%0 Journal Article %1 PhysRevLett.123.067204 %A Tomasello, Bruno %A Castelnovo, Claudio %A Moessner, Roderich %A Quintanilla, Jorge %D 2019 %I American Physical Society %J Phys. Rev. Lett. %K b %N 6 %P 067204 %R 10.1103/PhysRevLett.123.067204 %T Correlated quantum tunneling of monopoles in spin ice %U https://link.aps.org/doi/10.1103/PhysRevLett.123.067204 %V 123 %X The spin ice materials $Ho_2Ti_2O_7$ and $Dy_2Ti_2O_7$ are by now perhaps the best-studied classical frustrated magnets. A crucial step towards the understanding of their low temperature behavior—both regarding their unusual dynamical properties and the possibility of observing their quantum coherent time evolution—is a quantitative understanding of the spin-flip processes which underpin the hopping of magnetic monopoles. We attack this problem in the framework of a quantum treatment of a single-ion subject to the crystal, exchange, and dipolar fields from neighboring ions. By studying the fundamental quantum mechanical mechanisms, we discover a bimodal distribution of hopping rates that depends on the local spin configuration, in broad agreement with rates extracted from experiment. Applying the same analysis to $Pr_2Sn_2O_7$ and $Pr_2Zr_2O_7$, we find an even more pronounced separation of timescales signaling the likelihood of coherent many-body dynamics.

@article{PhysRevLett.123.067204, abstract = {The spin ice materials $Ho_2Ti_2O_7$ and $Dy_2Ti_2O_7$ are by now perhaps the best-studied classical frustrated magnets. A crucial step towards the understanding of their low temperature behavior—both regarding their unusual dynamical properties and the possibility of observing their quantum coherent time evolution—is a quantitative understanding of the spin-flip processes which underpin the hopping of magnetic monopoles. We attack this problem in the framework of a quantum treatment of a single-ion subject to the crystal, exchange, and dipolar fields from neighboring ions. By studying the fundamental quantum mechanical mechanisms, we discover a bimodal distribution of hopping rates that depends on the local spin configuration, in broad agreement with rates extracted from experiment. Applying the same analysis to $Pr_2Sn_2O_7$ and $Pr_2Zr_2O_7$, we find an even more pronounced separation of timescales signaling the likelihood of coherent many-body dynamics.}, added-at = {2019-08-14T11:05:36.000+0200}, author = {Tomasello, Bruno and Castelnovo, Claudio and Moessner, Roderich and Quintanilla, Jorge}, biburl = {https://www.bibsonomy.org/bibtex/2389170bc55fa1ea7b15deefe1ca59477/ctqmat}, day = 9, description = {Phys. Rev. Lett. 123, 067204 (2019) - Correlated Quantum Tunneling of Monopoles in Spin Ice}, doi = {10.1103/PhysRevLett.123.067204}, interhash = {d5d5e1264adbbd0a1ba1e62a90f91255}, intrahash = {389170bc55fa1ea7b15deefe1ca59477}, journal = {Phys. Rev. Lett.}, keywords = {b}, month = {08}, number = 6, numpages = {6}, pages = 067204, publisher = {American Physical Society}, timestamp = {2023-10-13T12:44:26.000+0200}, title = {Correlated quantum tunneling of monopoles in spin ice}, url = {https://link.aps.org/doi/10.1103/PhysRevLett.123.067204}, volume = 123, year = 2019 }