Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Desai, Nisheeta"'
We use stochastic series expansion (SSE) quantum Monte Carlo (QMC) methods to study the phases and transitions displayed by a class of sign-free designer Hamiltonians for SU($N$) analogs of spin $S=1$ quantum antiferromagnets on the square lattice. T
Externí odkaz:
http://arxiv.org/abs/2309.12262
Berry phase interference arguments that underlie the theory of deconfined quantum criticality (DQC) for spin-$\frac{1}{2}$ antiferromagnets have also been invoked to allow for continuous transitions in spin-1 magnets including a N\'eel to (columnar)
Externí odkaz:
http://arxiv.org/abs/2307.14254
Autor:
Desai, Nisheeta, Pujari, Sumiran
Publikováno v:
Pramana - J Phys 97, 117 (2023)
We show here that a direct application of resummation-based quantum Monte Carlo (QMC) -- implemented recently for sign-problem-free SU(2)-symmetric Hamiltonians in the stochastic series expansion (SSE) framework -- does not reduce the sign problem fo
Externí odkaz:
http://arxiv.org/abs/2206.09692
Autor:
Desai, Nisheeta, Pujari, Sumiran
Publikováno v:
Phys. Rev. B 104, L060406 (2021)
For spin rotational symmetric models with a positive-definite high-temperature expansion of the partition function, a stochastic sampling of the series expansion upon partial resummation becomes logically equivalent to sampling an uncoloured closely-
Externí odkaz:
http://arxiv.org/abs/2104.06792
Publikováno v:
Phys. Rev. E 103, 042136 (2021)
We study the fully-packed dimer model on the bilayer square lattice with fugacity equal to $z$ ($1$) for inter-layer (intra-layer) dimers, and intra-layer interaction $V$ between neighbouring parallel dimers on any elementary plaquette in either laye
Externí odkaz:
http://arxiv.org/abs/2011.04506
Autor:
Morris, C. M., Desai, Nisheeta, Viirok, J., Huvonen, D., Nagel, U., Room, T., Krizan, J. W., Cava, R. J., McQueen, T. M., Koohpayeh, S. M., Kaul, Ribhu K., Armitage, N. P.
Publikováno v:
Nature Physics (2021)
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
Externí odkaz:
http://arxiv.org/abs/2009.14189
Autor:
Desai, Nisheeta, Kaul, Ribhu K.
Publikováno v:
Phys. Rev. B 102, 195135 (2020)
We study the quantum phase transition between the superfluid and valence bond solid in "easy-plane" J-Q models on the square lattice. The Hamiltonian we study is a linear combination of two model Hamiltonians: (1) an SU(2) symmetric model, which is t
Externí odkaz:
http://arxiv.org/abs/1909.12357
Autor:
Desai, Nisheeta, Kaul, Ribhu K.
Publikováno v:
Phys. Rev. Lett. 123, 107202 (2019)
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
Externí odkaz:
http://arxiv.org/abs/1904.09629
Publikováno v:
Phys. Rev. B 101, 045111 (2020)
We study the N\'eel to four-fold 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 critic
Externí odkaz:
http://arxiv.org/abs/1808.04731
Autor:
Desai, Nisheeta1 (AUTHOR), Pujari, Sumiran2 (AUTHOR) sumiran@phy.iitb.ac.in
Publikováno v:
Pramana: Journal of Physics. Sep2023, Vol. 97 Issue 3, p1-7. 7p.
