Materia-seminarios

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materia-seminarios@onsager.ugr.es

February 2019

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Recordatorio de Seminario
by Daniel Manzano 21 Feb '19

21 Feb '19

El grupo de Física Estadística y de los Sistemas Complejos les invita a asistir al siguiente seminario. Título: Quantum transport on lattices Ponente: Daniel Manzano. Resumen: Quantum transport in lattices is a major field of study nowadays. It has been probed that a lattice composed by harmonic oscillators connected to two thermal baths at different temperatures behaves ballistically in any dimension [1]. On the other hand, if the lattice is composed by spins it is ballistic only in the one-dimensional case [2, 3]. In the simplest two-dimensional spin lattice, a ladder, it has been numerically probed the existence of both ballistic and non-ballistic channels [4]. In this talk, I will show that both fermionic and bosonic uniform d-dimensional lattices can be reduced to a set of independent one-dimensional chains [5]. This reduction leads to the expression for ballistic energy fluxes in uniform fermionic and bosonic lattices. By the use of the Jordan-Wigner transformation, we can extend our analysis to spin lattices, proving the coexistence of both ballistic and non-ballistic subspaces in any dimension and for any system size. We then relate the nature of transport to the number of excitations in the homogeneous spin lattice, indicating that a single excitation always propagates ballistically and that the non-ballistic behaviour of uniform spin lattices is a consequence of the interaction between different excitations. References: [1] A. Asadian, D. Manzano, M. Tiersch, and H.J. Briegel. Phys. Rev. E 87, 012109 (2013) [2] M. Znidaric. Phys. Rev. E 83, 011108 (2011). [3] D. Manzano, M. Tiersch, A. Asadian, and H.J. Briegel. Phys. Rev. E 86, 061118 (2012). [4] M. Znidaric. Phys. Rev. Lett. 110, 070602 (2013). [5] D. Manzano, C. Chuang, and J. Cao. New J. Phys. 18, 043044 (2016). Día y hora: Viernes 22 de Febrero a las 12:00 Lugar: Aula de informática. Departamento de Física de la Materia. Planta baja del edificio de Física. Facultad de Ciencias. https://ic1.ugr.es/eventos/wp/seminariosinternos16/2019/02/13/quantum-trans… <https://ic1.ugr.es/eventos/wp/seminariosinternos16/2019/02/13/quantum-trans…> --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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Seminario: "Quantum transport on lattices"
by Daniel Manzano 13 Feb '19

13 Feb '19

Día y hora: Viernes 22 de Febrero a las 12:00 Lugar: Aula de informática. Departamento de Física de la Materia. Planta baja del edificio de Física. Facultad de Ciencias. Ponente: Daniel Manzano. Título: Quantum transport on lattices Abstract: Quantum transport in lattices is a major field of study nowadays. It has been probed that a lattice composed by harmonic oscillators connected to two thermal baths at different temperatures behaves ballistically in any dimension [1]. On the other hand, if the lattice is composed by spins it is ballistic only in the one-dimensional case [2, 3]. In the simplest two-dimensional spin lattice, a ladder, it has been numerically probed the existence of both ballistic and non-ballistic channels [4]. In this talk, I will show that both fermionic and bosonic uniform d-dimensional lattices can be reduced to a set of independent one-dimensional chains [5]. This reduction leads to the expression for ballistic energy fluxes in uniform fermionic and bosonic lattices. By the use of the Jordan-Wigner transformation, we can extend our analysis to spin lattices, proving the coexistence of both ballistic and non-ballistic subspaces in any dimension and for any system size. We then relate the nature of transport to the number of excitations in the homogeneous spin lattice, indicating that a single excitation always propagates ballistically and that the non-ballistic behaviour of uniform spin lattices is a consequence of the interaction between different excitations. References: [1] A. Asadian, D. Manzano, M. Tiersch, and H.J. Briegel. Phys. Rev. E 87, 012109 (2013) [2] M. Znidaric. Phys. Rev. E 83, 011108 (2011). [3] D. Manzano, M. Tiersch, A. Asadian, and H.J. Briegel. Phys. Rev. E 86, 061118 (2012). [4] M. Znidaric. Phys. Rev. Lett. 110, 070602 (2013). [5] D. Manzano, C. Chuang, and J. Cao. New J. Phys. 18, 043044 (2016). Un saludo, --------------------------------------------------------------------------------- Daniel Manzano Electromagnetism and Condensed Matter Department University of Granada Facultad de Ciencias, Av. Fuentenueva s/n Granada 18071, Spain Phone: +34 958241000 Ext: 20569 http://ic1.ugr.es/manzano/ <http://ic1.ugr.es/manzano/>

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