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Application of Berry's phase to the effective mass of Bloch electrons

M J Rave1 and W C Kerr2

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Berry's phase, although well known since 1984, has received little attention among textbook authors of solid state physics. We attempt to address this lack by showing how the presence of the Berry's phase significantly changes a standard concept (effective mass) found in most solid state texts. Specifically, we show that the presence of a non-zero Berry curvature in Bloch systems makes the traditional concept of an inverse effective mass tensor M−1 problematic, since a routine application of Newton's second law leads to a circular definition. As a consequence, the related concept of cyclotron effective mass m* also requires modification. It is shown that m* is magnetic-field dependent in non-inversion symmetric systems. This has important ramifications for cyclotron resonance experiments, since such experiments yield m* and thereby purportedly give the components of M−1. This work represents a 'case study' in how Berry's phase effects can modify 'standard' solid-state topics in ways that students and instructors may find surprising.


PACS

03.65.Ta Foundations of quantum mechanics; measurement theory

03.65.Sq Semiclassical theories and applications

01.50.-i Educational aids

01.30.M- Textbooks

Subjects

Education and communication

Quantum information and quantum mechanics

Dates

Issue 1 (January 2010)

Received 12 August 2009, in final form 14 September 2009

Published 4 November 2009



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