Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session X21: NV Centers in DiamondFocus
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Sponsoring Units: GMAG DMP FIAP DCOMP Chair: Brian Zhou, Univ of Chicago Room: LACC 309 |
Friday, March 9, 2018 8:00AM - 8:36AM |
X21.00001: Single-spin holonomic quantum gates with coherent optical control in diamond Invited Speaker: Paul Jerger Quantum state transfer and qubit operations are routinely performed using dynamic effects prone to systematic errors. With the growing interest in fault-tolerant quantum computing, researchers have turned to purely geometric phases (and their non-Abelian generalizations, holonomic gates) as a promising paradigm for robust quantum operations. However, the intrinsically slower operation of adiabatic holonomic gates is vulnerable to decoherence, which reduces fidelities. We present a recent implementation of nonadiabatic holonomic quantum control in the nitrogen-vacancy (NV) center in diamond, which surpasses the speeds of adiabatic control without sacrificing its geometric character [1]. In this approach, arbitrary single-qubit rotations are performed in a single operation by detuning the optical fields that drive lambda system transitions. Furthermore, we explore the enhanced robustness of detuned gates to intermediate-state decoherence and present insights for optimizing fast holonomic control in dissipative quantum systems. The NV center’s rich energy level structure and spin properties enable a variety of advanced optical control techniques [2, 3] that can be translated to other promising quantum information platforms. |
Friday, March 9, 2018 8:36AM - 8:48AM |
X21.00002: Rabi spectroscopy of nitrogen-vacancy (NV) ensembles in diamond for optical magnetometry Vagharsh Mkhitaryan, Naufer Nusran, Kamal Joshi, Ruslan Prozorov We study the effect of microwave driving on the NV-centers ground state |
Friday, March 9, 2018 8:48AM - 9:00AM |
X21.00003: On-Demand Generation of Neutral and Negatively-Charged Silicon-Vacancy Centers in Diamond Siddharth Dhomkar, Pablo Zangara, Carlos Meriles Point defects in wide-bandgap semiconductors are emerging as versatile resources for nanoscale sensing and quantum information science but our understanding of the photo-ionization dynamics is presently incomplete. Here we use two-color confocal microscopy to investigate the dynamics of charge in Type 1b diamond hosting nitrogen-vacancy (NV) and silicon-vacancy (SiV) centers. By examining the non-local fluorescence patterns emerging from local laser excitation, we show that in the simultaneous presence of photo-generated electrons and holes, SiV (NV) centers selectively transform into the negative (neutral) charge state. Unlike NVs, 532 nm illumination ionizes SiV- via a single photon process thus hinting at a comparatively shallower ground state. In particular, slower ionization rates at longer wavelengths suggest the latter lies approximately ~1.9 eV below the conduction band minimum. Building on the above observations we demonstrate on-demand SiV and NV charge initialization over large areas via green laser illumination of variable intensity. |
Friday, March 9, 2018 9:00AM - 9:12AM |
X21.00004: Charge state and photoionization dynamics of surface implanted nitrogen vacancy centers in diamond Siddharth Dhomkar, pablo zangara, Harishankar Jayakumar, Carlos Meriles Ensembles of surface implanted, shallow nitrogen vacancy centers in diamond are widely used in sensing applications. Although the spin properties of superficial nitrogen-vacancy (NV) centers have been the subject of extensive scrutiny, considerable less attention has been devoted to studying the dynamics of NV charge conversion near the diamond surface. Using multi-color confocal microscopy, here we show that surface states dramatically increase the ionization and recombination rates of shallow NVs compared to those in bulk diamond. Further, we find that these rates grow linearly, and not quadratically, with laser intensity, and that the underlying charge processes ultimately impact the ability to spin-initialize NV-. In spite of the altered charge dynamics, we show we can imprint rewritable,patterns of charged-initialized, near-surface NVs over large areas, an ability that could be exploited for electrochemical biosensing or to demonstrate sub-diffraction optical data storage. |
Friday, March 9, 2018 9:12AM - 9:24AM |
X21.00005: Multi-Spin-Assisted Optical Pumping of bulk 13C nuclear spin polarization in diamond Daniela Pagliero, Rama Kamineni, Pablo Zangara, Siddharth Dhomkar, Henry Wong, Andrea Abril, Nabeel Aslam, Ashok Ajoy, Anna Parker, Jonathan King, Claudia Avalos, Joerg Wrachtrup, Alexander Pines, Carlos Meriles One of the most remarkable properties of the nitrogen-vacancy (NV) center in diamond is that optical illumination initializes its electronic spin almost completely, a feature that can be exploited to polarize other spin species in their proximity. Here we use field-cycled nuclear magnetic resonance (NMR) to investigate the mechanisms of spin polarization transfer from NVs to 13C spins in diamond at room temperature. We focus on the dynamics near 51 mT, where a fortuitous combination of energy matching conditions between electron and nuclear spin levels gives rise to alternative polarization transfer channels. By monitoring the 13C spin polarization as a function of the applied magnetic field, we show 13C spin pumping takes place via a multi-spin cross relaxation process involving the NV- spin and the electronic and nuclear spins of neighboring P1 centers. Further, we find that this mechanism is insensitive to the crystal orientation relative to the magnetic field. |
Friday, March 9, 2018 9:24AM - 9:36AM |
X21.00006: Spin-pumping into p-type diamond from NiFe Fujimoto Sho, Hiroki Morishita, Satoshi Kobayashi, Shinji Miwa, Minori Goto, Masanori Fujiwara, Yoshishige Suzuki, Norikazu Mizuochi NV centers in diamond are promising candidates for quantum sensors and quantum information science [1]. In the quantum diamond devices, initialization of electron and/or nuclear spins is required, but it has not yet been demonstrated. Toward the electrical initialization, injection of polarized electron is important, because it may be used for it [2]. Here, we focus on a spin-pumping technique to demonstrate the spin-injection into diamond. |
Friday, March 9, 2018 9:36AM - 9:48AM |
X21.00007: Phononic Crystal Based Spin-Mechanical Systems in Diamond Ignas Lekavicius, Thein Oo, Hailin Wang We report on the design and fabrication of GHz diamond mechanical resonators embedded in a two-dimensional phononic crystal lattice that features a bandgap centered around 1 GHz with a gap size of 300 MHz. The phononic bandgap isolates and protects the mechanical resonator from the clamping loss. The GHz mechanical mode couples to color centers, such as nitrogen vacancy centers and silicon vacancy centers, implanted in the diamond mechanical resonator in the resolved sideband regime. Experimental results on spin-mechanical interactions through the excited-state strain coupling will also be discussed. |
Friday, March 9, 2018 9:48AM - 10:00AM |
X21.00008: Ab initio calculation of spin lattice relaxation of NV- centers in diamond Johannes Gugler, Peter Mohn We investigate on the fundamental mechanism of spin phonon coupling in the negatively charged nitrogen vacancy center (NV-) in diamond in order to calculate the spin lattice relaxation time T1 and its temperature dependence. Starting from the dipolar spin-spin interaction between two electrons, we couple the spins of the electron to the movements of the ions and end up with an effective spin-phonon interaction potential. Taking this time dependent potential as a perturbation of the system leads to Fermi's golden rule for transition rates which allows to calculate the spin lattice relaxation time T1. We simulate the color center with the Vienna Ab Initio Simulation Package (VASP) to extract the figures necessary to quantify T1. |
Friday, March 9, 2018 10:00AM - 10:12AM |
X21.00009: NV-center relaxometry of magnetic insulating systems Benedetta Flebus NV-centers have been recently growing into popularity due to their minimally invasive and high resolution magnetic field sensing. In this work, we specifically focus on NV-centers relaxometry as a method of probing of collective excitations in magnetic insulators. We develop a general framework that connects the experimentally-measurable relaxation times of the probe to the properties of the magnetic system in terms of the transverse and longitudinal noise emitted by the later. Providing a first rigorous definition for the chemical potential of an antiferromagnetic system, we discuss how it can be extracted via a noise local measurement. Moreover, our results show that NV-relaxometry can be effectively deployed to image low-lying collective excitations such as antiferromagnetic solitons, as well as they open up new prospects in probing transport properties and regimes of spin waves in the absence of interfacial effects. |
Friday, March 9, 2018 10:12AM - 10:24AM |
X21.00010: Electrical Detection and Control of 14N Nuclear Spin Coherence in NV centers at Room Temperature Hiroki Morishita, Satoshi Kobayashi, Masanori Fujiwara, Hiromitsu Kato, Toshiharu Makino, Satoshi Yamasaki, Norikazu Mizuochi Nitrogen-vacancy (NV) centers in diamond are candidates for realizing quantum information processing devices and quantum sensors because their electron spins have a long coherence time at room temperature. The electron spins can be detected by an optical and electrical method [1, 2]. For the further development of the electrical method, here we demonstrated electrical detection and control of a nuclear-spin coherence with an electrically detected electron-nuclear double resonance (EDENDOR) [3]. Using the EDENDOR technique, we observed Rabi oscillations and coherence time (T2) of the 14N nuclear spins in NV centers at room temperature. These results are first demonstrations of electrical detection and control of nuclear spin coherence not only in diamond but also in other materials at room temperature. |
Friday, March 9, 2018 10:24AM - 10:36AM |
X21.00011: Probing local current fluctuations in graphene with NV magnetometry Bo Dwyer, Trond Andersen, Javier Sanchez-Yamagishi, Takashi Taniguchi, Kenji Watanabe, Hongkun Park, Mikhail Lukin Nitrogen Vacancy (NV) color centers in diamond are sensitive nanoscale magnetometers. We use this sensor to measure local current fluctuations in a biased graphene device in the electron hydrodynamic regime. We observe an anomalous current noise signal that is much larger than expected from Johnson-Nyquist noise in both global electronic noise and local NV center measurements. Furthermore, this signal exhibits strong asymmetries as a function of current direction and charge carrier sign. The local nature of this measurement technique allows us to also measure the spatial variation of this signal along the length of the device. I will discuss possible mechanisms for this noise generation and compare qualitative differences between the global and local noise measurements. |
Friday, March 9, 2018 10:36AM - 10:48AM |
X21.00012: Ferromagnetism in quantum dots Yuri Dahnovsky We consider d0 ferromagnetism where Zn vacancies in ZnS semiconductor nanocrystals (NC) (quantum dots and nanowires). The absence of Zn atoms exhibits the ferromagnetic order at room temperatures. We find a magnetic moment in large quantum dots and nanowires by introducing a new model, the surface-bulk model, where a NC magnetic moment is presented as a sum of the surface and bulk contributions. We find how the magnetic moment depends on the concentration and size of a nanocrystal. In addition we discovered the large, three orders of magnitude discrepancy between the experimental and calculated magnetic moments. Such a large disagreement between the experiment and theory is explained due to the condensation of impurities inside a nanocrystal. |
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