in this paper, we study the electronic properties of a concentric triple quantum ring using exact diagonalization technique. the energy spectra and magnetization for a single electron and two electrons, in the presence of an applied magnetic field, are calculated and discussed. it is shown that, for two-interacting electrons, the period of aharonov-bohm oscillations decreases to the half of tha...

Electron spin qubits in molecular systems offer high reproducibility and the ability to self-assemble into larger architectures. However, interactions between neighboring qubits are "always on," and although the electron spin coherence times can be several hundred microseconds, these are still much shorter than typical times for nuclear spins. Here we implement an electron-nuclear hybrid scheme...

We study Λb → Λπ+π−. The branching fraction is predicted to be about 4.4 ×10−8. Within the standard model, we compute T -odd triple product asymmetries to be about 1.4, 4.3, 6.5 and 7.2% respectively due to ~sΛb,Λ · (~ pΛ × ~ pπ) and ~ pΛ,π · (~sΛ × ~sΛb). PACS number(s): 11.30.Er, 13.30.Eg, 14.20.Mr [email protected] [email protected] 1 In this paper, we consider Λb → Λππ decay and stu...

Site-directed spin labeling (SDSL) in combination with electron paramagnetic resonance (EPR) spectroscopy allows studying the structure, dynamics, and interactions of proteins via distance measurements in the nanometer range. We here give an overview of available spin labels, the strategies for their introduction into proteins, and the associated potentials for protein structural studies in vit...

Dipolar interaction between the magnetic moments of electrons is studied as a source for electron spin decay in quantum dots or arrays of quantum dots. This magnetic interaction will govern spin decay, after other sources, such as the coupling to nuclear spins or spin-orbit coupling, have been eliminated by a suitable sample design. Electron-electron Coulomb interactions, important for magnetic...

We study Λb → Λπ+π−. The branching fraction is predicted to be about 4.38 ×10−6%. Within the standard model, we compute T -odd triple product asymmetries to be about 1.4, 4.3, 6.5 and 7.2% respectively due to ~sΛb(Λ) · (~ pΛ × ~ pπ) and ~ pΛ,π · (~sΛ × ~sΛb). PACS number(s): 11.30.Er, 13.30.Eg, 14.20.Mr [email protected] [email protected] 1 In this paper, we consider Λb → Λππ decay and ...

We present a quantum solution to the electron spin decoherence by a nuclear pair-correlation method for the electron-nuclear spin dynamics under a strong magnetic field and a temperature high for the nuclear spins but low for the electron. The theory incorporates the hyperfine interaction, the intrinsic both direct and indirect nuclear interactions, and the extrinsic nuclear coupling mediated b...

The equilibration of spin temperature Tspin with kinetic temperature T is examined in a weakly correlated pure electron plasma in the strongly magnetized limit, where the distance of closest approach is large compared to the Larmor radius. In this limit, the spin precession frequency ,rZ,===g&./2 is large so the component of spin along the magnetic field is an adiabatic invariant that is broken...

We have studied theoretically the electron spin relaxation in semiconductor quantum dots via interaction with nuclear spins. The relaxation is shown to be determined by three processes: (i) – the precession of the electron spin in the hyperfine field of the frozen fluctuation of the nuclear spins; (ii) – the precession of the nuclear spins in the hyperfine field of the electron; and (iii) – the...

A rapid increase in RNA structural studies has been seen in the past few years, in part due to the interest in the multitude of cellular functions performed by RNA. Electron paramagnetic resonance spectroscopy is a useful technique for studying biopolymer structure under physiologically relevant conditions. We present herein the use of pulsed electron double resonance for the determination of a...