Witnessing entanglement in quantum critical CeRu4Sn6
Quantum criticality beyond the order parameter paradigm, which underlies the enigmatic strange metal state, is a key open problem in correlated quantum matter. Recent advances from the quantum information community nourish the hope that a new level of understanding could be achieved by assessing the degree of entanglement of this state. With the present proposal we set out to probe the quantum Fisher information and related entanglement witnesses by high-resolution inelastic neutron scattering (INS) measurements along several trajectories in the temperature¿magnetic field phase diagram of the heavy fermion compound CeRu4Sn6. Previous measurements of some of us have revealed energy-over-temperature scaling with a fractional critical exponent in zero-field INS data, and the suppression of this beyond orderparameter quantum criticality with modest magnetic fields. This together with theoretical predictions of long-range entanglement at such a ¿Kondo destruction¿ quantum critical point makes CeRu4Sn6 an ideal testbed.
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The recommended format for citing this dataset in a research publication is in the following format:
MAZZA Federico; FRIIS Nicolai; KIRSCHBAUM Diana Maria; MATHE Julia; PASCHEN Silke; Andrey Prokofiev; STEFFENS Paul; VITAGLIANO Giuseppe and XINLIN Yan. (2023). Witnessing entanglement in quantum critical CeRu4Sn6. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.DIR-291
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