Electronic structure, plane waves and pseudopotentials
... this tolerance, the closer Castep will get to the ground state before finishing – but of course it will take longer. Castep can also compute the forces, and you can set a convergence tolerance on those as well as the energies. For many spectral properties, the forces are a more accurate measure of h ...
... this tolerance, the closer Castep will get to the ground state before finishing – but of course it will take longer. Castep can also compute the forces, and you can set a convergence tolerance on those as well as the energies. For many spectral properties, the forces are a more accurate measure of h ...
CDM article on quantum chaos - Department of Mathematics
... XΓ = Γ\H, where H is the hyperbolic plane and Γ ⊂ P SL(2, R) is a discrete subgroup. Of special interest are the arithmetic quotients when Γ is a discrete arithmetic subgroup. Other model example include Euclidean domains with ergodic billiards such as the Bunimovich stadium. The general question is ...
... XΓ = Γ\H, where H is the hyperbolic plane and Γ ⊂ P SL(2, R) is a discrete subgroup. Of special interest are the arithmetic quotients when Γ is a discrete arithmetic subgroup. Other model example include Euclidean domains with ergodic billiards such as the Bunimovich stadium. The general question is ...
29 Electronic Response to External Perturbations
... Thus Πσσ (q, t − t ) describes the propagation of an electron–hole pair with momentum q and spin σ that is created at time t . It gives the probability of finding this pair at a later time t with the same momentum and spin σ. This propagation can be represented pictorially by the diagram shown i ...
... Thus Πσσ (q, t − t ) describes the propagation of an electron–hole pair with momentum q and spin σ that is created at time t . It gives the probability of finding this pair at a later time t with the same momentum and spin σ. This propagation can be represented pictorially by the diagram shown i ...
Wigner`s Dynamical Transition State Theory in
... the potential energy surface. Certainly for one degree-of-freedom (DoF) Hamiltonian systems (i.e. one configuration space coordinate and one associated momentum) one can understand all possible dynamics from the shape of the potential energy surface. This is definitely not true for more than one DoF ...
... the potential energy surface. Certainly for one degree-of-freedom (DoF) Hamiltonian systems (i.e. one configuration space coordinate and one associated momentum) one can understand all possible dynamics from the shape of the potential energy surface. This is definitely not true for more than one DoF ...
Spin and Charge Fluctuations in Strongly Correlated Systems
... discovered iron-based superconductors), organic Mott insulators and cold atom system in optical lattice. All of the systems share the feature that the Coulomb interaction between electrons is important and it creates strong correlations, which brings interesting phenomenons and challenging questions ...
... discovered iron-based superconductors), organic Mott insulators and cold atom system in optical lattice. All of the systems share the feature that the Coulomb interaction between electrons is important and it creates strong correlations, which brings interesting phenomenons and challenging questions ...
Towards a Tight Finite Key Analysis for BB84
... Fresh from Wikipedia: In quantum mechanics, the Heisenberg uncertainty principle states by precise inequalities that certain pairs of physical properties, such as position and momentum, cannot be simultaneously known to arbitrarily high precision. That is, the more precisely one property can be meas ...
... Fresh from Wikipedia: In quantum mechanics, the Heisenberg uncertainty principle states by precise inequalities that certain pairs of physical properties, such as position and momentum, cannot be simultaneously known to arbitrarily high precision. That is, the more precisely one property can be meas ...
Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits M. D. Shulman
... form the QDs. We operate between the states (0,2) and (1,1) where (n L ,n R ) describes the state with n L (n R ) electrons in the left (right) QD. The |S〉 and |T0 〉 states, the logical subspace for the qubit, are isolated by applying an external magnetic field of B =700mT in the plane of the device ...
... form the QDs. We operate between the states (0,2) and (1,1) where (n L ,n R ) describes the state with n L (n R ) electrons in the left (right) QD. The |S〉 and |T0 〉 states, the logical subspace for the qubit, are isolated by applying an external magnetic field of B =700mT in the plane of the device ...
Dynamics and interference of autoionizing wave packets
... We extend earlier theoretical work on the creation of autoionizing wave packets by a single laser pulse to the case where the autoionizing states are excited by two or more laser pulses. The calculations are performed using R-matrix methods combined with time-dependent multichannel quantum-defect th ...
... We extend earlier theoretical work on the creation of autoionizing wave packets by a single laser pulse to the case where the autoionizing states are excited by two or more laser pulses. The calculations are performed using R-matrix methods combined with time-dependent multichannel quantum-defect th ...
Gate fidelity and coherence of an electron spin in a Si/SiGe quantum
... Next we examine the spin memory time of this electrically controlled spin qubit. In our previous work [7, 12], due to switching between the two valley-orbit states, the Hahn echo decay was exponential with coherence time ≈ 40 µs. Furthermore, we were unable to extend the coherence time using multipl ...
... Next we examine the spin memory time of this electrically controlled spin qubit. In our previous work [7, 12], due to switching between the two valley-orbit states, the Hahn echo decay was exponential with coherence time ≈ 40 µs. Furthermore, we were unable to extend the coherence time using multipl ...
Manifestations of Berry`s phase in molecules and condensed matter
... As in the discrete case outlined above, γ is a gauge-invariant quantity and therefore is potentially observable. The main discovery of Berry’s milestone paper can in fact be spelled out as follows: there exist a whole class of observables which cannot be cast as the expectation values of any operato ...
... As in the discrete case outlined above, γ is a gauge-invariant quantity and therefore is potentially observable. The main discovery of Berry’s milestone paper can in fact be spelled out as follows: there exist a whole class of observables which cannot be cast as the expectation values of any operato ...
Teaching Theoretical Physics: the cases of Enrico Fermi and Ettore
... published [3]; the record book reporting the content of Fermi’s lectures is available as well, kept at the Archives of the University of Rome “La Sapienza.” A strict correspondence can be established between the topics reported in the handbook and those that Fermi actually lectured on in 1927. An ev ...
... published [3]; the record book reporting the content of Fermi’s lectures is available as well, kept at the Archives of the University of Rome “La Sapienza.” A strict correspondence can be established between the topics reported in the handbook and those that Fermi actually lectured on in 1927. An ev ...
Quantum fluctuations in modulated nonlinear oscillators Vittorio Peano and M I Dykman
... emission of excitations in the bath accompanied by transitions between the oscillator energy levels. The transitions lead to relaxation only on average, in fact they happen at random, giving rise to peculiar quantum noise. For a resonantly modulated oscillator, the noise causes diffusion over the os ...
... emission of excitations in the bath accompanied by transitions between the oscillator energy levels. The transitions lead to relaxation only on average, in fact they happen at random, giving rise to peculiar quantum noise. For a resonantly modulated oscillator, the noise causes diffusion over the os ...
PERIMETER INSTITUTE L`INSTITUT PERIMETER
... string theory through its impact on cosmic inflation. Dark energy and the present acceleration of the universe represent one of the greatest puzzles in cosmology today. They provide vital clues as to the ultimate theory and call for a radical reworking of the standard theory of cosmology, Einstein’s ...
... string theory through its impact on cosmic inflation. Dark energy and the present acceleration of the universe represent one of the greatest puzzles in cosmology today. They provide vital clues as to the ultimate theory and call for a radical reworking of the standard theory of cosmology, Einstein’s ...
Hydrogen atom
A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force. Atomic hydrogen constitutes about 75% of the elemental (baryonic) mass of the universe.In everyday life on Earth, isolated hydrogen atoms (usually called ""atomic hydrogen"" or, more precisely, ""monatomic hydrogen"") are extremely rare. Instead, hydrogen tends to combine with other atoms in compounds, or with itself to form ordinary (diatomic) hydrogen gas, H2. ""Atomic hydrogen"" and ""hydrogen atom"" in ordinary English use have overlapping, yet distinct, meanings. For example, a water molecule contains two hydrogen atoms, but does not contain atomic hydrogen (which would refer to isolated hydrogen atoms).