Zobrazeno 1 - 10
of 429
pro vyhledávání: '"Sandvik, A. W."'
Ground state of the S = 1/2 Heisenberg spin chain with random ferro- and antiferromagnetic couplings
We study the Heisenberg $S=1/2$ chain with random ferro- and antiferromagnetic couplings, using quantum Monte Carlo simulations at ultra-low temperatures, converging to the ground state. Finite-size scaling of correlation functions and excitation gap
Externí odkaz:
http://arxiv.org/abs/2408.12911
We study the excitation spectrum of the $S=1/2$ Heisenberg model on the randomly diluted square lattice by analytic continuation of QMC data. At dilution fractions $p=1/16$ and $p=1/8$, the dynamic structure factor $S({\bf q},\omega)$ exhibits a damp
Externí odkaz:
http://arxiv.org/abs/2408.06749
Autor:
Sandvik, Anders W.
In critical lattice models, distance ($r$) dependent correlation functions contain power laws $r^{-2\Delta}$ governed by scaling dimensions $\Delta$ of an underlying continuum field theory. In Monte Carlo simulations and other numerical approaches, t
Externí odkaz:
http://arxiv.org/abs/2406.12681
Stochastic Analytic Continuation (SAC) of Quantum Monte Carlo (QMC) imaginary-time correlation function data is a valuable tool in connecting many-body models to experimentally measurable dynamic response functions. Recent developments of the SAC met
Externí odkaz:
http://arxiv.org/abs/2406.06763
We resolve the nature of the quantum phase transition between a N\'eel antiferromagnet and a valence-bond solid in two-dimensional spin-1/2 magnets. We study a class of $J$-$Q$ models, in which Heisenberg exchange $J$ competes with interactions $Q_n$
Externí odkaz:
http://arxiv.org/abs/2405.06607
Autor:
King, Andrew D., Nocera, Alberto, Rams, Marek M., Dziarmaga, Jacek, Wiersema, Roeland, Bernoudy, William, Raymond, Jack, Kaushal, Nitin, Heinsdorf, Niclas, Harris, Richard, Boothby, Kelly, Altomare, Fabio, Berkley, Andrew J., Boschnak, Martin, Chern, Kevin, Christiani, Holly, Cibere, Samantha, Connor, Jake, Dehn, Martin H., Deshpande, Rahul, Ejtemaee, Sara, Farré, Pau, Hamer, Kelsey, Hoskinson, Emile, Huang, Shuiyuan, Johnson, Mark W., Kortas, Samuel, Ladizinsky, Eric, Lai, Tony, Lanting, Trevor, Li, Ryan, MacDonald, Allison J. R., Marsden, Gaelen, McGeoch, Catherine C., Molavi, Reza, Neufeld, Richard, Norouzpour, Mana, Oh, Travis, Pasvolsky, Joel, Poitras, Patrick, Poulin-Lamarre, Gabriel, Prescott, Thomas, Reis, Mauricio, Rich, Chris, Samani, Mohammad, Sheldan, Benjamin, Smirnov, Anatoly, Sterpka, Edward, Clavera, Berta Trullas, Tsai, Nicholas, Volkmann, Mark, Whiticar, Alexander, Whittaker, Jed D., Wilkinson, Warren, Yao, Jason, Yi, T. J., Sandvik, Anders W., Alvarez, Gonzalo, Melko, Roger G., Carrasquilla, Juan, Franz, Marcel, Amin, Mohammad H.
Quantum computers hold the promise of solving certain problems that lie beyond the reach of conventional computers. Establishing this capability, especially for impactful and meaningful problems, remains a central challenge. One such problem is the s
Externí odkaz:
http://arxiv.org/abs/2403.00910
Autor:
D'Emidio, Jonathan, Sandvik, Anders W.
We study the R\'enyi entanglement entropy (EE) of the two-dimensional $J$-$Q$ model, the emblematic quantum spin model of deconfined criticality at the phase transition between antiferromagnetic and valence-bond-solid ground states. State-of-the-art
Externí odkaz:
http://arxiv.org/abs/2401.14396
Publikováno v:
Phys. Rev. B 109, L140408 (2024)
Using quantum Monte Carlo simulations and field-theory arguments, we study the fully frustrated (Villain) transverse-field Ising model on the square lattice. We consider a "primary" spin order parameter and a "secondary" dimer order parameter, which
Externí odkaz:
http://arxiv.org/abs/2309.02407
Deconfined quantum criticality (DQC) arises from fractionalization of quasi-particles and leads to fascinating behaviors beyond the Landau-Ginzburg-Wilson (LGW) description of phase transitions. The unusual aspects of DQC in equilibrium also suggest
Externí odkaz:
http://arxiv.org/abs/2305.04771
Autor:
Sandvik, O. W., Müller, A. M., Ånes, H. W., Zahn, M., He, J., Fiebig, M., Lottermoser, Th., Rojac, T., Meier, D., Schultheiß, J.
Mechanical pressure controls the structural, electric, and magnetic order in solid state systems, allowing to tailor and improve their physical properties. A well-established example is ferroelastic ferroelectrics, where the coupling between pressure
Externí odkaz:
http://arxiv.org/abs/2304.08423