The Experts below are selected from a list of 204 Experts worldwide ranked by ideXlab platform

David P Divincenzo - One of the best experts on this subject based on the ideXlab platform.

  • quantum computing and single qubit measurements using the spin filter effect invited
    Journal of Applied Physics, 1999
    Co-Authors: David P Divincenzo
    Abstract:

    Many things will have to go right for quantum computation to become a reality in the lab. For any of the presently proposed approaches involving spin states in solids, an essential requirement is that these spins should be measured at the single-Bohr-Magneton level. Fortunately, quantum computing provides a suggestion for a new approach to this seemingly almost impossible task: convert the magnetization into a charge, and measure the charge. I show how this might be done by exploiting the spin-filter effect provided by ferromagnetic tunnel barriers, used in conjunction with one-electron quantum dots.

  • Quantum computing and single-qubit measurements using the spin filter effect
    Journal of Applied Physics, 1999
    Co-Authors: David P Divincenzo
    Abstract:

    Many things will have to go right for quantum computation to become a reality in the lab. For any of the presently-proposed approaches involving spin states in solids, an essential requirement is that these spins should be measured at the single-Bohr-Magneton level. Fortunately, quantum computing provides a suggestion for a new approach to this seemingly almost impossible task: convert the magnetization into a charge, and measure the charge. I show how this might be done by exploiting the spin filter effect provided by ferromagnetic tunnel barriers, used in conjunction with one-electron quantum dots.

Y Furukawa - One of the best experts on this subject based on the ideXlab platform.

  • experimental evidence of a collinear antiferromagnetic ordering in the frustrated coal 2 o 4 spinel
    Physical Review B, 2013
    Co-Authors: B Roy, Abhishek Pandey, Qiang Zhang, T W Heitmann, David Vaknin, D C Johnston, Y Furukawa
    Abstract:

    Nuclear magnetic resonance (NMR), neutron diffaction (ND), x-ray diffraction, magnetic susceptibility and specific heat measurements on the frustrated A-site spinel CoAl2O4 compound reveal a collinear antiferromagnetic ordering below Tn = 9.8(2) K. A high quality powder sample characterized by x-ray diffraction that indicates a relatively low Co-Al inversion parameter x = 0.057(20) in (Co1-xAlx)[Al2-xCox]O4, shows a broad maximum around 15 K in magnetic susceptibility and a sharp peak at Tn in heat capacity. The average ordered magnetic moment of Co^2+ (S = 3/2) ions at the A-site is estimated to be 2.4(1) Bohr Magneton from NMR and 1.9(5) Bohr Magneton from ND which are smaller than the expected value of 3 Bohr Magneton for S = 3/2 and g = 2. Antiferromagnetic spin uctuations and correlations in the paramagnetic state are revealed from the magnetic susceptibility, NMR and ND measurements, which are due to spin frustration and site inversion effects in the system. The ND data also show short-range dynamic magnetic ordering that persists to a temperature that is almost twice Tn.

Xiao Zhou Shu - One of the best experts on this subject based on the ideXlab platform.

  • A new Faraday rotation glass with a large Verdet constant
    Journal of Applied Physics, 1994
    Co-Authors: Sui Hua Yuan, Xiao Zhou Shu
    Abstract:

    Heavily terbium‐doped boron‐silicate glasses (Tb3+10.4 at. %) with a Verdet constant (632.8 nm, room temperature) as large as −0.338 min/Oe cm, 38% larger than that of the famous FR‐5 glasses, have been made. The wavelength and temperature dependencies of the Verdet constants of samples have been investigated in the ranges of 400 to 800 nm and 100 to 300 K. The results show paramagnetic Faraday rotations. The measured susceptibilities between 77 and 300 K support this point but with an effective Bohr Magneton number 7% smaller than the theoretical value for free Tb3+ ions. Susceptibilities are further measured at temperatures from 1.5 to 100 K and magnetic fields from 0.2 to 5.0 T. The results show saturation of magnetization and give a Neel temperature of about −9 K. The effective Bohr Magneton number in the state of saturated magnetization is 55% smaller than the free ion value. These results may indicate the single ion anisotropy reduction of the magnetization of the disordered Tb3+ ions at low tempera...

Qian Niu - One of the best experts on this subject based on the ideXlab platform.

  • valley contrasting physics in graphene magnetic moment and topological transport
    Physical Review Letters, 2007
    Co-Authors: Di Xiao, Wang Yao, Qian Niu
    Abstract:

    We investigate physical properties that can be used to distinguish the valley degree of freedom in systems where inversion symmetry is broken, using graphene systems as examples. We show that the pseudospin associated with the valley index of carriers has an intrinsic magnetic moment, in close analogy with the Bohr Magneton for the electron spin. There is also a valley dependent Berry phase effect that can result in a valley contrasting Hall transport, with carriers in different valleys turning into opposite directions transverse to an in-plane electric field. These effects can be used to generate and detect valley polarization by magnetic and electric means, forming the basis for the valley-based electronics applications.

B Roy - One of the best experts on this subject based on the ideXlab platform.

  • experimental evidence of a collinear antiferromagnetic ordering in the frustrated coal 2 o 4 spinel
    Physical Review B, 2013
    Co-Authors: B Roy, Abhishek Pandey, Qiang Zhang, T W Heitmann, David Vaknin, D C Johnston, Y Furukawa
    Abstract:

    Nuclear magnetic resonance (NMR), neutron diffaction (ND), x-ray diffraction, magnetic susceptibility and specific heat measurements on the frustrated A-site spinel CoAl2O4 compound reveal a collinear antiferromagnetic ordering below Tn = 9.8(2) K. A high quality powder sample characterized by x-ray diffraction that indicates a relatively low Co-Al inversion parameter x = 0.057(20) in (Co1-xAlx)[Al2-xCox]O4, shows a broad maximum around 15 K in magnetic susceptibility and a sharp peak at Tn in heat capacity. The average ordered magnetic moment of Co^2+ (S = 3/2) ions at the A-site is estimated to be 2.4(1) Bohr Magneton from NMR and 1.9(5) Bohr Magneton from ND which are smaller than the expected value of 3 Bohr Magneton for S = 3/2 and g = 2. Antiferromagnetic spin uctuations and correlations in the paramagnetic state are revealed from the magnetic susceptibility, NMR and ND measurements, which are due to spin frustration and site inversion effects in the system. The ND data also show short-range dynamic magnetic ordering that persists to a temperature that is almost twice Tn.