Publication

Photoluminescence excitation spectra of disordered superlattices

Jean-Louis Staehli
1998
Journal Articles

Abstract

We investigate photoluminescence excitation (PLE) and selective photoluminescence (SPL) of ordered and disordered superlattices, showing that the coexistence of localized and extended states in disordered superlattices produces a dramatic dependence of the PLE spectra on the detection energy. We demonstrate that the PLE of disordered superlattices gives ambiguous information on joint density of states, and we use SPL in order to show that this effect is a consequence of the localization and of the lack of thermal equilibrium in disordered systems. (C) 1998 Elsevier Science B.V. All rights reserved.

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https://infoscience.epfl.ch/entities/publication/6f23a191-6479-43d0-be4b-7c0d07ff105e

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Jean-Louis Staehli
1998
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/6f23a191-6479-43d0-be4b-7c0d07ff105e

About this result

Related concepts (32)

Total order

In mathematics, a total order or linear order is a partial order in which any two elements are comparable. That is, a total order is a binary relation on some set , which satisfies the following for all and in : (reflexive). If and then (transitive). If and then (antisymmetric). or (strongly connected, formerly called total). Reflexivity (1.) already follows from connectedness (4.), but is required explicitly by many authors nevertheless, to indicate the kinship to partial orders.

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In mathematics, an ordered pair (a, b) is a pair of objects. The order in which the objects appear in the pair is significant: the ordered pair (a, b) is different from the ordered pair (b, a) unless a = b. (In contrast, the unordered pair {a, b} equals the unordered pair {b, a}.) Ordered pairs are also called 2-tuples, or sequences (sometimes, lists in a computer science context) of length 2. Ordered pairs of scalars are sometimes called 2-dimensional vectors.

Lexicographic order

In mathematics, the lexicographic or lexicographical order (also known as lexical order, or dictionary order) is a generalization of the alphabetical order of the dictionaries to sequences of ordered symbols or, more generally, of elements of a totally ordered set. There are several variants and generalizations of the lexicographical ordering. One variant applies to sequences of different lengths by comparing the lengths of the sequences before considering their elements.

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