Magnetic-field switchable metal-insulator transitions in a quasihelical conductor Bernd Braunecker, Anders Str¨om,
... to the center of the pseudogap by letting kF = q0 allows conduction only through the modes close to momenta ±2q0 with opposite spins. Through Bx , however, these spins are no longer antiparallel, disorder backscattering becomes again possible, and localization can occur. In this paper we provide a u ...
... to the center of the pseudogap by letting kF = q0 allows conduction only through the modes close to momenta ±2q0 with opposite spins. Through Bx , however, these spins are no longer antiparallel, disorder backscattering becomes again possible, and localization can occur. In this paper we provide a u ...
Magnetic-field-induced resonant tunneling in parallel two
... Our work is related to the resistance resonance ~RR! effect previously found in DQW samples.1 An enhanced longitudinal resistance R l is observed when two electron subbands 1 and 2 in different wells have the same Fermi-wavevector k F ~resonance condition! and their transport scattering times t 1 , ...
... Our work is related to the resistance resonance ~RR! effect previously found in DQW samples.1 An enhanced longitudinal resistance R l is observed when two electron subbands 1 and 2 in different wells have the same Fermi-wavevector k F ~resonance condition! and their transport scattering times t 1 , ...
Particle Physics in Austria
... Institute of Fundamental Interactions The new Institute will be created through the joining of HEPHY and SMI • Four major research lines will be pursued - Accelerator-based particle physics with CMS at LHC and Belle II at KEKB - Physics of non-perturbative QCD (exotic nuclear matter) at DAΦNE, JPARC ...
... Institute of Fundamental Interactions The new Institute will be created through the joining of HEPHY and SMI • Four major research lines will be pursued - Accelerator-based particle physics with CMS at LHC and Belle II at KEKB - Physics of non-perturbative QCD (exotic nuclear matter) at DAΦNE, JPARC ...
Gaining Momentum
... •There are two types of collisions: inelastic and elastic. Linear momentum is conserved in BOTH. •An “elastic” collision is one in which the objects “bounce”, and energy is conserved. •An “inelastic” collision is one in which the objects stick together, and energy is lost to heat. ...
... •There are two types of collisions: inelastic and elastic. Linear momentum is conserved in BOTH. •An “elastic” collision is one in which the objects “bounce”, and energy is conserved. •An “inelastic” collision is one in which the objects stick together, and energy is lost to heat. ...
MASSACHUSETTS INSTITUTE OF TECHNOLOGY
... assumed massless); string B pulls down on the pulley on each side with a force, TP ,B , which has magnitude TB . String A holds the pulley up with a force TP , A with the magnitude TA equal to the tension in string A . The free body diagram for the forces acting on the moving pulley are shown below. ...
... assumed massless); string B pulls down on the pulley on each side with a force, TP ,B , which has magnitude TB . String A holds the pulley up with a force TP , A with the magnitude TA equal to the tension in string A . The free body diagram for the forces acting on the moving pulley are shown below. ...
Rigorous Approach to Bose-Einstein Condensation
... is sufficiently dilute, imposing a constraint on its density. Every interaction can be effectively described by a limited number of parameters. Under strong dilution, it turns out that the only effective parameter entering the theory is the so-called ‘s-wave scattering length’ which, roughly speakin ...
... is sufficiently dilute, imposing a constraint on its density. Every interaction can be effectively described by a limited number of parameters. Under strong dilution, it turns out that the only effective parameter entering the theory is the so-called ‘s-wave scattering length’ which, roughly speakin ...
Document
... and postselect in (X - Y) + B, you know the particle was in B. But this is the same as preparing (B + Y) + X and postselecting (B - Y) + X, which means you also know the particle was in X. If P(B) = 1 and P(X) = 1, where was the particle really? But back up: is there any physical sense in which this ...
... and postselect in (X - Y) + B, you know the particle was in B. But this is the same as preparing (B + Y) + X and postselecting (B - Y) + X, which means you also know the particle was in X. If P(B) = 1 and P(X) = 1, where was the particle really? But back up: is there any physical sense in which this ...
On The Copenhagen Interpretation of Quantum Mechanics
... procedures might involve rulers, scales, springs, and electrical circuits. At the microscopic scale, think of Geiger counters, or photodetectors that “click” in response to radiation. All direct knowledge of microscopic stuff comes from such devices. Already you can see a problem emerging from this ...
... procedures might involve rulers, scales, springs, and electrical circuits. At the microscopic scale, think of Geiger counters, or photodetectors that “click” in response to radiation. All direct knowledge of microscopic stuff comes from such devices. Already you can see a problem emerging from this ...
Chapter 8 Path Integrals in Statistical Mechanics
... For low temperature β → ∞ the spectral sum (8.7) is dominated by the contribution of lowest energy such that the free energy will tend to the ground state energy, ...
... For low temperature β → ∞ the spectral sum (8.7) is dominated by the contribution of lowest energy such that the free energy will tend to the ground state energy, ...
Renormalization group
In theoretical physics, the renormalization group (RG) refers to a mathematical apparatus that allows systematic investigation of the changes of a physical system as viewed at different distance scales. In particle physics, it reflects the changes in the underlying force laws (codified in a quantum field theory) as the energy scale at which physical processes occur varies, energy/momentum and resolution distance scales being effectively conjugate under the uncertainty principle (cf. Compton wavelength).A change in scale is called a ""scale transformation"". The renormalization group is intimately related to ""scale invariance"" and ""conformal invariance"", symmetries in which a system appears the same at all scales (so-called self-similarity). (However, note that scale transformations are included in conformal transformations, in general: the latter including additional symmetry generators associated with special conformal transformations.)As the scale varies, it is as if one is changing the magnifying power of a notional microscope viewing the system. In so-called renormalizable theories, the system at one scale will generally be seen to consist of self-similar copies of itself when viewed at a smaller scale, with different parameters describing the components of the system. The components, or fundamental variables, may relate to atoms, elementary particles, atomic spins, etc. The parameters of the theory typically describe the interactions of the components. These may be variable ""couplings"" which measure the strength of various forces, or mass parameters themselves. The components themselves may appear to be composed of more of the self-same components as one goes to shorter distances.For example, in quantum electrodynamics (QED), an electron appears to be composed of electrons, positrons (anti-electrons) and photons, as one views it at higher resolution, at very short distances. The electron at such short distances has a slightly different electric charge than does the ""dressed electron"" seen at large distances, and this change, or ""running,"" in the value of the electric charge is determined by the renormalization group equation.