comparing the values of T 1 and T 2 at different temperatures, we verify that the mechanism determining T 2 is different from that of T 1 . Next, we investigate the temperature dependence of T 2 .At 240 GHz and 8.6 T where the Zeeman energy of the N centers corresponds to 11.5 K, the polariza...

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A multifrequency high-field pulsed electron paramagnetic resonance/electron-nuclear double resonance spectrometer

Cited by 86 publications

References 28 publications

Electrically detected spin echoes of donor nuclei in silicon

Electrically detected spin echoes of donor nuclei in silicon

A high-frequency electron paramagnetic resonance spectrometer for multi-dimensional, multi-frequency, and multi-phase pulsed measurements

Quenching Spin Decoherence in Diamond through Spin Bath Polarization

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