Electron spin dynamics and electron spin resonance in graphene

A theory of spin relaxation in graphene including intrinsic, Bychkov-Rashba, and ripple spin-orbit coupling is presented. We find from spin relaxation data by Tombros et al. [Nature 448, 571 (2007).] that intrinsic spin-orbit coupling dominates over other contributions with a coupling constant of 3.7 meV. Although it is 1-3 orders of magnitude larger than those obtained from first principles, we show that comparable values are found for other honeycomb systems, MgB2 and LiC6; the latter is studied herein by electron spin resonance (ESR). We predict that spin coherence is longer preserved for spins perpendicular to the graphene plane, which is beneficial for spintronics. We identify experimental conditions when bulk ESR is realizable on graphene

Ralph Waldo Emerson as a critic of literature

Thesis (M.A.)--University of Kansas, English, 1929

New World of Gossamer Superconductivity

Since the discovery of the high-T$_{c}$ cuprate superconductor La$_{2-x}$BaCuO$_{4}$ in 1986 by Bednorz and M\"{u}ller, controversy regarding the nature or origin of this remarkable superconductivity has continued. However, d-wave superconductivity in the hole-doped cuprates, arising due to the anti-paramagnon exchange, was established around 1994. More recently we have shown that the mean field theory, like the BCS theory of superconductivity and Landau's Fermi liquid theory are adequate to describe the cuprates. The keys for this development are the facts that a)the pseudogap phase is d-wave density wave (dDW) and that the high-T$_{c}$ cuprate superconductivity is gossamer (i.e. it exists in the presence of dDW).Comment: 6 pages, 4 figure

Filosofia 6/18: petita història d'un projecte per ensenyar el valor de pensar

Abstract not availabl

Through What Mechanisms Does Business Analytics Contribute To Business Value?

This paper synthesizes from the literature a model of factors affecting organizational benefits from business analytics, then reports a preliminary test of that model. The model consists of two parts: a process model and a variance model. The process model depicts the analyse-insight-decision-action process through which an organization’s business-analytic capabilities (high-quality data, integrated BA platform, and analytic people) create business value. The variance model proposes that the five factors in Davenport et al.’s (2010) DELTA model of BA success factors, plus three from Seddon et al.’s (2010) model of factors affecting organizational benefits from enterprise systems, assist a firm to embed evidence-based decision making in the organization, and so contribute to business value. A preliminary test of the model was conducted using data from 40 customer-success stories from IBM, SAP and Teradata websites. Our conclusion was that the model is likely to be a useful basis for future research

Optimal protocols for quantum quenches of finite duration in the Luttinger model

Reaching a target quantum state from an initial state within a finite temporal window is a challenging problem due to nonadiabaticity. We study the optimal protocol for switching on interactions to reach the ground state of a weakly interacting Luttinger liquid within a finite time tau, starting from the noninteracting ground state. The protocol is optimized by minimizing the excess energy at the end of the quench, or by maximizing the overlap with the interacting ground state. We find that the optimal protocol is symmetric with respect to tau/2, and can be expressed as a functional of the occupation numbers of the bosonic modes in the final state. For short quench durations, the optimal protocol exhibits fast oscillation and excites high-energy modes. In the limit of large tau, minimizing energy requires a smooth protocol while maximizing overlap requires a linear quench protocol. In this limit, the minimal energy and maximal overlap are both universal functions of the system size and the duration of the protocol

Aspects of unconventional density waves

Recently many people discuss unconventional density waves (i.e. unconventional charge density waves (UCDW) and unconventional spin density waves (USDW)). Unlike in conventional density waves, the quasiparticle spectrum in these systems is gapless. Also these systems remain metallic. Indeed it appears that there are many candidates for UDW. The low temperature phase of alpha-(BEDT-TTF)_2KHg(SCN)_4, the antiferromagnetic phase in URu_2Si_2, the CDW in transition metal dichalcogenite NbSe_2, the pseudogap phase in high T_c cuprate superconductors, the glassy phase in organic superconductor kappa-(BEDT-TTF)_2Cu[N(CN)_2]Br. After a brief introduction on UCDW and USDW, we shall discuss some of the above systems, where we believe we have evidence for unconventional density waves.Comment: 11 pages, 5 figure

Generalized Gibbs ensemble and work statistics of a quenched Luttinger liquid

We analyze the probability distribution function (PDF) of work done on a Luttinger liquid for an arbitrary finite duration interaction quench and show that it can be described in terms of a generalized Gibbs ensemble. We construct the corresponding density matrix with explicit intermode correlations, and determine the duration and interaction dependence of the probability of an adiabatic transition and the PDF of nonadiabatic processes. In the thermodynamic limit, the PDF of work exhibits a non-Gaussian maximum around the excess heat, carrying almost all the spectral weight. In contrast, in the small system limit most spectral weight is carried by a delta peak at the energy of the adiabatic process, and an oscillating PDF with dips at energies commensurate to the quench duration and with an exponential envelope develops. Relevance to cold atom experiments is also discussed

Financial Reporting Impact Of The Operating Lease Classification

The Financial Accounting Standards Board (FASB) and the International Accounting Standards Board (IASB) are preparing to make changes to accounting standards for leasing that will have a significant impact on the financial statements of a large number of companies. The proposed standard will eliminate the operating lease classification, and if passed, companies using this classification will be required to report additional assets and liabilities on the balance sheet. This study estimates the impact of this change in accounting standards on the financial statements and several key financial ratios for an extensive sample of companies and industries from the Compustat North America database. It is important that users of financial statements understand and are prepared for these changes prior to implementation, particularly for industries in which operating leases are heavily utilized