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Exploring Alloy Disorder in Diluted Magnetic Semiconductors with a 100T Multi-Shot Magnet

This study presents the first experiments conducted using the innovative 100T Multi-Shot magnet, which permits non-destructive access to ultra-high magnetic fields for advanced research. The long pulse duration enables high-resolution optical spectroscopy. We investigate the field-tunable alloy disorder potential in a quantum well of Zn70Cd22Mn08Se. The observed changes in magnetic alloy disorder, revealed by photoluminescence linewidth measurements, demonstrate a notable increase in linewidth with rising magnetic fields, aligning with predictions from a local bandgap model.

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Exploring Alloy Disorder in Diluted Magnetic Semiconductors with a 100T Multi-Shot Magnet

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  1. 63.9 T 67.8 T 71.1 T 74.5 T 78.2 T 81.7 T 84.7 T 88.9 T PL linewidth (meV) Calculated linewidth (norm.) First Experiments in the 100T Multi-Shot Magnet: Tuning Alloy Disorder in Diluted Magnetic Semiconductors Scott A. Crooker & Nitin Samarth; Applied Physics Letters90, 102109 (2007) NHMFL-LANL & Pennsylvania State University The new 100T “Multi-Shot” magnet allows non-destructive access to ultrahigh magnetic fields. Importantly, its relatively long pulse duration permits high-resolution optical spectroscopy. The field profiles from eight separate pulses are shown in at left. Zn.70Cd.22Mn.08Se quantum well In the first experiments performed in the 100T Multi-Shot magnet , we studied the field-tunable alloy disorder potential in a single diluted magnetic semiconductor quantum well. As spins align, the magnetic alloy disorder potential changes. This disorder is directly revealed by the photoluminescence (PL) linewidth, G. See raw PL data at right. 60T Long-Pulse 100T Multi-Shot Above 70 T, we observe that G markedly increases, in qualitative agreement with a simple “local-bandgap” model of compositional alloy disorder (dotted line shows the theoretically-predicted linewidth).

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