Mechanical, electronic, and optical properties of Bi2S3 and Bi2Se3
... the more important information that can be obtained from ground state total energy calculations. The Cij determine the response of the crystal to external forces characterized by the bulk modulus, Young’s modulus, shear modulus, and Poisson’s ratio and, therefore, play an important part in determini ...
... the more important information that can be obtained from ground state total energy calculations. The Cij determine the response of the crystal to external forces characterized by the bulk modulus, Young’s modulus, shear modulus, and Poisson’s ratio and, therefore, play an important part in determini ...
Recitation on Electric Fields Solution
... (a) Torque exerted by electrostatic force on positive charge τ = R ×F = −aF sin θ = −qEa sin θ. Torque exerted by electrostatic force on negative charge τ = −qEa sin θ. The electrostatic forces result in a net torque τ = −2qEa sin θ. For small θ, sin ≈ θ, we have τ = −2qEaθ. Also, from analogy of Ne ...
... (a) Torque exerted by electrostatic force on positive charge τ = R ×F = −aF sin θ = −qEa sin θ. Torque exerted by electrostatic force on negative charge τ = −qEa sin θ. The electrostatic forces result in a net torque τ = −2qEa sin θ. For small θ, sin ≈ θ, we have τ = −2qEaθ. Also, from analogy of Ne ...
ElectricityDay1
... have different permittivities , and Coulomb’s law has a more general form: F = (1/[4])q1q2 / r 2. If the two electrons are embedded in a chunk of quartz, having a permittivity of 120, what will the Coulomb force be between them if they are 1.0 cm apart? SOLUTION: F = (1/[4])q1q2 / r 2 ...
... have different permittivities , and Coulomb’s law has a more general form: F = (1/[4])q1q2 / r 2. If the two electrons are embedded in a chunk of quartz, having a permittivity of 120, what will the Coulomb force be between them if they are 1.0 cm apart? SOLUTION: F = (1/[4])q1q2 / r 2 ...
Axion Induced Oscillating Electric Dipole Moments
... The same issue arises in the case of the anomaly. The result is intrinsically oscillatory (the nonlocal makes the source for the vector potential transverse, ie, not Coulombic) . The above Feynman amplitudes can be written as : ...
... The same issue arises in the case of the anomaly. The result is intrinsically oscillatory (the nonlocal makes the source for the vector potential transverse, ie, not Coulombic) . The above Feynman amplitudes can be written as : ...
Dielectric
A dielectric material (dielectric for short) is an electrical insulator that can be polarized by an applied electric field. When a dielectric is placed in an electric field, electric charges do not flow through the material as they do in a conductor, but only slightly shift from their average equilibrium positions causing dielectric polarization. Because of dielectric polarization, positive charges are displaced toward the field and negative charges shift in the opposite direction. This creates an internal electric field that reduces the overall field within the dielectric itself. If a dielectric is composed of weakly bonded molecules, those molecules not only become polarized, but also reorient so that their symmetry axes align to the field.The study of dielectric properties concerns storage and dissipation of electric and magnetic energy in materials. Dielectrics are important for explaining various phenomena in electronics, optics, and solid-state physics.