Zobrazeno 1 - 10
of 149
pro vyhledávání: '"Jaan Oitmaa"'
Autor:
Rajiv R. P. Singh, Jaan Oitmaa
Publikováno v:
Physical Review B. 106
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a8853e45ccb17c381bd2c1063092a30f
https://doi.org/10.1103/physrevb.106.014424
https://doi.org/10.1103/physrevb.106.014424
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::49610b0e9bc979bcc72840a600ed296b
http://arxiv.org/abs/2203.14356
http://arxiv.org/abs/2203.14356
Autor:
Rajiv R. P. Singh, Jaan Oitmaa
Publikováno v:
Physical Review A. 105
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::18c1dd13552f429e788621a240288ba1
https://doi.org/10.1103/physreva.105.033317
https://doi.org/10.1103/physreva.105.033317
Autor:
Jaan Oitmaa
Publikováno v:
Physical Review B. 103
We use series expansion methods to investigate the zero-temperature phase diagram of a spin-$\frac{1}{2}$ Heisenberg frustrated bilayer model. For different parameter regions the model shows two related antiferromagnetic phases as well as a nonmagnet
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ea366d64c528a6877d094305822ed2ea
https://doi.org/10.1103/physrevb.103.214446
https://doi.org/10.1103/physrevb.103.214446
Autor:
Jaan Oitmaa
Publikováno v:
Physical Review B. 101
We use series expansion methods to investigate the phase diagram of a spin-1/2 Heisenberg antiferromagnet on the triangular lattice with first- and second-neighbor interactions. We find regions of ${120}^{\ensuremath{\circ}}$ and collinear ``stripe''
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::97ca08bbc49c5f20d72382e850ec0236
https://doi.org/10.1103/physrevb.101.214422
https://doi.org/10.1103/physrevb.101.214422
Publikováno v:
Physical review. E. 103(2-1)
We study the thermodynamic properties of modified spin-$S$ Kitaev models introduced by Baskaran, Sen and Shankar (Phys. Rev. B 78, 115116 (2008)). These models have the property that for half-odd-integer spins their eigenstates map on to those of spi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bcfe538151146eeaefb8f34e66ec2195
https://pubmed.ncbi.nlm.nih.gov/33736061
https://pubmed.ncbi.nlm.nih.gov/33736061
Antiferromagnetic quantum spin systems can exhibit a transition between collinear and spiral ground states, driven by frustration. Classically this is a smooth crossover and the crossover point is termed a Lifshitz point. Quantum fluctuations change
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3d9b488d58aa97bbb48367f3f98942eb
http://arxiv.org/abs/1910.09733
http://arxiv.org/abs/1910.09733
Autor:
Jaan Oitmaa
Publikováno v:
Physical Review B. 99
We use series expansion methods to investigate the phase diagram of a spin-1/2 Heisenberg antiferromagnet on a diamond lattice with first- and second-neighbor interactions. Using series expansions at $T=0$, we find an apparent second-order transition
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::117deb11bd0f7d7e16c9f91b39a75bbf
https://doi.org/10.1103/physrevb.99.134407
https://doi.org/10.1103/physrevb.99.134407
Publikováno v:
Physical Review B. 98
Three decades ago Ioffe and Larkin pointed out a generic mechanism for the formation of a gapped spin liquid. In the case when a classical two-dimensional (2D) frustrated Heisenberg magnet undergoes a Lifshitz transition between a collinear N\'eel ph
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2dc889e45b23fdc408079aa43a21cbad
https://doi.org/10.1103/physrevb.98.144420
https://doi.org/10.1103/physrevb.98.144420
Publikováno v:
Physical review letters, vol 121, iss 6
Physical Review Letters
Physical Review Letters, American Physical Society, 2018, 121, pp.067201. ⟨10.1103/PhysRevLett.121.067201⟩
Benton, O; Jaubert, LDC; Singh, RRP; Oitmaa, J; & Shannon, N. (2018). Quantum Spin Ice with Frustrated Transverse Exchange: From a π-Flux Phase to a Nematic Quantum Spin Liquid. Physical Review Letters, 121(6), 067201. doi: 10.1103/PhysRevLett.121.067201. UC Davis: Retrieved from: http://www.escholarship.org/uc/item/1rn5v8rg
Physical Review Letters
Physical Review Letters, American Physical Society, 2018, 121, pp.067201. ⟨10.1103/PhysRevLett.121.067201⟩
Benton, O; Jaubert, LDC; Singh, RRP; Oitmaa, J; & Shannon, N. (2018). Quantum Spin Ice with Frustrated Transverse Exchange: From a π-Flux Phase to a Nematic Quantum Spin Liquid. Physical Review Letters, 121(6), 067201. doi: 10.1103/PhysRevLett.121.067201. UC Davis: Retrieved from: http://www.escholarship.org/uc/item/1rn5v8rg
Quantum spin ice materials, pyrochlore magnets with competing Ising and transverse exchange interactions, have been widely discussed as candidates for a quantum spin-liquid ground state. Here, motivated by quantum chemical calculations for Pr pyrochl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::05c22bd4b022f15b8fbc601fd62fb23a
https://escholarship.org/uc/item/1rn5v8rg
https://escholarship.org/uc/item/1rn5v8rg