24884
Unlike Rashba split states in a 2D electron gas , these states are constrained by the band topology of the host insulator with topological properties similar to the typical topological surface state , and thereby offer an alternative candidate for spintronics usage .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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