298 research outputs found
Bosonization Of A 2d Electron Gas In A Magnetic Field
No full textStarting from a Landau level description of a 2D fermion gas subject to a perpendicular uniform magnetic field, under the condition that there is a large integer number of filled Landau levels, we introduce a bosonization scheme for the low energy excitations of the system. We give an explicit construction of the fermion operator in terms of the bosons and show that the description of the elementary neutral excitations within a bosonic language provides a quadratic bosonic Hamiltonian for the interacting electron system which can be easily diagonalized. © Springer-Verlag 1997.1032279281MacDonald, A.H., (1989) The Quantum Hall Effect: A Perspective, , Dordrecht: Kluwer Academic(1990) The Quantum Hall Effect, 2nd Ed., , R.E. Prange, S.M. Girvin eds., New York: SpringerKarlhede, A., Kivelson, S.A., Sondhi, S.L., The Quantum Hall Effect: The article (1992) 9th Jerusalem Winter School on Theor. Phys., , Lectures presKallin, C., Halperin, B.I., (1984) Phys. Rev. B, 30, p. 5655Tomonaga, S., (1950) Prog. Theor. Phys. (Kyoto), 5, p. 544Pegg, D.T., Barnet, S.M., (1988) Europhysics Letters, 6, p. 483Susskind, L., Glogower, J., (1964) Physics, 1, p. 49Thirring, W., (1958) Ann. Phys. (N. Y.), 3, p. 91Luttinger, J.M., (1963) J. Math. Phys., 4, p. 1154Mattis, D., Lieb, E., (1965) J. Math. Phys., 6, p. 304Luther, A., (1975) Phys. Rev. B, 14, p. 2153Coleman, S., (1975) Phys. Rev. D., 11, p. 2088Haldane, F.D.M., (1981) J. Phys. C, 14, p. 2585H. Westfahl Jr., A.H. Castro Neto, A.O. Caldeira, cond-mat/9611004Mandelstam, S., (1975) Phys. Rev. D, 11, p. 3026Castro Neto, A.H., Fradkin, E., (1993) Phys. Rev. Lett., 72, p. 1393(1995) Phys. Rev. B, 51, p. 4048Lopez, A., Fradkin, E., (1991) Phys. Rev. B, 44, p. 5246(1992) Phys. Rev. Lett., 69, p. 2126(1993) Nucl. Phys. B, 33 C, p. 67Luther, A., (1979) Phys. Rev. B, 19, p. 320Haldane, F.D.M., Varenna Lectures (1992) (1992) Helv. Phys. Acta., 65, p. 152Houghton, A., Marston, B., (1993) Phys. Rev. B, 48, p. 7790Kwon, H.J., Houghton, A., Marston, B., (1995) Phys. Rev. B, 52, p. 800
DS_10.1177_0022034519897003 – Supplemental material for Inhibiting Corrosion of Biomedical-Grade Ti-6Al-4V Alloys with Graphene Nanocoating
No full textSupplemental material, DS_10.1177_0022034519897003 for Inhibiting Corrosion of Biomedical-Grade Ti-6Al-4V Alloys with Graphene Nanocoating by R. Malhotra, Y.M. Han, J.L.P. Morin, E.K. Luong-Van, R.J.J. Chew, A.H. Castro Neto, C.A. Nijhuis and V. Rosa in Journal of Dental Research</p
Renormalization-group approach to superconductivity: from weak to strong electron-phonon coupling
No full textWe present the numerical solution of the renormalization group (RG) equations derived in Tsai, Castro Neto, Shankar, et al. [Phys. Rev. B to appear], for the problem of superconductivity in the presence of both electron–electron and electron–phonon coupling at zero temperature. We study the instability of a Fermi liquid to a superconductor and the RG flow of the couplings in the presence of retardation effects and the crossover from weak to strong coupling. We show that our numerical results provide an ansatz for the analytic solution to the problem in the asymptotic limits of weak and strong coupling.First author draf
Current Flow In Biased Bilayer Graphene: Role Of Sublattices
No full textWe investigate here how the current flows over a bilayer graphene in the presence of an external electric field perpendicularly applied (biased bilayer). Charge density polarization between layers in these systems is known to create a layer pseudospin, which can be manipulated by the electric field. Our results show that current does not necessarily flow over regions of the system with higher charge density. Charge can be predominantly concentrated over one layer, while current flows over the other layer. We find that this phenomenon occurs when the charge density becomes highly concentrated over only one of the sublattices, as the electric field breaks layer and sublattice symmetries for a Bernal-stacked bilayer. For bilayer nanoribbons, the situation is even more complex, with a competition between edge and bulk effects for the definition of the current flow. We show that, in spite of not flowing trough the layer where charge is polarized to, the current in these systems also defines a controllable layer pseudospin.9012Topinka, M.A., Leroy, B.J., Shaw, S.E.J., Heller, E.J., Westervelt, R.M., Maranowski, K.D., Gossard, A.C., (2000) Science, 289, p. 2323. , SCIEAS 0036-8075Topinka, M.A., Leroy, B.J., Westervelt, R.M., Shaw, S.E.J., Fleischmann, R., Heller, E.J., Maranowski, K.D., Gossard, A.C., (2001) Nature (London), 410, p. 183. , NATUAS 0028-0836Castro Neto, A.H., Guinea, F., Peres, N.M.R., Novoselov, K.S., Geim, A.K., (2009) Rev. Mod. Phys., 81, p. 109. , RMPHAT 0034-6861Rycerz, A., Tworzydlo, J., Beenakker, C.W.J., (2007) Nat. Phys., 3, p. 172. , 1745-2473San-Jose, P., Prada, E., McCann, E., Schomerus, H., (2009) Phys. Rev. Lett., 102, p. 247204. , PRLTAO 0031-9007Akhmerov, A.R., Beenakker, C.W.J., (2007) Phys. Rev. Lett., 98, p. 157003. , PRLTAO 0031-9007Gunlycke, D., White, C.T., (2011) Phys. Rev. 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Nodal Liquid And S -wave Superconductivity In Transition Metal Dichalcogenides
No full textWe explore the physical properties of a unified microscopic theory for the coexistence of superconductivity and charge-density waves (CDWs) in two-dimensional transition-metal dichalcogenides. In the case of particle-hole symmetry, the elementary particles are Dirac fermions at the nodes of the charge density wave gap. When particle-hole symmetry is broken, electron (hole) pockets are formed around the Fermi surface. The superconducting ground state emerges from the pairing of nodal quasiparticles mediated by acoustic phonons via a piezoelectric coupling. We calculate several properties in the s -wave superconducting phase, including specific heat, ultrasound absorption, nuclear magnetic relaxation (NMR), and thermal and optical conductivities. In the case with particle-hole symmetry, the specific-heat jump at the transition deviates strongly from ordinary superconductors. The NMR response shows an anomalous anisotropy due to the broken time-reversal symmetry of the superconducting gap, induced by the triple CDW state. The loss of the lattice inversion center in the CDW phase leads to anomalous coherence factors in the optical conductivity and to the appearance of an absorption edge at the optical gap energy. In addition, optical and thermal conductivities display anomalous peaks in the infrared when particle-hole symmetry is broken. © 2005 The American Physical Society.7118Withers, R.L., Wilson, J.A., (1986) J. Phys. C, 19, p. 4809. , JPSOAW 0022-3719 10.1088/0022-3719/19/25/005Wilson, J.A., Yoffe, A.D., (1969) Adv. Phys., 18, p. 193. , ADPHAH 0001-8732Wilson, J.A., Disalvo, F.J., Mahajan, S., (1975) Adv. Phys., 24, p. 117. , ADPHAH 0001-8732Tidman, J.P., Singh, O., Curzon, A.E., (1974) Philos. Mag., 30, p. 1191. , PHMAA4 0031-8086Whitney, D.A., Fleming, R.M., Coleman, R.V., (1977) Phys. Rev. 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Third edge for a graphene nanoribbon: A tight-binding model calculation
No full textThe electronic and transport properties of an extended linear defect embedded in a zigzag nanoribbon of realistic width are studied within a tight-binding model approach. Our results suggest that such a defect profoundly modifies the properties of the nanoribbon, introducing new conductance quantization values and modifying the conductance quantization thresholds. The linear defect along the nanoribbon behaves as an effective third edge of the system, which shows a metallic behavior, giving rise to new conduction pathways that could be used in nanoscale circuitry as a quantum wire. © 2011 American Physical Society.8315Novoselov, K.S., Geim, A.K., Morozov, S.V., Jiang, D., Zhang, Y., Dubonos, S.V., Grigorieva, I.V., Firsov, A.A., Electric field in atomically thin carbon films (2004) Science, 306 (5696), pp. 666-669. , DOI 10.1126/science.1102896Castro Neto, A.H., Guinea, F., Peres, N.M.R., Novoselov, K.S., Geim, A.K., (2009) Rev. Mod. 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Domain Wall Dynamics In Id Quantum Antiferromagnets
No full textThe problem, of dissipative motion of domain walls (DW) in the case of tetramethyl ammonium manganese chloride (TMMC) is studied as a function of the external magnetic field, and the temperature. Two specific situations are analyzed separately; the first, above the transition temperature TN, in which the classical motion of the spin degree of freedom may be described by a sine-Gordon equation of motion and, the second, below TN, in which the system may be described by a double sine-Gordon equation of motion. The existence of a dissipative regime for the DW motion and its influence on the dynamical structure factor - which might be experimentally detected - are investigated. © 2001 Elsevier Science B.V. All rights reserved.226-230PART I510511Mikeska, H.J., (1979) J. Magn. Magn. Mater., 13, p. 35Krumhansl, J.A., Schrieffer, J.R., (1975) Phys. Rev. B, 11, p. 3535Regnault, L.P., Boucher, J.P., Rossat-Mignod, J., Renard, J.P., Boillot, J., Stirling, W.O., (1982) J. Phys. C, 15, p. 1261Castro Neto, A.H., Caldeira, A.O., (1993) Phys. Rev. E, 48, p. 4037Despósito, M.A., Villares Ferrer, A., Caldeira, A.O., Castro Neto, A.H., Phys. Rev. B, , accepted for publicationHolyst, J.A., (1989) Z. Phys. B, 74, p. 34
Additional Levels Between Landau Bands Due To Vacancies In Graphene: Towards Defect Engineering
No full textWe describe the effects of vacancies on the electronic properties of a graphene sheet in the presence of a perpendicular magnetic field: from a single defect to an organized vacancy lattice. An isolated vacancy is the minimal possible inner edge, showing an antidotlike behavior, which results in an extra level between consecutive Landau levels. Two close vacancies may couple to each other, forming a vacancy molecule tuned by the magnetic field. We show that a vacancy lattice introduce an extra band in between Landau levels with localization properties that could lead to extra Hall resistance plateaus. © 2008 The American Physical Society.7812Novoselov, K.S., Geim, A.K., Morozov, S.V., Jiang, D., Zhang, Y., Dubonos, S.V., Grigorieva, I.V., Firsov, A.A., (2004) Science, 306, p. 666. , SCIEAS 0036-8075 10.1126/science.1102896Geim, A.K., Novoselov, K.S., (2007) Nat. Mater., 6, p. 183. , NMAACR 1476-1122 10.1038/nmat1849Castro Neto, A.H., Guinea, F., Peres, N.M.R., Novoselov, K.S., Geim, A.K., arXiv:07091163 (unpublished)Novoselov, K.S., Geim, A.K., Morozov, S.V., Jiang, D., Katsnelson, M.I., Grigorieva, I.V., Dubonos, S.V., Firsov, A.A., (2005) Nature (London), 438, p. 197. , NATUAS 0028-0836 10.1038/nature04233Zhang, Y., Tan, Y.-W., Stormer, H.L., Kim, P., (2005) Nature (London), 438, p. 201. , NATUAS 0028-0836 10.1038/nature04235Hjort, M., Stafstrom, S., (2000) Phys. Rev. B, 61, p. 14089. , PRBMDO 0163-1829 10.1103/PhysRevB.61.14089Pereira, V.M., Guinea, F., Lopes Dos Santos, J.M.B., Peres, N.M.R., Castro Neto, A.H., (2006) Phys. Rev. Lett., 96, p. 036801. , PRLTAO 0031-9007 10.1103/PhysRevLett.96.036801Pereira, V.M., Lopes Dos Santos, J.M.B., Castro Neto, A.H., (2008) Phys. Rev. B, 77, p. 115109. , PRBMDO 0163-1829 10.1103/PhysRevB.77.115109Palacios, J.J., Fernández-Rossier, J., Brey, L., (2008) Phys. Rev. B, 77, p. 195428. , PRBMDO 0163-1829 10.1103/PhysRevB.77.195428Hashimoto, A., Suenaga, K., Gloter, A., Urita, K., Iijima, S., (2004) Nature (London), 430, p. 870. , NATUAS 0028-0836 10.1038/nature02817Novoselov, K.S., Jiang, Z., Zhang, Y., Morozov, S.V., Stormer, H.L., Zeitler, U., Maan, J.C., Geim, A.K., (2007) Science, 315, p. 1379. , SCIEAS 0036-8075 10.1126/science.1137201Peres, N.M.R., Guinea, F., Castro Neto, A.H., (2006) Phys. Rev. B, 73, p. 125411. , PRBMDO 0163-1829 10.1103/PhysRevB.73.125411Eisenstein, J.P., Stormer, H.L., Narayanamurti, V., Cho, A.Y., Gossard, A.C., Tu, C.W., (1985) Phys. Rev. Lett., 55, p. 875. , PRLTAO 0031-9007 10.1103/PhysRevLett.55.875Gerhardts, R.R., Gudmundsson, V., (1986) Phys. Rev. B, 34, p. 2999. , PRBMDO 0163-1829 10.1103/PhysRevB.34.2999Xie, X.C., Li, Q.P., Das Sarma, S., (1990) Phys. Rev. B, 42, p. 7132. , PRBMDO 0163-1829 10.1103/PhysRevB.42.7132Li, G., Andrei, E.Y., (2007) Nat. Phys., 3, p. 623. , ZZZZZZ 1745-2473Li, G., Luican, A., Andrei, E.Y., arXiv:0803.4016 (unpublished)Ponomarenko, L.A., Schedin, F., Katsnelson, M.I., Yang, R., Hill, E.W., Novoselov, K.S., Geim, A.K., (2008) Science, 320, p. 356. , SCIEAS 0036-8075 10.1126/science.1154663Stampfer, C., Gttinger, J., Molitor, F., Graf, D., Ihn, T., Ensslin, K., (2008) Appl. Phys. Lett., 92, p. 012102. , APPLAB 0003-6951 10.1063/1.2827188Tapasztó, L., Dobrik, G., Lambin, P., Biró, L.P., (2008) Nat. Nanotechnol., 3, p. 397. , NNAABX 1748-3387 10.1038/nnano.2008.149Giesbers, A.J.M., Zeitlera, U., Neubeck, S., Freitag, F., Novoselov, K.S., Maan, J.C., (2008) Solid State Commun., 147, p. 366. , 0038-1098Pedersen, T.G., Flindt, C., Pedersen, J., Mortensen, N.A., Jauho, A.P., Pedersen, K., (2008) Phys. Rev. Lett., 100, p. 136804. , PRLTAO 0031-9007 10.1103/PhysRevLett.100.136804Pereira, A.L.C., Schulz, P.A., (2008) Phys. Rev. B, 77, p. 075416. , PRBMDO 0163-1829 10.1103/PhysRevB.77.075416Lee, G.-D., Wang, C.Z., Yoon, E., Hwang, N.-M., Kim, D.-Y., Ho, K.M., (2005) Phys. Rev. Lett., 95, p. 205501. , PRLTAO 0031-9007 10.1103/PhysRevLett.95.205501Sivan, U., Imry, Y., Hartzstein, C., (1989) Phys. Rev. B, 39, p. 1242. , PRBMDO 0163-1829 10.1103/PhysRevB.39.1242Thouless, D.J., (1974) Phys. Rep., 13, p. 93. , PRPLCM 0370-1573 10.1016/0370-1573(74)90029-5Zhang, Y., Jiang, Z., Small, J.P., Purewal, M.S., Tan, Y.-W., Fazlollahi, M., Chudow, J.D., Kim, P., (2006) Phys. Rev. Lett., 96, p. 136806. , PRLTAO 0031-9007 10.1103/PhysRevLett.96.13680
Mobility And Diffusion Of A Particle Coupled To A Luttinger Liquid
No full textWe study the mobility of a particle coupled to a one-dimensional interacting fermionic system, namely, a Luttinger liquid. We bosonize the Luttinger liquid and find the effective interaction between the particle and the bosonic system. We show that the dynamics of this system is completely equivalent to the acoustic polaron problem where the interaction has purely electronic origin. This problem has a zero-mode excitation, or soliton, in the strong-coupling limit, which corresponds to the the formation of a polarization cloud due to the fermion-fermion interaction around the particle. We find that, due to the scattering of the residual bosonic modes, the soliton has a finite mobility and diffusion coefficient at finite temperatures that depend on the fermion-fermion interaction. We show that at low temperatures the mobility and the diffusion coefficient are proportional to T-4 and T5, respectively, and at high temperatures the mobility vanishes as T-1 while the diffusion increases as T. © 1994 The American Physical Society.5074863486
Excitonic collapse in semiconducting transition-metal dichalcogenides
No full text10.1103/PhysRevB.88.195437Physical Review B - Condensed Matter and Materials Physics8819-PRBM
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