TY - JOUR

T1 - Sensitive detection of level anticrossing spectra of nitrogen vacancy centers in diamond

AU - Anishchik, S. V.

AU - Ivanov, K. L.

PY - 2017/9/21

Y1 - 2017/9/21

N2 - We report a study of the magnetic field dependence of photoluminescence of NV- centers (negatively charged nitrogen vacancy centers) in diamond single crystals. In such a magnetic field dependence characteristic sharp features are observed, which are coming from level anticrossings (LACs) in a coupled electron-nuclear spin system. For studying such LAC lines we use sensitive lock-in detection to measure the photoluminescence intensity. This experimental technique allows us to obtain new LAC lines. Additionally, a remarkably strong dependence of the LAC lines on the modulation frequency is found. Specifically, upon decrease of the modulation frequency from 12 kHz to 17 Hz the amplitude of the LAC lines increases by approximately two orders of magnitude. To take a quantitative account for such effects, we present a theoretical model, which describes the spin dynamics in a coupled electron-nuclear spin system under the action of an oscillating external magnetic field. Good agreement between experiments and theory allows us to conclude that the observed effects are originating from coherent spin polarization exchange in a coupled spin system comprising the spin-polarized NV- center. Our results are of great practical importance allowing one to optimize the experimental conditions for probing LAC-derived lines in diamond crystals comprising NV- centers and for indirect detection and identification of other paramagnetic defect centers.

AB - We report a study of the magnetic field dependence of photoluminescence of NV- centers (negatively charged nitrogen vacancy centers) in diamond single crystals. In such a magnetic field dependence characteristic sharp features are observed, which are coming from level anticrossings (LACs) in a coupled electron-nuclear spin system. For studying such LAC lines we use sensitive lock-in detection to measure the photoluminescence intensity. This experimental technique allows us to obtain new LAC lines. Additionally, a remarkably strong dependence of the LAC lines on the modulation frequency is found. Specifically, upon decrease of the modulation frequency from 12 kHz to 17 Hz the amplitude of the LAC lines increases by approximately two orders of magnitude. To take a quantitative account for such effects, we present a theoretical model, which describes the spin dynamics in a coupled electron-nuclear spin system under the action of an oscillating external magnetic field. Good agreement between experiments and theory allows us to conclude that the observed effects are originating from coherent spin polarization exchange in a coupled spin system comprising the spin-polarized NV- center. Our results are of great practical importance allowing one to optimize the experimental conditions for probing LAC-derived lines in diamond crystals comprising NV- centers and for indirect detection and identification of other paramagnetic defect centers.

KW - N-V CENTERS

KW - COLOR-CENTERS

KW - ELECTRON-SPIN

KW - SINGLE SPINS

KW - SPECTROSCOPY

KW - DYNAMICS

KW - ENTANGLEMENT

KW - MICROSCOPY

KW - RESOLUTION

KW - RESONANCE

UR - http://www.scopus.com/inward/record.url?scp=85030096853&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.96.115142

DO - 10.1103/PhysRevB.96.115142

M3 - Article

AN - SCOPUS:85030096853

VL - 96

JO - Physical Review B

JF - Physical Review B

SN - 2469-9950

IS - 11

M1 - 115142

ER -