Zobrazeno 1 - 10
of 494
pro vyhledávání: '"Beach, K"'
Publikováno v:
Phys. Rev. B 110, L121123 (2024)
Twisted bilayer graphene near the magic angle is known to have a cascade of insulating phases at integer filling factors of the low-energy bands. In this Letter we address the nature of these phases through an unrestricted, large-scale Hartree-Fock c
Externí odkaz:
http://arxiv.org/abs/2308.03843
Autor:
Adhikari, Sudeep, Beach, K. S. D.
Publikováno v:
Physical Review Research 5, 043068 (2023)
The thermal activation process by which a system passes from one local energy minimum to another is a recurring motif in physics, chemistry, and biology. For instance, biopolymer chains are typically modeled in terms of energy landscapes, with folded
Externí odkaz:
http://arxiv.org/abs/2203.16277
Autor:
Adhikari, Khagendra, Beach, K. S. D.
Publikováno v:
Phys. Rev. B 104, 115149 (2021)
The dynamical behavior of a quantum many-particle system is characterized by the lifetime of its excitations. When the system is perturbed, observables of any non-conserved quantity decay exponentially, but those of a conserved quantity relax to equi
Externí odkaz:
http://arxiv.org/abs/2011.07110
Autor:
Adhikari, Khagendra, Beach, K. S. D.
Publikováno v:
Phys. Rev. B 102, 184415 (2020)
We introduce a generalization of the Fredkin spin chain with tunable three-body interactions expressed in terms of conventional spin-half operators. Of the model's two free parameters, one controls the preference for Ising antiferromagnetism and the
Externí odkaz:
http://arxiv.org/abs/2008.09736
Autor:
Adhikari, Sudeep, Beach, K. S. D.
Publikováno v:
Phys. Rev. Research 2, 023276 (2020)
The structural dynamics of a biopolymer is governed by a process of diffusion through its conformational energy landscape. In pulling experiments using optical tweezers, features of the energy landscape can be extracted from the probability distribut
Externí odkaz:
http://arxiv.org/abs/2001.02702
We address the problem of free fermions interacting with frozen gauge fields. In particular, we consider a tight-binding model of fermions on the square lattice in which (i) flux 0 or $\pi$ is threaded through each plaquette and (ii) each nearest-nei
Externí odkaz:
http://arxiv.org/abs/1904.03220
Akademický článek
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Autor:
Adhikari, Khagendra, Beach, K. S. D.
Publikováno v:
Phys. Rev. B 99, 054436 (2019)
The Fredkin model describes a spin-half chain segment subject to three-body, correlated-exchange interactions and twisted boundary conditions. The model is frustration-free, and its ground state wave function is known exactly. Its low-energy physics
Externí odkaz:
http://arxiv.org/abs/1805.00532
Autor:
Wierschem, Keola, Beach, K. S. D.
Publikováno v:
Phys. Rev. B 93, 245141 (2016)
The strange correlator [Phys. Rev. Lett. 112, 247202 (2014)] has been proposed as a measure of symmetry protected topological order in one- and two-dimensional systems. It takes the form of a spin-spin correlation function, computed as a mixed overla
Externí odkaz:
http://arxiv.org/abs/1603.03444
Publikováno v:
Phys. Rev. B 95, 085110 (2017)
Interaction-driven topological phase transitions in Dirac semimetals are investigated by means of large-scale quantum Monte Carlo (QMC) simulations. The interaction among Dirac fermions is introduced by coupling them to Ising spins that realize the q
Externí odkaz:
http://arxiv.org/abs/1602.07150