Zobrazeno 1 - 10
of 99
pro vyhledávání: '"Pujari, Sumiran"'
Autor:
Channarayappa, Sharath Kumar, Kumar, Sankalp, Vidhyadhiraja, N. S., Pujari, Sumiran, Saravanan, M. P., Sebastian, Amal, Choi, Eun Sang, Chikara, Shalinee, Nambi, Dolly, Suresh, Athira, Lal, Siddhartha, Jaiswal-Nagar, D.
The ground state of a one-dimensional spin-1/2 uniform antiferromagnetic Heisenberg chain (AfHc) is a Tomonaga-Luttinger liquid which is quantum-critical with respect to applied magnetic fields upto a saturation field Hs beyond which it transforms to
Externí odkaz:
http://arxiv.org/abs/2408.11163
Autor:
Sengupta, Shamashis, Farhadizadeh, Alireza, Youssef, Joe, Loucif, Sara, Pallier, Florian, Dumoulin, Louis, Saha, Kasturi, Pujari, Sumiran, Oden, Magnus, Marrache-Kikuchi, Claire, Monteverde, Miguel
Phase transitions in many-body systems are often associated with the emergence of spatial inhomogeneities. Such features may develop at microscopic lengthscales and are not necessarily evident in measurements of macroscopic quantities. In this work,
Externí odkaz:
http://arxiv.org/abs/2407.16662
Autor:
Pujari, Sumiran
The physics of the paradigmatic one-dimensional transverse field quantum Ising model $J \sum_{\langle i,j \rangle} \sigma^x_i \sigma^x_j + h \sum_i \sigma^z_i$ is well-known. Instead, let us imagine "applying" the transverse field via a transverse Is
Externí odkaz:
http://arxiv.org/abs/2407.06236
Autor:
Pujari, Sumiran
We write down a class of two-dimensional quantum spin-1/2 Hamiltonians whose eigenspectra are exactly solvable via the Jordan-Wigner transformation. The general structure corresponds to a suitable grid composed of XY or XX-Ising spin chains and ZZ-Is
Externí odkaz:
http://arxiv.org/abs/2406.17034
Autor:
Pujari, Sumiran
This contribution summarizes the main results of a work on exactly solvable Hamiltonians for quantum magnets. A class of Hamiltonians which supports fractionalized spinless fermionic excitations in dimensions greater than one is written down. A well-
Externí odkaz:
http://arxiv.org/abs/2406.10669
We report the synthesis and properties of (H,Li)$_{6}$Ru$_{2}$O$_{6}$, which is shown to be a $J_{\text{eff}}=\frac{1}{2}$ system made out of Ru$^{3+}$ moments in a honeycomb geometry. Bulk magnetization, heat capacity, nuclear magnetic resonance (NM
Externí odkaz:
http://arxiv.org/abs/2405.06380
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
Publikováno v:
Phys. Rev. Lett. 130, 186202 (2023)
Topological insulator-based methods underpin the topological classification of gapped bands, including those surrounding semi-metallic nodal defects. However, multiple bands with gap-closing points can also possess non-trivial topology. We construct
Externí odkaz:
http://arxiv.org/abs/2205.07814
Publikováno v:
Quantum Inf Process 22, 289 (2023)
Nitrogen-Vacancy (NV) centers in diamonds provide a room-temperature platform for various emerging quantum technologies, e.g. the long nuclear spin coherence times as potential quantum memory registers. We demonstrate a freezing protocol for an NV ce
Externí odkaz:
http://arxiv.org/abs/2204.03877