A5028042782- Quantum and electron transport phenomena
- Quantum chaos and dynamical systems
- Cosmology and Gravitation Theories
- Quantum, superfluid, helium dynamics
- Geophysics and Gravity Measurements
- Theoretical and Computational Physics
- Cold Atom Physics and Bose-Einstein Condensates
- Magnetism in coordination complexes
- Quantum Mechanics and Non-Hermitian Physics
- Advanced Chemical Physics Studies
- Black Holes and Theoretical Physics
- Quantum Electrodynamics and Casimir Effect
- Advanced Condensed Matter Physics
- Quantum many-body systems
- Semiconductor Quantum Structures and Devices
- Magnetic Properties and Synthesis of Ferrites
- Advanced Thermodynamics and Statistical Mechanics
- Spectroscopy and Quantum Chemical Studies
- Multiferroics and related materials
- Aesthetic Perception and Analysis
- Solar and Space Plasma Dynamics
- Metal complexes synthesis and properties
- Gyrotron and Vacuum Electronics Research
- Chemical Thermodynamics and Molecular Structure
- Quantum Dots Synthesis And Properties
Case Western Reserve University
2013-2024
University of California, Santa Cruz
2021
D.Y. Patil University
2021
University of California, Santa Barbara
1997
AT&T (United States)
1994-1996
Yale University
1991-1992
National Chemical Laboratory
1964-1978
This article reviews Lectures on Quantum Mechanics. by Steven Weinberg 377 pp. , New York, 2012. Price $89.99 (hardcover). ISBN 978-1-107-02872-2.
We summarize the utility of precise cosmic microwave background (CMB) polarization measurements as probes physics inflation. focus on prospects for using CMB to differentiate various inflationary mechanisms. In particular, a detection primordial B‐mode would demonstrate that inflation occurred at very high energy scale, and inflaton traversed super‐Planckian distance in field space. explain how such or constraint illuminate aspects Planck scale. Moreover, can constrain scale‐dependence...
We show that the effects of spin-orbit interaction in disordered conductors are manifestations Aharonov-Casher effect same sense as weak magnetic fields Aharonov-Bohm effect. propose that, semiconducting samples, conductance oscillations should occur due to effect, whose observation would constitute a thousandfold improvement its measurement. As these have half period expected from conventional
In a remarkable development Bender and coworkers have shown that it is possible to formulate quantum mechanics consistently even if the Hamiltonian other observables are not Hermitian. Their formulation, dubbed PT mechanics, replaces hermiticity by another set of requirements, notably should be invariant under discrete symmetry PT, where P denotes parity T time reversal. All prior work has focused on case reversal (T^2 = 1). We generalize formalism odd -1). discover an analogue Kramer's...
The spin-orbit interaction is shown to arise as a Berry phase term in the adiabatic effective Hamiltonian for orbital motion of Dirac electron. This approach makes explicit intimate connection and Thomas precession.
Using a large $N$ sigma model approximation we explicitly calculate the power spectrum of gravitational waves arising from global phase transition in early Universe and confirm that it is scale invariant, implying an observation such may not be unique feature inflation. Moreover, predicted amplitude can over 3 orders magnitude larger than naive dimensional estimate, even occurs after inflation dominate cosmic microwave background polarization or other gravity wave signals.
We develop relativistic wave equations in the framework of new non-Hermitian $\mathcal{P}\mathcal{T}$ quantum mechanics. The familiar Hermitian Dirac equation emerges as an exact result imposing algebra, criteria $\mathcal{P}\mathcal{T}$-symmetric mechanics, and invariance. However, relaxing constraint that, particular, mass matrix be also allows for models that have no counterpart conventional For example it is well known a quartet Weyl spinors coupled by reduces to two independent...
The persistent currents in arrays of isolated mesoscopic metallic rings are shown by conventional diagrammatic analysis (within a noninteracting model) to retain their paramagnetic character even the presence strong spin-orbit interaction. It is that this result consistent with nonperturbative one-dimensional results Meir et al., if these correctly applied canonical ensemble.
The Mössbauer spectrum of FeAl2O4 consists three absorption peaks at 0, 1.46 and 2.56 mm s-1 relative to a 57Co/Cu source. can be resolved into two quadrupole-split spectra. outer pair lines corresponds quadrupole splitting 2.76±0.10 an isomer shift 1.52±0.10 may attributed the Fe2+ ions B sites. inner doublet with 1.39±0.10 1.10±0.10 A degree inversion x was determined from areas under spectra 23±2%. This is in agreement value 25% intensities X-ray diffraction powder pattern.
Abstract A new class of Kuiper Belt objects (KBOs) that lie beyond Neptune with semimajor axes greater than 250 astronomical units show orbital anomalies have been interpreted as evidence for an undiscovered ninth planet. We a modified gravity theory known Newtonian dynamics (MOND) provides alternative explanation the using well-established secular approximation. predict major orbits will be aligned direction toward Galactic center and cluster in phase space, agreement observations KBOs from...
A bstract Yangian-type differential operators are shown to constrain Feynman integrals beyond the restriction integrable graphs. In particular, we prove that all position-space diagrams at tree level feature a Yangian level-one momentum symmetry as long their external coordinates distinct. This is traced back set of more elementary bilocal operators, which annihilate integrals. dual space, considered graphs represent multi-loop without ‘loops loops’, generalizing for instance family...
The discovery of a distinct transition from integrable to chaotic electron dynamics results resonant tunneling spectroscopy quantum well in tilted magnetic field. spectra show peak doubling regions at small tilt angles, which give way tripling larger angles. chaos is mapped systematically (by varying bias voltage, field, angle, and the width well). We find that (tripling) bifurcation (trifurcation) dominant stable periodic orbit. These are precursors transition.
The effect of silicon-oxide interface roughness on the weak-localization magnetoconductance a silicon metal-oxide-semiconductor field-effect transistor in magnetic field, tilted with respect to interface, is studied. It shown that an electron picks up random Berry's phase as it traverses closed orbit. Effectively, due roughness, sees uniform field parallel perpendicular field. At zero dependence conductance has well-known form, line shape. Here applying fixed shape analyzed. Many types...
The damping of quantum effects in the transport properties electrons deposited on a surface liquid helium is studied. It found that due to vertical motion vapor atoms, interference paths duration t damped by factor $\mathrm{exp}\ensuremath{-}(t/{\ensuremath{\tau}}_{v}{)}^{3}.$ An expression derived for weak-localization line shape case which occurs combination processes with this type cubic exponential and simple factor.
It has been claimed that fractal analysis can be applied to unambiguously characterize works of art such as the drip paintings Jackson Pollock. This academic issue become more general interest following recent discovery a cache disputed Pollock paintings. We definitively demonstrate here, by analyzing and others, criteria provide no information about artistic authenticity. work led us result in scientific significance: we show statistics ``covering staircase'' (closely related box-counting...
(1969). Electric field gradients in normal spinels. Molecular Physics: Vol. 16, No. 6, pp. 625-626.
Transport measurements on gated GaAs/Al${}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}$ heterostructures over a wide range of electron densities are reported. Experimental observations the crossover from weak to strong localization compared with theoretical predictions. Agreement is found between lengths obtained hopping transport at low density and scaling theory estimate classical Drude conductivity high density.