共查询到20条相似文献,搜索用时 15 毫秒
1.
G. S. Kliros 《Il Nuovo Cimento D》1991,13(1):111-120
Summary The ground-state energy of two-dimensional interacting electrons in a strong magnetic field in the angular-momentum representation
is studied using a modified Lanczos diagnonalization method. In the presence of a positive background density the ground-state
energy increases with the total angular momentum, while a cusp-type behaviour appears. The problem of the electron-impurities
interaction is formulated as well. The results are discussed in connection with the observed fractional quantum Hall states.
Due to the relevance of its scientific content, this paper has been given priority by the Journal Direction.
The author of this paper has agreed to not receive the proofs for correction. 相似文献
2.
J. Gasser M.A. Ivanov E. Lipartia M. Mojzis A. Rusetsky 《The European Physical Journal C - Particles and Fields》2002,26(1):13-34
We investigate the ground-state energy of the atom (pionic hydrogen) in the framework of QCD + QED. In particular, we evaluate the strong energy-level shift. We perform
the calculation at next-to-leading order in the low-energy expansion in the framework of the relevant effective field theory.
The result provides a relation between the strong energy shift and the pion-nucleon S-wave scattering lengths - evaluated in pure QCD - at next-to-leading order in isospin-breaking and in the low-energy expansion.
We compare our result with available model calculations.
Received: 11 June 2002 / Published online: 9 October 2002 相似文献
3.
Vassilios Fessatidis Frank A. CorvinoJay D. Mancini William J. MassanoSamuel P. Bowen 《Physics letters. A》2012,376(4):573-578
The coupling of a two-level system to quantized boson modes has been the focus of many researchers for a number of years. Applications to exciton motion, molecular polaron formation, chaos in quantum systems as well as a number of other effects in condensed matter physics have also been studied. Here we investigate the interaction of bosonic modes with a two-level fermionic system. This quantum system is used as a testing ground for a recently developed Generalized Moments Expansion, GMX(m,n), of which the well-known Connected Moments Expansion (CMX) and Alternate Moments Expansion (AMX) are special cases. The convergence and viability of this scheme are discussed and comparisons are made with a related Canonical Sequence Method (CSM) as well as a Lanczos tridiagonal truncation scheme. 相似文献
4.
R. Ahlrichs O. Dumbrajs H. Pilkuhn H. G. Schlaile 《Zeitschrift für Physik A Hadrons and Nuclei》1982,306(4):297-300
High rotational states of¯p He and¯pLi atoms with one or two electrons are calculated in the Born-Oppenheimer approximation, with a precision which allows a systematic study of diabatic effects. The lifetimes of the relevant¯peα and¯pee Li states are in the μs range. 相似文献
5.
P. Farkašovský 《The European Physical Journal B - Condensed Matter and Complex Systems》2001,20(2):209-215
A new numerical method is used to study the ground-state properties of the spinless Falicov-Kimball model in one and two dimensions.
The resultant solutions are used to examine the phase diagram of the model as well as possibilities for valence and metal-insulator
transitions. In one dimension a comprehensive phase diagram of the model is presented. On the base of this phase diagram,
the complete picture of valence and metal-insulator transitions is discussed. In two dimensions the structure of ground-state
configurations is described for intermediate interactions between f and d electrons. In this region the phase separation and metal-insulator transitions are found at low f-electron concentrations. It is shown that valence transitions exhibit a staircase structure.
Received 20 October 2000 相似文献
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The kinetic (K 4 0 (n) and K 3 0 (n)) and potential (V 4 0 (n) and V 3 0 (n)) energies of 4He and 3He atoms have been found from the law of corresponding states and the experimental data on the dependence of the ground-state energies E 4 0 (n) and E 3 0 (n) on the density of the isotopes 4He and 3He. In the approximation of structureless quantum liquid, the potential energies are equal, V 4 0 V 3 0 (n) = (n), and the kinetic energies are inversely proportional to the atomic mass, $K_4^0 (n) = \frac{3} {4}K_3^0 (n)$ . The potential energy given by the expression V 0 = 4E 4 0 ? 3E 3 0 to a high accuracy is linear in the density n, which is associated with nearly an absence of short-range order in liquid helium. The kinetic energy of liquid 4He is given by the expression K 4 0 = 3(E 3 0 ? E 4 0 ), which agrees with the experimental data on neutron scattering in liquid 4He. The quantities K 4 0 (n) and K 3 0 (n) determine the scale of all thermodynamic characteristics in the temperature range where the effects of the particle statistics can be neglected. 相似文献
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We present a perturbation study of the ground-state energy of the beryllium atom by incorporating double parameters in the atom's Hamiltonian. The eigenvalue of the Hamiltonian is then solved with a double-fold perturbation scheme,where the spin-spin interaction of electrons from different shells of the atom is also considered. Calculations show that the obtained ground-state energy is in satisfactory agreement with experiment. It is found that the Coulomb repulsion of the inner-shell electrons enhances the effective nuclear charge seen by the outer-shell electrons, and the shielding effect of the outer-shell electrons to the nucleus is also notable compared with that of the inner-shell electrons. 相似文献
12.
C. E. I. Carneiro M. J. de Oliveira W. F. Wreszinski 《Journal of statistical physics》1995,79(1-2):347-376
We show rigorously that the ground state of a quantum chain with competing ferromagnetic nearest and antiferromagnetic next nearest interactions undergoes a transition from ferromagnetic to helical type, in the isotropic case, for a certain value of the relevant ratio of coupling constants. Boundaries of the phase diagram are also determined in the anisotropic case. The stability of a special quantum state (corresponding to a classical modulated phase of =/3) is analyzed by an extension of Holstein-Primakoff arguments, along a line of constant ratio of couplings, showing in particular a sequence of (instability) gaps. Finally, a natural adaptation of a variational wave function due to Huse and Elser is used to study several portions of the phase diagram, with very good agreement with previous theoretical results. 相似文献
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非典型耦合下二价原子能级的精细结构 总被引:1,自引:1,他引:0
在典型耦合理论基础上,给出了在非典型耦合下计算二价原子精细结构能级的理论公式,并将理论应用到若干具体问题,结果与实验数据相符,且直观地显示出典型耦合只是非典型耦合的特例。 相似文献
15.
The dissociation energy of twelve diatomic molecules has been determined by fitting four-parameter potential functionU(r)=D
e[[1−exp{−b(r−r
e)}]/ [1−Cexp{−b(r−r
e)}]]2 to the true Rydberg-Klein-Rees (RKR) curves for their fifteen electronic states using the mean square deviation as the criterion
for the selection of the best fit. Average deviation ofD
e has been found to be 2.7% as compared to 20.5% obtained with Lippincott’s potential function for these molecules. In addition
the anharmonocity constantω
exe has also been calculated for the same electronic states yielding average mean deviation 8.9%. 相似文献
16.
T.V. Ramakrishna Rao R.Ramakrishna Reddy 《Journal of Quantitative Spectroscopy & Radiative Transfer》1981,25(3):295-298
We propose a modified potential energy function that is as easily used as the Hulburt-Hirschfelder (H-H) function. Dissociation energies have been estimated for MgO, CaO, and SrO and other molecules. 相似文献
17.
R. Asgari 《Solid State Communications》2007,141(10):563-568
We present a theory of the pair distribution function g(z) and many-body effective electron-electron interaction for the one dimensional (1D) electron liquid. Our approach involves the solution of a zero-energy scattering Schrödinger equation for where we implemented the Fermi hypernetted-chain approximation including the elementary diagram corrections. We present numerical results for g(z) and the static structure factor S(k) and obtain good agreement with data from diffusion Monte Carlo studies of the 1D system. We calculate the correlation energy and charge excitation spectrum over an extensive range of electron density. Furthermore, we obtain the static correlations in good qualitative agreement with those calculated for the Luttinger liquid model with long-range interactions. 相似文献
18.
L. Cândido T. L. Fonseca J. N. Teixeira Rabelo G. -Q. Hai 《The European Physical Journal B - Condensed Matter and Complex Systems》2008,64(1):81-86
We study the ground-state energy of a classical artificial molecule formed by two-dimensional clusters (artificial atoms)
of N/2 charged particles separated by a distance d. For the small molecules of N = 2 and 4, we obtain analytical expressions for this energy. For the larger ones, we calculate the ground-state energy using
molecular dynamics simulation for N up to 128. From our numerical results, we are able to find out a function to approximate the ground-state energy of the molecules
covering the range from atoms to molecules for any inter-atom distance d and for particle number from N = 8 to 128 within a difference less than one percent from the MD data. 相似文献
19.
We calculate the ground-state energy of strongly correlated electrons by using a twodimensional (CuO2)N system as an example. It constitutes the most important structural element of the high-T
c superconducting materials. The strong correlations are treated by projection technique. For that purpose a new form of the free energy is derived, which allows for applying that method. The ground-state energy for the half-filled band case is calculated by using a Padé approximation which agrees with series expansions up to order (t/(
p
–
d
))6. Heret is thep-d hopping matrix element and
p
,
d
are the orbital energies of the O(2p
x(y)) and
electrons. 相似文献
20.
Minor WR 《Physical review. B, Condensed matter》1993,47(19):12716-12721