41 citations · 271 across the 19 of their papers we have counts for
19 papers
Controlled creation and annihilation of stringless robust emergent magnetic monopoles in artificial spin ice
N. Keswani, R. Lopes, Y. Nakajima +6
Magnetic analogue of an isolated free electric charge, i.e., a magnet with a single north or south pole, is a long sought-after particle which remains elusive so far. In magnetical…
Bilayer artificial spin ice: magnetic force switching and basic thermodynamics
Fabio S. Nascimento, Afranio R. Pereira, Winder A. Moura-Melo
We study an artificial spin ice system consisting of two identical layers separated by a height offset . For small separation, the layers are shown to attract each other, provid…
Realization of Rectangular Artificial Spin Ice and Direct Observation of High Energy Topology
I. R. B. Ribeiro, F. S. Nascimento, S. O. Ferreira +7
In this letter, we have constructed and experimentally investigated frustrated arrays of dipoles forming two-dimensional artificial spin ices with different lattice parameters (rec…
Berry phases and zero-modes in toroidal topological insulator
J. M. Fonseca, V. L. Carvalho-Santos, W. A. Moura-Melo +1
An effective Hamiltonian describing the surface states of a toroidal topological insulator is obtained, and it is shown to support both bound-states and charged zero-modes. Actuall…
Topological cutoff frequency in a slab waveguide: Penetration length in topological insulator walls
Thiago M. Melo, Davidson R. Viana, Winder A. Moura-Melo +2
We study the propagation of electromagnetic (EM) waves in a slab-type waveguide which walls consist of three-dimensional topological insulator (3D TI). The results show that a cuto…
Klein Tunneling of Spin Polarized Currents in HgTe Quantum Wells
Davidson R. Viana, Thiago M. Melo, Jakson M. Fonseca +3
We investigate the behavior of spin polarized currents in two-dimensional topological insulators (TI). Stationary solutions inside a HgTe/CdTe quantum well (QW) were obtained by Be…