Zobrazeno 1 - 10
of 48
pro vyhledávání: '"Ribhu K. Kaul"'
Publikováno v:
Physical Review B. 107
Monolayer graphene at charge neutrality in a quantizing magnetic field is a quantum Hall ferromagnet. Due to the spin and valley (near) degeneracies, there is a plethora of possible ground states. Previous theoretical work, based on a stringent ultra
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https://doi.org/10.1103/physrevb.107.125422
https://doi.org/10.1103/physrevb.107.125422
Publikováno v:
Physical Review B. 107
We study the edge spectrum of twisted sheets of single layer and bilayer graphene in cases where the continuum model predicts a valley Chern insulator -- an insulating state in which the occupied moir\'e mini-bands from each valley have a net Chern n
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https://doi.org/10.1103/physrevb.107.085138
https://doi.org/10.1103/physrevb.107.085138
We propose a device in which a sheet of graphene is coupled to a Weyl semimetal, allowing for the physical access to the study of tunneling from two-dimensional to three dimensional massless Dirac fermions. Due to the reconstructed band structure, we
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http://arxiv.org/abs/2102.12691
http://arxiv.org/abs/2102.12691
Publikováno v:
Physical Review
We introduce a half-filled Hamiltonian of spin-half lattice fermions that can be studied with the efficient meron-cluster algorithm in any dimension. As with the usual bipartite half-filled Hubbard models, the na\"ive $U(2)$ symmetry is enhanced to $
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http://arxiv.org/abs/2011.13208
http://arxiv.org/abs/2011.13208
Publikováno v:
Physical Review B. 101
We study the N\'eel to fourfold columnar valence bond solid (cVBS) quantum phase transition in a sign-free $S=1$ square-lattice model. This is the same kind of transition that for $S=1/2$ has been argued to realize the prototypical deconfined critica
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https://doi.org/10.1103/physrevb.101.045111
https://doi.org/10.1103/physrevb.101.045111
Publikováno v:
Physical Review B. 101
We present a study of a simple model antiferromagnet consisting of a sum of nearest-neighbor $\mathrm{SO}(N)$ singlet projectors on the kagome lattice. Our model shares some features with the popular $S=1/2$ kagome antiferromagnet but is specifically
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https://doi.org/10.1103/physrevb.101.020402
https://doi.org/10.1103/physrevb.101.020402
Publikováno v:
Proceedings of 37th International Symposium on Lattice Field Theory — PoS(LATTICE2019).
We construct a fermionic lattice model containing interacting spin-$\frac{1}{2}$ fermions with an $O(4)$ symmetry. In addition the model contains a $\mathbb{Z}_2$ chiral symmetry which prevents a fermion mass term. Our model is motivated by the abili
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https://doi.org/10.22323/1.363.0222
https://doi.org/10.22323/1.363.0222
Autor:
Tyrel M. McQueen, Jason W. Krizan, C. M. Morris, J. Viirok, N. P. Armitage, Nisheeta Desai, Ribhu K. Kaul, Toomas Rõõm, Urmas Nagel, D. Hüvonen, Robert J. Cava, Seyed Koohpayeh
The Ising chain in transverse field is a paradigmatic model for a host of physical phenomena, including spontaneous symmetry breaking, topological defects, quantum criticality, and duality. Although the quasi-1D ferromagnet CoNb$_2$O$_6$ has been put
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Autor:
Nisheeta Desai, Ribhu K. Kaul
Publikováno v:
Physical Review Letters. 123
We introduce a strategy to write down lattice models of spin rotational symmetric Hamiltonians with arbitrary spin $S$ that are Marshall positive and can be simulated efficiently using world-line Monte Carlo methods. As an application of our approach
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https://doi.org/10.1103/physrevlett.123.107202
https://doi.org/10.1103/physrevlett.123.107202
We study the band structure of electrons hopping on a honeycomb lattice with 1/q (q integer) flux quanta through each elementary hexagon. In the nearest neighbor hopping model the two bands that eventually form the n = 0 Landau level have 2q zero ene
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