Related papers: Magnetic field dependence of $V_B^-$ Defects in hexagonal boron nitride

Magnetic field dependence of $V_B^-$ Defects in hexagonal boron nitride

URL: http://arxiv.org/abs/2410.06755v1
Date: Wed, 9 Oct 2024 10:40:05 GMT
Title: Magnetic field dependence of $V_B^-$ Defects in hexagonal boron nitride
Authors: Mulin Zheng, Shizhuo Ale, Peiqin Chen, Jingpu Tu, Qiang Zhou, Haizhi Song, You Wang, Junfeng Wang, Guangcan Guo, Guangwei Deng,
Abstract summary: We study the influence of off-axis magnetic fields on the coherence properties of $V_B-$ defects in hBN. Results are crucial for optimizing $V_B-$ defects in hBN, establishing their significance as robust quantum sensors.
Score: 5.426508182505848
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: The interface with spin defects in hexagonal boron nitride has recently become a promising platform and has shown great potential in a wide range of quantum technologies. Varieties of spin properties of $V_B^-$ defects in hexagonal boron nitride (hBN) have been researched widely and deeply, like their structure and coherent control. However, little is known about the influence of off-axis magnetic fields on the coherence properties of $V_B^-$ defects in hBN. Here, by using the optically detected magnetic resonance (ODMR) spectroscopy, we systematically investigated the variations in ODMR resonance frequencies under different transverse and longitudinal external magnetic field, respectively. In addition, we measured the ODMR spectra under off-axis magnetic fields of constant strength but various angles, and observed that the splitting of the resonance frequencies decreases as the angle increases, aligning with our theoretical calculation based on the Hamiltonian, from which we come up with a solution of detecting the off-axis magnetic field angle. Through Rabi oscillation measurements, we found that the off-axis magnetic field suppresses the spin coherence time. These results are crucial for optimizing $V_B^-$ defects in hBN, establishing their significance as robust quantum sensors for quantum information processing and magnetic sensing in varied environments.

Related papers

Spin projection noise and the magnetic sensitivity of optically pumped magnetometers [0.0]
We present a new approach for calculating the spin projection noise (SPN)-limited signal to noise ratio (SNR) and the magnetic sensitivity of OPMs. Our model is based solely on the mean-field density matrix dynamics. We report on a new SERF feature; the reduction of spin-projection noise at the spin precession frequency as a consequence of strongly-correlated hyperfine spins.
arXiv Detail & Related papers (2024-02-16T15:11:46Z)
Study on the effects of anisotropic effective mass on electronic properties, magnetization and persistent current in semiconductor quantum ring with conical geometry [2.3353925077667923]
We study a 2D mesoscopic ring with an anisotropic effective mass considering surface quantum confinement effects. We demonstrate through numerical analysis that the electronic properties, the magnetization, and the persistent current undergo significant changes due to quantum confinement and non-isotropic mass.
arXiv Detail & Related papers (2023-11-16T12:40:08Z)
Magnetic-field-induced cavity protection for intersubband polaritons [52.77024349608834]
We analyse the effect of a strong perpendicular magnetic field on an intersubband transition in a disordered doped quantum well strongly coupled to an optical cavity. The magnetic field changes the lineshape of the intersubband optical transition due to the roughness of the interface of the quantum well from a Lorentzian to a Gaussian one.
arXiv Detail & Related papers (2022-10-14T18:00:03Z)
Measuring the magnon-photon coupling in shaped ferromagnets: tuning of the resonance frequency [50.591267188664666]
cavity photons and ferromagnetic spins excitations can exchange information coherently in hybrid architectures. Speed enhancement is usually achieved by optimizing the geometry of the electromagnetic cavity. We show that the geometry of the ferromagnet plays also an important role, by setting the fundamental frequency of the magnonic resonator.
arXiv Detail & Related papers (2022-07-08T11:28:31Z)
High-resolution spectroscopy of a single nitrogen-vacancy defect at zero magnetic field [0.3848364262836075]
We report a study of high-resolution microwave spectroscopy of nitrogen-vacancy centers in diamond crystals at and around zero magnetic field. We observe characteristic splitting and transition imbalance of the hyperfine transitions, which originate from level anti-crossings in the presence of a transverse effective field. Our results are of importance for the optimization of the experimental conditions for the polarization-selective microwave excitation of spin-1 systems in zero or weak magnetic fields.
arXiv Detail & Related papers (2022-06-30T02:49:49Z)
DC Quantum Magnetometry Below the Ramsey Limit [68.8204255655161]
We demonstrate quantum sensing of dc magnetic fields that exceeds the sensitivity of conventional $Tast$-limited dc magnetometry by more than an order of magnitude. We used nitrogen-vacancy centers in a diamond rotating at periods comparable to the spin coherence time, and characterize the dependence of magnetic sensitivity on measurement time and rotation speed.
arXiv Detail & Related papers (2022-03-27T07:32:53Z)
Excited-state spectroscopy of spin defects in hexagonal boron nitride [20.739656944743345]
We probed electron-spin resonance transitions in the excited state of negatively-charged boron vacancy defects in hexagonal boron nitride (hBN) at room temperature. The data showed that the excited state has a zero-field splitting of 2.1 GHz, a g factor similar to the ground state and two types of hyperfine splitting 90 MHz and 18.8 MHz respectively. Negative peaks in photoluminescence and ODMR contrast as a function of magnetic field magnitude and angle at level anti-crossing were observed and explained by coherent spin precession and anisotropic relaxation.
arXiv Detail & Related papers (2021-12-06T10:28:57Z)
Rotating Majorana Zero Modes in a disk geometry [75.34254292381189]
We study the manipulation of Majorana zero modes in a thin disk made from a $p$-wave superconductor. We analyze the second-order topological corner modes that arise when an in-plane magnetic field is applied. We show that oscillations persist even in the adiabatic phase because of a frequency independent coupling between zero modes and excited states.
arXiv Detail & Related papers (2021-09-08T11:18:50Z)
Surpassing the Energy Resolution Limit with ferromagnetic torque sensors [55.41644538483948]
We evaluate the optimal magnetic field resolution taking into account the thermomechanical noise and the mechanical detection noise at the standard quantum limit. We find that the Energy Resolution Limit (ERL), pointed out in recent literature, can be surpassed by many orders of magnitude.
arXiv Detail & Related papers (2021-04-29T15:44:12Z)
Sub-nanoscale Temperature, Magnetic Field and Pressure sensing with Spin Centers in 2D hexagonal Boron Nitride [0.0]
We show that negatively charged boron vacancies ($V_B-$) in hexagonal boron nitride (hBN) can be used as atomic scale sensors. These applications are possible due to the high-spin triplet ground state and bright spin-dependent photoluminescence. Our work is important for the future use of spin-rich hBN layers as sensors in heterostructures of functionalized 2D materials.
arXiv Detail & Related papers (2021-02-22T10:52:15Z)
Mechanical Decoupling of Quantum Emitters in Hexagonal Boron Nitride from Low-Energy Phonon Modes [52.77024349608834]
Quantum emitters in hexagonal Boron Nitride (hBN) were recently reported to hol a homogeneous linewidth according to the Fourier-Transform limit up to room temperature. This unusual observation was traced back to decoupling from in-plane phonon modes which can arise if the emitter is located between two planes of the hBN host material.
arXiv Detail & Related papers (2020-04-22T20:00:49Z)

This list is automatically generated from the titles and abstracts of the papers in this site.