Zobrazeno 1 - 10
of 718
pro vyhledávání: '"Jarrell M"'
Autor:
Östlin, A., Zhang, Y., Terletska, H., Beiuseanu, F., Popescu, V., Byczuk, K., Vitos, L., Jarrell, M., Vollhardt, D., Chioncel, L.
Publikováno v:
Phys. Rev. B 101, 014210 (2020)
By merging single-site typical medium theory with density functional theory we introduce a self-consistent framework for electronic structure calculations of materials with substitutional disorder which takes into account Anderson localization. The s
Externí odkaz:
http://arxiv.org/abs/1911.02393
Publikováno v:
Phys. Rev. B 99, 134203, 2019
We report the development and application of a new method for carrying out computational investigations of the effects of mass and force-constant (FC) disorder on phonon spectra. The method is based on the recently developed typical medium dynamical
Externí odkaz:
http://arxiv.org/abs/1904.05324
Publikováno v:
Physical Review B 96.1 (2017): 014203
The effect of disorder on lattice vibrational modes has been a topic of interest for several decades. In this work, we employ a Green's function based approach, namely the dynamical cluster approximation (DCA), to investigate phonons in mass disorder
Externí odkaz:
http://arxiv.org/abs/1806.00282
Autor:
Zhang, Yi, Nelson, R., Tam, K. -M., Ku, W., Yu, U., Vidhyadhiraja, N. S., Terletska, H., Moreno, J., Jarrell, M., Berlijn, T.
Publikováno v:
Phys. Rev. B 98, 174204 (2018)
Intermediate band semiconductors hold the promise to significantly improve the efficiency of solar cells, but only if the intermediate impurity band is metallic. We apply a recently developed first principles method to investigate the origin of elect
Externí odkaz:
http://arxiv.org/abs/1805.05276
Publikováno v:
Phys. Rev. E 98, 053305 (2018)
Unsupervised machine learning methods are used to identify structural changes using the melting point transition in classical molecular dynamics simulations as an example application of the approach. Dimensionality reduction and clustering methods ar
Externí odkaz:
http://arxiv.org/abs/1802.10127
Publikováno v:
Phys. Rev. B 98, 184206 (2018)
We study the Bose-Hubbard model in the presence of on-site disorder in the canonical ensemble and conclude that the local density of the Bose glass phase behaves differently at incommensurate filling than it does at commensurate one. Scaling of the s
Externí odkaz:
http://arxiv.org/abs/1711.06310
Publikováno v:
Phys. Rev. B 95, 144208 (2017)
The mean-field theory for disordered electron systems without interaction is widely and successfully used to describe equilibrium properties of materials over the whole range of disorder strengths. However, it fails to take into account the effects o
Externí odkaz:
http://arxiv.org/abs/1701.03875
Publikováno v:
Phys. Rev. B 95, 134204 (2017)
The typical medium dynamical cluster approximation (TMDCA) is reformulated in the language of multiple scattering theory to make possible first principles calculations of the electronic structure of substitutionally disordered alloys including the ef
Externí odkaz:
http://arxiv.org/abs/1612.05611
Publikováno v:
Phys. Rev. B 94, 144514 (2016)
Ring-exchange interactions have been proposed as a possible mechanism for a Bose-liquid phase at zero temperature, a phase that is compressible with no superfluidity. Using the Stochastic Green Function algorithm (SGF), we study the effect of these i
Externí odkaz:
http://arxiv.org/abs/1607.04189
Autor:
Zhang, Yi, Nelson, R., Siddiqui, Elisha, Tam, K. -M., Yu, U., Berlijn, T., Ku, W., Vidhyadhiraja, N. S., Moreno, J., Jarrell, M.
Publikováno v:
Phys. Rev. B 94, 224208 (2016)
We generalize the multiband typical medium dynamical cluster approximation and the formalism introduced by Blackman, Esterling and Berk so that it can deal with localization in multiband disordered systems with both diagonal and off-diagonal disorder
Externí odkaz:
http://arxiv.org/abs/1607.02778