Zobrazeno 1 - 10
of 301
pro vyhledávání: '"Singh, Rajiv R. P"'
We investigate the quantum phases of a frustrated antiferromagnetic Heisenberg spin-1/2 model Hamiltonian on a Kagome-strip chain (KSC), a one-dimensional analogue of the Kagome lattice, and construct its phase diagram in an extended exchange paramet
Externí odkaz:
http://arxiv.org/abs/2409.12530
Publikováno v:
Phys. Rev. B 110, 075112 (2024)
We study quantum criticality in the infinite range Transverse-Field Ising Model. We find subtle differences with respect to the well-known single-site mean-field theory, especially in terms of gap, entanglement and quantum criticality. The calculatio
Externí odkaz:
http://arxiv.org/abs/2408.02789
Autor:
Lozano-Gómez, Daniel, Noculak, Vincent, Oitmaa, Jaan, Singh, Rajiv R. P., Iqbal, Yasir, Reuther, Johannes, Gingras, Michel J. P.
Publikováno v:
Proc. Natl. Acad. Sci. U.S.A. 121, e2403487121 (2024)
Gauge theories are powerful tools in theoretical physics, allowing complex phenomena to be reduced to simple principles, and are used in both high-energy and condensed matter physics. In the latter context, gauge theories are becoming increasingly po
Externí odkaz:
http://arxiv.org/abs/2310.16682
High-temperature magnetization and entropy of the triangular lattice Hubbard model in a Zeeman field
We use strong coupling expansions to calculate the entropy function $S(T,h)$, the magnetization $M(T,h)$, and the double occupancy factor $D(T,h)$ for the half-filled triangular lattice Hubbard model as a function of temperature $T$ and Zeeman field
Externí odkaz:
http://arxiv.org/abs/2303.03550
Autor:
Noculak, Vincent, Lozano-Gómez, Daniel, Oitmaa, Jaan, Singh, Rajiv R. P., Iqbal, Yasir, Gingras, Michel J. P., Reuther, Johannes
Publikováno v:
Phys. Rev. B 107, 214414 (2023)
We investigate the ground state and critical temperature phase diagrams of the classical and quantum $S=1/2$ pyrochlore lattice with nearest-neighbor Heisenberg and Dzyaloshinskii-Moriya interactions (DMI). We consider ferromagnetic and antiferromagn
Externí odkaz:
http://arxiv.org/abs/2211.08823
Publikováno v:
Phys. Rev. B 105, L241410 (2022)
We use finite temperature strong coupling expansions to calculate thermodynamic properties of the Honeycomb-lattice SU(4) Hubbard model. We present numerical results for various properties including chemical potential, compressibility, entropy and sp
Externí odkaz:
http://arxiv.org/abs/2203.14356
We study the ground state and thermodynamic properties of the spin-half XXZ model, with an Ising interaction $J_z$ and a transverse exchange interaction $J_{x}$, on a pyrochlore tube obtained by joining together elementary cubes in a one-dimensional
Externí odkaz:
http://arxiv.org/abs/2203.00032
Autor:
Singh, Rajiv R. P., Oitmaa, Jaan
Publikováno v:
Phys. Rev. B 106, 014424 (2022)
Using finite temperature strong coupling expansions for the SU(N) Hubbard Model, we calculate the thermodynamic properties of the model in the infinite-$U$ limit for arbitrary density $0\leq \rho \leq 1$ and all $N$. We express the ferromagnetic susc
Externí odkaz:
http://arxiv.org/abs/2202.01611
Autor:
Singh, Rajiv R. P., Oitmaa, Jaan
Publikováno v:
Phys. Rev. A 105, 033317 (2022)
We develop finite temperature strong coupling expansions for the SU(N) Hubbard Model in powers of $\beta t$, $w=\exp{(-\beta U)}$ and ${1\over \beta U}$ for arbitrary filling. The expansions are done in the grand canonical ensemble and are most usefu
Externí odkaz:
http://arxiv.org/abs/2201.06677
Autor:
Singh, Rajiv R. P.
We discuss the thermodynamic and magnetic properties of a competing high-spin/low-spin two-orbital two-electron model on a square-lattice possibly relevant to the nickelates such as Ba$_2$NiO$_2$(AgSe)$_2$ (BNOAS). We focus on parameter regimes where
Externí odkaz:
http://arxiv.org/abs/2108.09706