The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
John Goold - One of the best experts on this subject based on the ideXlab platform.
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pinning quantum phase transition in a tonks girardeau gas diagnostics by ground state fidelity and the loschmidt echo
Physical Review A, 2012Co-Authors: K Lelas, T Seva, Hrvoje Buljan, John GooldAbstract:We study the pinning quantum phase transition in a Tonks-Girardeau gas, both in equilibrium and out of equilibrium, using the ground-state fidelity and the Loschmidt echo as diagnostic tools. The ground-state fidelity will have a dramatic decrease when the atomic density approaches the commensurate density of one particle per Lattice well. This decrease is a signature of the pinning transition from the Tonks to the Mott insulating phase. We study the applicability of the fidelity for diagnosing the pinning transition in experimentally realistic scenarios. We find that fidelity can predict the particle number(s) at which the pinning occurs. In addition, we explore the out-of-equilibrium dynamics of the gas following a sudden quench with a Lattice Potential. We find that all properties of the ground-state fidelity are reflected in the Loschmidt echo dynamics, i.e., in the nonequilibrium dynamics of the Tonks-Girardeau gas initiated by a sudden quench of the Lattice Potential.
I. Bloch - One of the best experts on this subject based on the ideXlab platform.
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Tonks-Girardeau gas of ultracold atoms in an optical Lattice
Nature, 2004Co-Authors: B. Paredes, A. Widera, V. Murg, O. Mandel, S. Folling, I. Cirac, G.v. Shlyapnikov, T.w. Hansch, I. BlochAbstract:Strongly correlated quantum systems are among the most intriguing and fundamental systems in physics. One such example is the Tonks−Girardeau gas1, 2, proposed about 40 years ago, but until now lacking experimental realization; in such a gas, the repulsive interactions between bosonic particles confined to one dimension dominate the physics of the system. In order to minimize their mutual repulsion, the bosons are prevented from occupying the same position in space. This mimics the Pauli exclusion principle for fermions, causing the bosonic particles to exhibit fermionic properties1, 2. However, such bosons do not exhibit completely ideal fermionic (or bosonic) quantum behaviour; for example, this is reflected in their characteristic momentum distribution3. Here we report the preparation of a Tonks−Girardeau gas of ultracold rubidium atoms held in a two-dimensional optical Lattice formed by two orthogonal standing waves. The addition of a third, shallower Lattice Potential along the long axis of the quantum gases allows us to enter the Tonks−Girardeau regime by increasing the atoms' effective mass and thereby enhancing the role of interactions. We make a theoretical prediction of the momentum distribution based on an approach in which trapped bosons acquire fermionic properties, finding that it agrees closely with the measured distribution.
Leslie Glasser - One of the best experts on this subject based on the ideXlab platform.
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Lattice Potential energy estimation for complex ionic salts from density measurements
Inorganic Chemistry, 2002Co-Authors: Donald Brooke H Jenkins, David Tudela, Leslie GlasserAbstract:This paper is one of a series exploring simple approaches for the estimation of Lattice energy of ionic materials, avoiding elaborate computation. The readily accessible, frequently reported, and easily measurable (requiring only small quantities of inorganic material) property of density, rho(m), is related, as a rectilinear function of the form (rho(m)/M(m))(1/3), to the Lattice energy U(POT) of ionic materials, where M(m) is the chemical formula mass. Dependence on the cube root is particularly advantageous because this considerably lowers the effects of any experimental errors in the density measurement used. The relationship that is developed arises from the dependence (previously reported in Jenkins, H. D. B.; Roobottom, H. K.; Passmore, J.; Glasser, L. Inorg. Chem. 1999, 38, 3609) of Lattice energy on the inverse cube root of the molar volume. These latest equations have the form U(POT)/kJ mol(-1) = gamma(rho(m)/M(m))(1/3) + delta, where for the simpler salts (i.e., U(POT)/kJ mol(-1) 5000, gamma/kJ mol(-1) cm = 10(-7) AI(2IN(A))(1/3) and delta/kJ mol(-1) = 0 where A is the general electrostatic conversion factor (A = 121.4 kJ mol(-1)), I is the ionic strength = 1/2 the sum of n(i)z(i)(2), and N(A) is Avogadro's constant.
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Lattice Potential energy estimation for complex ionic salts from density measurements
Inorganic Chemistry, 2002Co-Authors: Donald Brooke H Jenkins, David Tudela, Leslie GlasserAbstract:This paper is one of a series exploring simple approaches for the estimation of Lattice energy of ionic materials, avoiding elaborate computation. The readily accessible, frequently reported, and easily measurable (requiring only small quantities of inorganic material) property of density, ρm, is related, as a rectilinear function of the form (ρm/Mm)1/3, to the Lattice energy UPOT of ionic materials, where Mm is the chemical formula mass. Dependence on the cube root is particularly advantageous because this considerably lowers the effects of any experimental errors in the density measurement used. The relationship that is developed arises from the dependence (previously reported in Jenkins, H. D. B.; Roobottom, H. K.; Passmore, J.; Glasser, L. Inorg. Chem. 1999, 38, 3609) of Lattice energy on the inverse cube root of the molar volume. These latest equations have the form UPOT/kJ mol-1 = γ(ρm/Mm)1/3 + δ, where for the simpler salts (i.e., UPOT/kJ mol-1 < 5000 kJ mol-1), γ and δ are coefficients dependent u...
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relationships among ionic Lattice energies molecular formula unit volumes and thermochemical radii
Inorganic Chemistry, 1999Co-Authors: H Jenkins, Helen K Roobottom, J Passmore, Leslie GlasserAbstract:The linear generalized equation described in this paper provides a further dimension to the prediction of Lattice Potential energies/enthalpies of ionic solids. First, it offers an alternative (and often more direct) approach to the well-established Kapustinskii equation (whose capabilities have also recently been extended by our recent provision of an extended set of thermochemical radii). Second, it makes possible the acquisition of Lattice energy estimates for salts which, up until now, except for simple 1:1 salts, could not be considered because of lack of crystal structure data. We have generalized Bartlett's correlation for MX (1:1) salts, between the Lattice enthalpy and the inverse cube root of the molecular (formula unit) volume, such as to render it applicable across an extended range of ionic salts for the estimation of Lattice Potential energies. When new salts are synthesized, acquisition of full crystal structure data is not always possible and powder data provides only minimal structural in...
J Petkovic - One of the best experts on this subject based on the ideXlab platform.
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zb tetraquark channel from Lattice qcd and born oppenheimer approximation
Physics Letters B, 2020Co-Authors: Sasa Prelovsek, H Bahtiyar, J PetkovicAbstract:Abstract Two Z b hadrons with exotic quark structure b ¯ b d ¯ u were discovered by Belle experiment. We present a Lattice QCD study of the b ¯ b d ¯ u system in the approximation of static b quarks, where the total spin of heavy quarks is fixed to one. The energies of eigenstates are determined as a function of the separation r between b and b ¯ . The lower eigenstates are related to a bottomonium and a pion. The eigenstate dominated by B B ¯ ⁎ has energy significantly below m B + m B ⁎ , which points to a sizable attraction for small r. The attractive Potential V ( r ) between B and B ¯ ⁎ is extracted assuming that this eigenstate is related exclusively to B B ¯ ⁎ . The Schrodinger equation for B B ¯ ⁎ within the extracted Potential leads to a virtual bound state, whose mass depends on the parametrization of the Lattice Potential. For certain parametrizations, we find a virtual bound state slightly below B B ¯ ⁎ threshold and a narrow peak in the B B ¯ ⁎ rate above threshold - these features could be related to Z b ( 10610 ) in the experiment. We surprisingly find also a deep bound state within the undertaken approximations.
Sasa Prelovsek - One of the best experts on this subject based on the ideXlab platform.
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zb tetraquark channel from Lattice qcd and born oppenheimer approximation
Physics Letters B, 2020Co-Authors: Sasa Prelovsek, H Bahtiyar, J PetkovicAbstract:Abstract Two Z b hadrons with exotic quark structure b ¯ b d ¯ u were discovered by Belle experiment. We present a Lattice QCD study of the b ¯ b d ¯ u system in the approximation of static b quarks, where the total spin of heavy quarks is fixed to one. The energies of eigenstates are determined as a function of the separation r between b and b ¯ . The lower eigenstates are related to a bottomonium and a pion. The eigenstate dominated by B B ¯ ⁎ has energy significantly below m B + m B ⁎ , which points to a sizable attraction for small r. The attractive Potential V ( r ) between B and B ¯ ⁎ is extracted assuming that this eigenstate is related exclusively to B B ¯ ⁎ . The Schrodinger equation for B B ¯ ⁎ within the extracted Potential leads to a virtual bound state, whose mass depends on the parametrization of the Lattice Potential. For certain parametrizations, we find a virtual bound state slightly below B B ¯ ⁎ threshold and a narrow peak in the B B ¯ ⁎ rate above threshold - these features could be related to Z b ( 10610 ) in the experiment. We surprisingly find also a deep bound state within the undertaken approximations.