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The Emergent Fine Structure Constant of Quantum Spin Ice Is Large | Salvatore D. Pace
; Siddhardh C. Morampudi
; Roderich Moessner
; Chris R. Laumann
; | Date: |
9 Sep 2020 | Abstract: | Condensed matter systems act as mini-universes with emergent low-energy
properties drastically different from those of the standard model. A case in
point is the emergent quantum electrodynamics (QED) in the fractionalized
topological magnet known as quantum spin ice, whose magnetic monopoles set it
apart from the familiar QED of the world we live in. Here, we show that the two
greatly differ in their fine-structure constant $alpha$, which parametrizes
how strongly matter couples to light: $alpha_{mathrm{QSI}}$ is more than an
order of magnitude greater than $alpha_{mathrm{QED}} approx 1/137$.
Furthermore, $alpha_{mathrm{QSI}}$, the emergent speed of light, and all
other parameters of the emergent QED, are tunable by engineering the
microscopic Hamiltonian. We find that $alpha_{mathrm{QSI}}$ can be tuned all
the way from zero up to what is believed to be the $ extit{strongest
possible}$ coupling beyond which QED confines. In view of the small size of its
Hilbert space, this marks out quantum spin ice as an ideal platform for
studying exotic quantum field theories, and a target for noisy
intermediate-scale quantum computing. The large $alpha_{mathrm{QSI}}$ implies
that experiments probing candidate condensed-matter realizations of quantum
spin ice should expect to observe phenomena arising due to strong interactions
such as well-defined Coulomb bound states, Sommerfeld enhancement of particle
pair creation, and copious emergent Cerenkov radiation. At finite temperature,
the system further provides a platform for studying a strongly coupled
electro-magnetic plasma. | Source: | arXiv, 2009.04499 | Services: | Forum | Review | PDF | Favorites |
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