University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Friday, April 12th 2019
2:30 pm:
CM Journal Club in PAN 110
Speaker: M. Kiefer-Emmanouilidis
Subject: Current reversals in the Bose-Hubbard chain with local particle loss
Note change of time and day, this week only.

Many-body interactions lead to unexpected effects in the open
Bose-Hubbard model. When the model is subjected to local loss, particle
currents are induced. Away from the dissipative site the currents start
to reverse their direction at intermediate and long times. This leads
to a metastable state with a total particle current pointing away from
the dissipative site. We studied the model numerically by combining
a quantum trajectory approach with a density-matrix renormalization
group scheme. An alternative equation of motion approach based on
an effective fermion model shows that the reversal of currents can be
understood qualitatively by the creation of holon-doublon pairs at the
edge of the region of reduced particle density. The doublons are then
able to escape while the holes move towards the dissipative site.

Some keywords for the talk:
1D quantum chains, Bose-Hubbard model, Markovian open systems,
Matrix product states/ Density Matrix Renormalization Group
, Metastable states, Lindblad master equation

Papers and readings:
His results have been published on
M. Kiefer-Emmanouilidis & J. Sirker, Current reversals and metastable states in the infinite Bose-Hubbard chain with local particle loss. PhysRevA.96.063625 (2017).

The following books give a quite good introduction to open systems:
1. Breuer, Heinz-Peter; Petruccione, F. (2002). The Theory of Open Quantum Systems. Oxford University Press
2. Carmichael, Howard. An Open Systems Approach to Quantum Optics
3. Further there is a quite good but mathematically summary here

The weekly calendar is also available via subscription to the physics-announce mailing list, and by RSS feed.