Physics
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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: 6173532600
Fax: 6173539393
Website: buphy.bu.edu
All materials in OpenBU are subject to Title 17 of the U.S. Code.
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Quantum phases of SrCu₂(BO₃)₂ from highpressure thermodynamics
(20200522)We report heat capacity measurements of SrCu₂(BO₃)₂ under high pressure along with simulations of relevant quantum spin models and map out the (P,T) phase diagram of the material. We find a firstorder quantum phase ... 
NMR relaxation in the spin1 Heisenberg chain
(American Physical Society (APS), 20190909)We consider the isotropic S=1 Heisenberg chain with a finite Haldane gap Δ and use stateoftheart numerical techniques to investigate its dynamical properties at finite temperature, focusing on the nuclear spinlattice ... 
Scaling and diabatic effects in quantum annealing with a DWave device
(20200306)We discuss quantum annealing of the twodimensional transversefield Ising model on a DWave device, encoded on L×L lattices with L≤32. Analyzing the residual energy and deviation from maximal magnetization in the final ... 
BoseEinstein condensation of deconfined spinons in two dimensions
(American Physical Society (APS), 20200311)The transition between the Néel antiferromagnet and the valencebond solid state in two dimensions has become a paradigmatic example of deconfined quantum criticality, a nonLandau transition characterized by fractionalized ... 
Existence of a spectral gap in the AffleckKennedyLiebTasaki model on the hexagonal lattice
(20200501)The S=1 AffleckKennedyLiebTasaki (AKLT) quantum spin chain was the first rigorous example of an isotropic spin system in the Haldane phase. The conjecture that the S=3/2 AKLT model on the hexagonal lattice is also in a ... 
Hilbert space fragmentation and AshkinTeller criticality in fluctuation coupled Ising models
(American Physical Society (APS), 20200131)We discuss the effects of exponential fragmentation of the Hilbert space on phase transitions in the context of coupled ferromagnetic Ising models in arbitrary dimension with special emphasis on the onedimensional case. ... 
Comment on “Gapless spin liquid ground state of the spin 12 J1−J2 Heisenberg model on square lattices”
(American Physical Society (APS), 20200409)Liu et al. [Phys. Rev. B 98, 241109 (2018)] used Monte Carlo sampling of the physical degrees of freedom of a projected entangled pair state type wave function for the S=1/2 frustrated J1−J2 Heisenberg model on the square ... 
Monte Carlo renormalization flows in the space of relevant and irrelevant operators: application to threedimensional clock models
(20200228)We study renormalization group flows in a space of observables computed by Monte Carlo simulations. As an example, we consider threedimensional clock models, i.e., the XY spin model perturbed by a Z_{q} symmetric anisotropy ... 
Consistent scaling exponents at the deconfined quantumcritical point
(IOP Publishing, 202005)We report a quantum Monte Carlo study of the phase transition between antiferromagnetic and valencebond solid ground states in the squarelattice S = 1/2 J–Q model. The critical correlation function of the Q terms gives ... 
Valencebond solids, vestigial order, and emergent SO(5) symmetry in a twodimensional quantum magnet
We introduce a quantum spin1/2 model with manybody correlated Heisenbergtype interactions on the twodimensional square lattice, designed so that the system can host a fourfold degenerate plaquette valencebond solid ...