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Kanasz-Nagy, M; Ashida, Y1; Shi, T3; Moca, CP; Ikeda, TN; Folling, S8; Cirac, JI; Zarand, G4,5; Demler, EA
Exploring the anisotropic Kondo model in and out of equilibrium with alkaline-earth atoms
Source PublicationPHYSICAL REVIEW B
AbstractWe propose a scheme to realize the Kondo model with tunable anisotropy using alkaline-earth atoms in an optical lattice. The new feature of our setup is Floquet engineering of interactions using time-dependent Zeeman shifts, that can be realized either using state-dependent optical Stark shifts or magnetic fields. The properties of the resulting Kondo model strongly depend on the anisotropy of the ferromagnetic interactions. In particular, easy-plane couplings give rise to Kondo singlet formation even though microscopic interactions are all ferromagnetic. We discuss both equilibrium and dynamical properties of the system that can be measured with ultracold atoms, including the impurity spin susceptibility, the impurity spin relaxation rate, as well as the equilibrium and dynamical spin correlations between the impurity and the ferromagnetic bath atoms. We analyze the nonequilibrium time evolution of the system using a variational non-Gaussian approach, which allows us to explore coherent dynamics over both short and long timescales, as set by the bandwidth and the Kondo singlet formation, respectively. In the quench-type experiments, when the Kondo interaction is suddenly switched on, we find that real-time dynamics shows crossovers reminiscent of poor man's renormalization group flow used to describe equilibrium systems. For bare easy-plane ferromagnetic couplings, this allows us to follow the formation of the Kondo screening cloud as the dynamics crosses over from ferromagnetic to antiferromagnetic behavior. On the other side of the phase diagram, our scheme makes it possible to measure quantum corrections to the well-known Korringa law describing the temperature dependence of the impurity spin relaxation rate. Theoretical results discussed in our paper can be measured using currently available experimental techniques.
Subject AreaMaterials Science ; Physics
MOST Discipline CatalogueMaterials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
Indexed BySCIE
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Cited Times:18[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.[Kanasz-Nagy, Marton; Demler, Eugene A.] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
2.Univ Tokyo, Dept Phys, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan
3.Max Planck Inst Quantum Opt, Hans Kopfermann Str 1, D-85748 Garching, Germany
4.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, POB 2735, Beijing 100190, Peoples R China
5.Budapest Univ Technol & Econ, MTA BME Exot Quantum Phases Momentum Res Grp, H-1111 Budapest, Hungary
6.Budapest Univ Technol & Econ, Dept Theoret Phys, H-1111 Budapest, Hungary
7.Univ Oradea, Dept Phys, Oradea 410087, Romania
8.Ikeda, Tatsuhiko N.] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan
9.Ludwig Maximilians Univ Munchen, Fak Phys, Schellingstrae 4, D-80799 Munich, Germany
Recommended Citation
GB/T 7714
Kanasz-Nagy, M,Ashida, Y,Shi, T,et al. Exploring the anisotropic Kondo model in and out of equilibrium with alkaline-earth atoms[J]. PHYSICAL REVIEW B,2018,97(15):155156.
APA Kanasz-Nagy, M.,Ashida, Y.,Shi, T.,Moca, CP.,Ikeda, TN.,...&Demler, EA.(2018).Exploring the anisotropic Kondo model in and out of equilibrium with alkaline-earth atoms.PHYSICAL REVIEW B,97(15),155156.
MLA Kanasz-Nagy, M,et al."Exploring the anisotropic Kondo model in and out of equilibrium with alkaline-earth atoms".PHYSICAL REVIEW B 97.15(2018):155156.
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