Magnetic Field-Induced Direct-Indirect Crossover in AlxGa1-xAs

Kirstin Alberi, Aleksej Mialitsin, Brian Fluegel, Scott Crooker, John Reno, Angelo Mascarenhas

Research output: Contribution to journalArticlepeer-review

1 Scopus Citations


We induce a direct-indirect band gap crossover in a single AlxGa1-xAs sample by using high magnetic fields. A reduction in the photoluminescence (PL) peak energy and onset of an asymmetric peak lineshape at magnetic fields >38 T result from a competition between the radiative recombination lifetime and the carrier migration time as the alloy becomes indirect. By analyzing the progression of the PL lineshape as the magnetic field is increased we show that the crossover is an alloy disorder-broadened, first-order phase transition.

Original languageAmerican English
Article number111201
Number of pages4
JournalApplied Physics Express
Issue number11
StatePublished - 2014

Bibliographical note

Publisher Copyright:
© 2014 The Japan Society of Applied Physics

NREL Publication Number

  • NREL/JA-5K00-62962


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