Physics
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URI: http://hdl.handle.net/2144/1009
Physicists at Boston University look to open a window on the universe. An understanding of physics can elucidate everything from how a ball falls to the ground to what the early universe looked like, can shed light on the forces guiding the cosmos and the behavior of subatomic particles. A degree in physics provides the intellectual foundation for applications in engineering, technology, and industry, as well as in training the next generation of scientists at both the high school and university levels.
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Department chair: Andrei Ruckenstein
Campus address: 590 Commonwealth Avenue
Phone: 617-353-2600
Fax: 617-353-9393
Website: buphy.bu.edu
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Typicality at quantum-critical points
(IOP PUBLISHING LTD, 2018-08-01)We discuss the concept of typicality of quantum states at quantum-critical points, using projector Monte Carlo simulations of an S = 1/2 bilayer Heisenberg antiferromagnet as an illustration. With the projection (imaginary) ... -
Indicators of conformal field theory: Entanglement entropy and multiple-point correlators
(American Physical Society, 2017-07-27)The entanglement entropy (EE) of quantum systems is often used as a test of low-energy descriptions by conformal field theory (CFT). Here we point out that this is not a reliable indicator, as the EE often shows the same ... -
Symmetry enhanced first-order phase transition in a two-dimensional quantum magnet
Theoretical studies of quantum phase transitions have suggested critical points with higher symmetries than those of the underlying Hamiltonian. Here we demonstrate a surprising emergent symmetry of the coexistence state ... -
Numerical investigations of SO(4) emergent extended symmetry in spin-1/2 Heisenberg antiferromagnetic chains
(American Physical Society, 2018-07-10)The antiferromagnetic Heisenberg chain is expected to have an extended symmetry, [SU(2)×SU(2)]/Z2, in the infrared limit whose physical interpretation is that the spin and dimer order parameters form the components of a ... -
Insulator to superfluid transition in coupled photonic cavities in two dimensions
(2008-06-23)A system of coupled photonic cavities on a two-dimensional square lattice is systematically investigated using the stochastic series expansion quantum Monte Carlo method. The ground state phase diagram contains insulating ... -
Random-singlet phase in disordered two-dimensional quantum magnets
We study effects of disorder (randomness) in a 2D square-lattice S=1/2 quantum spin system, the J-Q model with a 6-spin interaction Q supplementing the Heisenberg exchange J. In the absence of disorder the system hosts ... -
Dynamical properties of the S=1/2 random Heisenberg chain
(American Physical Society, 2018-03-28)We study dynamical properties at finite temperature (T) of Heisenberg spin chains with random antiferromagnetic exchange couplings, which realize the random singlet phase in the low-energy limit, using three complementary ... -
Dual time scales in simulated annealing of a two-dimensional Ising spin glass
(American Physical Society, 2017-05-22)We apply a generalized Kibble-Zurek out-of-equilibrium scaling ansatz to simulated annealing when approaching the spin-glass transition at temperature T=0 of the two-dimensional Ising model with random J=±1 couplings. ... -
Field-driven quantum phase transitions in S=1/2 spin chains
(American Physical Society, 2017-05-25)We study the magnetization process of a one-dimensional extended Heisenberg model, the J−Q model, as a function of an external magnetic field h. In this model, J represents the traditional antiferromagnetic Heisenberg ... -
Critical level crossings and gapless spin liquid in the square-lattice spin-1/2 J1-J2 Heisenberg antiferromagnet
(2017-02-27)We use the DMRG method to calculate several energy eigenvalues of the frustrated S = 1 / 2 square-lattice J 1 - J 2 Heisenberg model on 2 L × L cylinders with L ≤ 10. We identify ...
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