We investigate the effect of coupling between translational and internal degrees of freedom of composite quantum particles on their localization in a random potential. We show that entanglement between the two degrees of freedom weakens localization due to the upper bound imposed on the inverse participation ratio by purity of a quantum state. We perform numerical calculations for a two-particle system bound by a harmonic force in a 1D disordered lattice and a rigid rotor in a 2D disordered lattice. We illustrate that the coupling has a dramatic effect on localization properties, even with a small number of internal states participating in quantum dynamics.
Physical Review Letters
We acknowledge helpful discussions with W. G. Unruh and A. Rodriguez. F. S. is supported by European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Grant No. 754411. M. L. acknowledges support by the European Research Council (ERC) Starting Grant No. 801770 (ANGULON). W. H. Z. is supported by Department of Energy under the Los Alamos National Laboratory LDRD Program as well as by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division, Condensed Matter Theory Program. R. V. K. is supported by NSERC of Canada.
Suzuki F, Lemeshko M, Zurek WH, Krems RV. Anderson localization of composite particles. Physical Review Letters. 2021;127(16). doi:10.1103/physrevlett.127.160602
Suzuki, F., Lemeshko, M., Zurek, W. H., & Krems, R. V. (2021). Anderson localization of composite particles. Physical Review Letters. American Physical Society . https://doi.org/10.1103/physrevlett.127.160602
Suzuki, Fumika, Mikhail Lemeshko, Wojciech H. Zurek, and Roman V. Krems. “Anderson Localization of Composite Particles.” Physical Review Letters. American Physical Society , 2021. https://doi.org/10.1103/physrevlett.127.160602.
F. Suzuki, M. Lemeshko, W. H. Zurek, and R. V. Krems, “Anderson localization of composite particles,” Physical Review Letters, vol. 127, no. 16. American Physical Society , 2021.
Suzuki F, Lemeshko M, Zurek WH, Krems RV. 2021. Anderson localization of composite particles. Physical Review Letters. 127(16), 160602.
Suzuki, Fumika, et al. “Anderson Localization of Composite Particles.” Physical Review Letters, vol. 127, no. 16, 160602, American Physical Society , 2021, doi:10.1103/physrevlett.127.160602.