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Abstract:

We study the asymmetric Hubbard model at half filling as a generic model to describe the physics of two species of repulsively interacting fermionic cold atoms in optical lattices. We use dynamical mean-field theory to obtain the paramagnetic phase diagram of the model as a function of temperature, interaction strength, and hopping asymmetry. A Mott transition with a region of two coexistent solutions is found for all nonzero values of the hopping asymmetry. At low temperatures the metallic phase is a heavy Fermi liquid, qualitatively analogous to the Fermi-liquid state of the symmetric Hubbard model. Above a coherence temperature, an orbital-selective crossover takes place, wherein one fermionic species effectively localizes, and the resulting bad metallic state resembles the non-Fermi-liquid state of the Falicov-Kimball model. We compute observables relevant to cold atom systems such as the double occupation, the specific heat, and entropy, and characterize their behavior in the different phases. © 2011 American Physical Society.

Registro:

Documento: Artículo
Título:Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices
Autor:Winograd, E.A.; Chitra, R.; Rozenberg, M.J.
Filiación:Laboratoire de Physique des Solides, CNRS-UMR8502, Université de Paris-Sud, Orsay F-91405, France
Laboratoire de Physique Theorique de la Matière Condenseé, UMR 7600, Université de Pierre et Marie Curie, Jussieu, Paris F-75005, France
Departamento de Física, FCEN, Ciudad Universitaria Pab.I, (1428) Buenos Aires, Argentina
Año:2011
Volumen:84
Número:23
DOI: http://dx.doi.org/10.1103/PhysRevB.84.233102
Título revista:Physical Review B - Condensed Matter and Materials Physics
Título revista abreviado:Phys. Rev. B Condens. Matter Mater. Phys.
ISSN:10980121
CODEN:PRBMD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10980121_v84_n23_p_Winograd

Referencias:

  • Bloch, I., Dalibard, J., Zwerger, W., (2008) Rev. Mod. Phys., 80, p. 885. , RMPHAT 0034-6861 10.1103/RevModPhys.80.885
  • Cazalilla, M.A., Ho, A.F., Giamarchi, T., Two-component fermi gas on internal-state-dependent optical lattices (2005) Physical Review Letters, 95 (22), pp. 1-4. , http://oai.aps.org/oai/?verb=ListRecords&metadataPrefix= oai_apsmeta_2&set=journal:PRL:95, DOI 10.1103/PhysRevLett.95.226402, 226402
  • Wang, B., Chen, H.-D., Das Sarma, S., (2009) Phys. Rev. A, 79, p. 051604. , PLRAAN 1050-2947 10.1103/PhysRevA.79.051604
  • Dao, T.-L., Georges, A., Capone, M., (2007) Phys. Rev. B, 76, p. 104517. , PRBMDO 1098-0121 10.1103/PhysRevB.76.104517
  • Lin, G.-D., Yi, W., Duan, L.-M., Superfluid shells for trapped fermions with mass and population imbalance (2006) Physical Review A - Atomic, Molecular, and Optical Physics, 74 (3), p. 031604. , http://oai.aps.org/oai?verb=GetRecord&Identifier=oai:aps.org: PhysRevA.74.031604&metadataPrefix=oai_apsmeta_2, DOI 10.1103/PhysRevA.74.031604
  • Esslinger, T., (2010) Annu. Rev. Condens. Matter Phys., 1, p. 129. , 1947-5454 10.1146/annurev-conmatphys-070909-104059
  • Chin, J.K., Miller, D.E., Liu, Y., Stan, C., Setiawan, W., Sanner, C., Xu, K., Ketterle, W., Evidence for superfluidity of ultracold fermions in an optical lattice (2006) Nature, 443 (7114), pp. 961-964. , DOI 10.1038/nature05224, PII NATURE05224
  • Giorgini, S., Pitaevskii, L.P., Stringari, S., (2008) Rev. Mod. Phys., 80, p. 1215. , RMPHAT 0034-6861 10.1103/RevModPhys.80.1215
  • Jördens, R., Strohmaier, N., Günter, K., Moritz, H., Esslinger, T., (2008) Nature (London), 455, p. 204. , NATUAS 0028-0836 10.1038/nature07244
  • Schneider, U., Hackermuller, L., Will, S., Best, T., Bloch, I., Costi, T.A., Helmes, R.W., Rosch, A., (2008) Science, 322, p. 1520. , SCIEAS 0036-8075 10.1126/science.1165449
  • Georges, A., Kotliar, G., Krauth, W., Rozenberg, M.J., (1996) Rev. Mod. Phys., 68, p. 13. , RMPHAT 0034-6861 10.1103/RevModPhys.68.13
  • Freericks, J.K., Zlatic, V., Exact dynamical mean-field theory of the Falicov-Kimball model (2003) Reviews of Modern Physics, 75 (4), pp. 1333-1382. , DOI 10.1103/RevModPhys.75.1333
  • Mahan, G.D., (1993) Many-Particle Physics, , Plenum, New York
  • Vojta, M., (2010) J. Low Temp. Phys., 161, p. 203. , JLTPAC 0022-2291 10.1007/s10909-010-0206-3
  • Biermann, S., De'Medici, L., Georges, A., Non-fermi-liquid behavior and double-exchange physics in orbital-selective mott systems (2005) Physical Review Letters, 95 (20), pp. 1-4. , http://oai.aps.org/oai/?verb=ListRecords&metadataPrefix= oai_apsmeta_2&set=journal:PRL:95, DOI 10.1103/PhysRevLett.95.206401, 206401
  • Jördens, R., (2010) Phys. Rev. Lett., 104, p. 180401. , PRLTAO 0031-9007 10.1103/PhysRevLett.104.180401
  • Stoferle, T., Moritz, H., Gunter, K., Kohl, M., Esslinger, T., Molecules of fermionic atoms in an optical lattice (2006) Physical Review Letters, 96 (3), p. 030401. , http://oai.aps.org/oai/?verb=ListRecords&metadataPrefix= oai_apsmeta_2&set=journal:PRL:96, DOI 10.1103/PhysRevLett.96.030401
  • Rozenberg, M.J., Chitra, R., Kotliar, G., (1999) Phys. Rev. Lett., 83, p. 3498. , PRLTAO 0031-9007 10.1103/PhysRevLett.83.3498
  • Werner, F., Parcollet, O., Georges, A., Hassan, S.R., Interaction-induced adiabatic cooling and antiferromagnetism of cold fermions in optical lattices (2005) Physical Review Letters, 95 (5), pp. 1-4. , http://oai.aps.org/oai/?verb=ListRecords&metadataPrefix= oai_apsmeta_2&set=journal:PRL:95, DOI 10.1103/PhysRevLett.95.056401, 056401

Citas:

---------- APA ----------
Winograd, E.A., Chitra, R. & Rozenberg, M.J. (2011) . Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices. Physical Review B - Condensed Matter and Materials Physics, 84(23).
http://dx.doi.org/10.1103/PhysRevB.84.233102
---------- CHICAGO ----------
Winograd, E.A., Chitra, R., Rozenberg, M.J. "Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices" . Physical Review B - Condensed Matter and Materials Physics 84, no. 23 (2011).
http://dx.doi.org/10.1103/PhysRevB.84.233102
---------- MLA ----------
Winograd, E.A., Chitra, R., Rozenberg, M.J. "Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices" . Physical Review B - Condensed Matter and Materials Physics, vol. 84, no. 23, 2011.
http://dx.doi.org/10.1103/PhysRevB.84.233102
---------- VANCOUVER ----------
Winograd, E.A., Chitra, R., Rozenberg, M.J. Orbital-selective crossover and Mott transitions in an asymmetric Hubbard model of cold atoms in optical lattices. Phys. Rev. B Condens. Matter Mater. Phys. 2011;84(23).
http://dx.doi.org/10.1103/PhysRevB.84.233102