Calendar of Events

Speaker: J. M. P. Carmelo (Boston University, Massachusetts Institute of Technology and Center of Physics of University of Minho and University of Porto)

We study the one-electron spectral properties of a class of one-dimensional correlated systems in which the interactions have finite ranges. We employ a mobile quantum impurity scheme that describes the interactions of the fractionalized particle excitations at energies above the standard Tomonga-Luttinger liquid limit. For the class of interacting systems under consideration, the phase shifts induced by the impurity are shown to describe universal properties of the one-particle spectral function. Our theoretical framework relies on a controlled modification of the phase shifts associated with a pseudofermion dynamical theory for one-dimensional interacting electron systems in which the interactions have short ranges [1,2]. We find the explicit forms in terms of the corresponding renormalized phase shifts for the momentum dependent exponents that control the behavior of the spectral function near and at the (k,?)-plane singularities where most of the spectral weight is located. The universality arises because the line shape near the singularities is independent of the short-distance part of the interaction potentials. We apply the theory to the angle-resolved photo-electron spectroscopy (ARPES) in the highly one-dimensional twin grain boundaries of molybdenum diselenide MoSe2 [3,4] and bismuth-induced anisotropic structure on indium antimonide Bi/InSb(001) [5]. Our theoretical predictions agree quantitatively with both (i) the experimental value found in such systems for the exponent ? that controls the suppression of the density of states at very small excitation energy ? and (ii) the location in the (k, ?) plane of the experimentally observed high-energy peaks in the ARPES momentum and energy distributions.

1. J. M. P. Carmelo and P. D. Sacramento, Physics Reports 749, 1 (2018).
2. T. C'ade'z, S. Nemati, and J. M. P. Carmelo, Nuclear Physics B 942, 45 (2019).
3. Y. Ma, H. C. Diaz, J. Avila, C. Chen, V. Kalappattil, R. Das, M.-H. Phan, T. C'ade'z, J. M. P. Carmelo, M. C. Asensio, and M. Batzill, Nature Communications 8, 14231 (2017).
4. T. C'ade'z, L. Li, E. V. Castro, and J. M. P. Carmelo, Physical Review B 99, 155109 (2019).
5. J. M. P. Carmelo, T. C' ade'z, Y. Ohtsubo, S.-i Kimura, and D. K. Campbell, arXiv:1801.07732

Host: Natan Andrei