First Principles Calculations of Off-Normal LEEM
... Our method: Find self-consistent potential and scattering states with DFT packages for solids Introduce a supercell Match incoming and outgoing plane waves to Bloch solutions at interfaces Quantum ESPRESSO (plane wave basis) Specular reflection only; lowest energy range Focus on Free-Standing Gr ...
... Our method: Find self-consistent potential and scattering states with DFT packages for solids Introduce a supercell Match incoming and outgoing plane waves to Bloch solutions at interfaces Quantum ESPRESSO (plane wave basis) Specular reflection only; lowest energy range Focus on Free-Standing Gr ...
Is Quantum Chemistry a Degenerating Research Programme?
... neglect is not universal. Quantum chemists are well aware that relativistic effects do have a bearing on their predictions of molecular energies and properties. There is a significant and fruitful research effort to quantify relativistic effects. The issue here is that relativistic effects can gener ...
... neglect is not universal. Quantum chemists are well aware that relativistic effects do have a bearing on their predictions of molecular energies and properties. There is a significant and fruitful research effort to quantify relativistic effects. The issue here is that relativistic effects can gener ...
Interpreting Spontaneous Collapse Theories - Philsci
... wave that is localized within a small volume of space. However, according to the Schrödinger equation, such a wave will rapidly spread out over the whole of space. The difficulty here is that our observations of particles and of the objects made up of them reveal them to be well localized in space, ...
... wave that is localized within a small volume of space. However, according to the Schrödinger equation, such a wave will rapidly spread out over the whole of space. The difficulty here is that our observations of particles and of the objects made up of them reveal them to be well localized in space, ...
Hybrid discrete- and continuous
... Many physical platforms, including photons, ions, atoms, solid state and superconducting devices and nuclear magnetic resonance [1], are being explored in the view of constructing a quantum computer. But, irrespective of the physical implementation, quantum information processing (QIP) comes in two ...
... Many physical platforms, including photons, ions, atoms, solid state and superconducting devices and nuclear magnetic resonance [1], are being explored in the view of constructing a quantum computer. But, irrespective of the physical implementation, quantum information processing (QIP) comes in two ...
New constructions for Quantum Money
... bank has to maintain a temporary session memory. Moreover, we have made the proof more modular and conceptually simpler by introducing a new cryptographic primitive as tool for the security analysis. Second, we create a public-key quantum money scheme from one-time memories in the random oracle mode ...
... bank has to maintain a temporary session memory. Moreover, we have made the proof more modular and conceptually simpler by introducing a new cryptographic primitive as tool for the security analysis. Second, we create a public-key quantum money scheme from one-time memories in the random oracle mode ...
Physical Limits of Computing
... the state count by e). A bit, meanwhile, corresponds to a requirement of 9.57 10-24 Joules per degree Kelvin, the energy needed to double the state count. Now, that's infropy, but what distinguishes physical entropy from physical information? The distinction is fundamentally observer-dependent, bu ...
... the state count by e). A bit, meanwhile, corresponds to a requirement of 9.57 10-24 Joules per degree Kelvin, the energy needed to double the state count. Now, that's infropy, but what distinguishes physical entropy from physical information? The distinction is fundamentally observer-dependent, bu ...
Current State of Quantum Computing
... difficulties that are currently associated with quantum computing, a company called DWave Systems plans to have a working quantum computer in three years [15]. The computer will not be fully functional quantum compuer but will be able to solve problems like the traveling-salesman problem in reasonab ...
... difficulties that are currently associated with quantum computing, a company called DWave Systems plans to have a working quantum computer in three years [15]. The computer will not be fully functional quantum compuer but will be able to solve problems like the traveling-salesman problem in reasonab ...
Particles and Fields
... where the radius a of the electron cloud is taken to be 0.5 Å. The forces which keep the protons and neutrons bound in the nucleus are very different from and much stronger than the Coulomb forces acting between electric charges. Indeed, neutrons have no charge, and therefore no Coulomb field. Neve ...
... where the radius a of the electron cloud is taken to be 0.5 Å. The forces which keep the protons and neutrons bound in the nucleus are very different from and much stronger than the Coulomb forces acting between electric charges. Indeed, neutrons have no charge, and therefore no Coulomb field. Neve ...
Particle in a box
In quantum mechanics, the particle in a box model (also known as the infinite potential well or the infinite square well) describes a particle free to move in a small space surrounded by impenetrable barriers. The model is mainly used as a hypothetical example to illustrate the differences between classical and quantum systems. In classical systems, for example a ball trapped inside a large box, the particle can move at any speed within the box and it is no more likely to be found at one position than another. However, when the well becomes very narrow (on the scale of a few nanometers), quantum effects become important. The particle may only occupy certain positive energy levels. Likewise, it can never have zero energy, meaning that the particle can never ""sit still"". Additionally, it is more likely to be found at certain positions than at others, depending on its energy level. The particle may never be detected at certain positions, known as spatial nodes.The particle in a box model provides one of the very few problems in quantum mechanics which can be solved analytically, without approximations. This means that the observable properties of the particle (such as its energy and position) are related to the mass of the particle and the width of the well by simple mathematical expressions. Due to its simplicity, the model allows insight into quantum effects without the need for complicated mathematics. It is one of the first quantum mechanics problems taught in undergraduate physics courses, and it is commonly used as an approximation for more complicated quantum systems.