宽隙半导体中的高自旋缺陷(色心)由于其自旋的独特组合而被认为是实现量子技术的基础,光学,charge,和连贯的属性。碳化硅(SiC)晶体可以充当各种光学活性空位型缺陷的基质,它们表现为单光子源或自旋量子比特。在缺陷中,氮空位中心(NV)是特别重要的。本文致力于在高频范围(94GHz)上应用光诱导电子顺磁共振(EPR)和电子-核双共振(ENDOR)技术,以获得有关NV缺陷的性质和性质的独特信息。六角形4H和6H多型体的SiC晶体。通过微波和射频脉冲的选择性激发可以确定颜色中心的微观结构,零场分裂常数(D=1.2-1.3GHz),相位相干时间(T2),以及超精细(≈1.1MHz)和四极(Cq≈2.45MHz)相互作用的值,并定义了电子-核相互作用的各向同性(a=-1.2MHz)和各向异性(b=10-20kHz)贡献。获得的数据对于在SiC中实现NV缺陷作为量子寄存器至关重要,使电子自旋的光学初始化建立自旋-光子界面。此外,光学的组合,微波炉,和对SiC晶体内自旋中心的射频谐振效应显示了采用脉冲EPR和ENDOR序列来实现量子计算算法和门的协议的潜力。
High-spin defects (color centers) in wide-gap semiconductors are considered as a basis for the implementation of quantum technologies due to the unique combination of their spin, optical, charge, and coherent properties. A silicon carbide (SiC) crystal can act as a matrix for a wide variety of optically active vacancy-type defects, which manifest themselves as single-photon sources or spin qubits. Among the defects, the nitrogen-vacancy centers (NV) are of particular importance. This paper is devoted to the application of the photoinduced electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) techniques at a high-frequency range (94 GHz) to obtain unique information about the nature and properties of NV defects in SiC crystal of the hexagonal 4H and 6H polytypes. Selective excitation by microwave and radio frequency pulses makes it possible to determine the microscopic structure of the color center, the zero-field splitting constant (D = 1.2-1.3 GHz), the phase coherence time (T2), and the values of hyperfine (≈1.1 MHz) and quadrupole (Cq ≈ 2.45 MHz) interactions and to define the isotropic (a = -1.2 MHz) and anisotropic (b = 10-20 kHz) contributions of the electron-nuclear interaction. The obtained data are essential for the implementation of the NV defects in SiC as quantum registers, enabling the optical initialization of the electron spin to establish spin-photon interfaces. Moreover, the combination of optical, microwave, and radio frequency resonant effects on spin centers within a SiC crystal shows the potential for employing pulse EPR and ENDOR sequences to implement protocols for quantum computing algorithms and gates.