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From orbital magnetism to bulk-edge correspondence
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abstract
By extending the gauge covariant magnetic perturbation theory to operators defined on half-planes, we prove that for $2d$ random ergodic magnetic Schr\"odinger operators, the zero-temperature bulk-edge correspondence can be obtained from a general bulk-edge duality at positive temperature involving the bulk magnetization and the total edge current. Our main result is encapsulated in a formula, which states that the derivative of a large class of bulk partition functions with respect to the external constant magnetic field, equals the expectation of a corresponding edge distribution function of the velocity component which is parallel to the edge. Neither spectral gaps, nor mobility gaps, nor topological arguments are required. The equality between the bulk and edge indices, as stated by the conventional bulk-edge correspondence, is obtained as a corollary of our purely analytical arguments by imposing a gap condition and by taking a ``zero-temperature" limit.
Forward citations
Cited by 2 Pith papers
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Generalized bulk-interface correspondence for non-quantized spin transport
For tight-binding electron systems with nonconserved spin, the difference of bulk spin conductances across an interface equals the interface spin-drift conductance plus the interface spin-torque conductance.
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Bulk-edge correspondence in finite photonic structure
For finite 2D photonic structures, the per-area edge circulation index converges to the bulk gap Chern number as the domain grows, conditional on unproved Green function bounds.
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