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Abstract
We study potential and electron density depth profiles in accumulation, inversion, and depletion layers in crystals with a large and nonlinear dielectric response such as SrTiO3. We describe the lattice dielectric response using the Landau-Ginzburg free energy expansion. In accumulation and inversion layers we arrive at new nonlinear dependencies of the width d of the electron gas on an applied electric field D0. Particularly important is the predicted electron density profile of accumulation layers (including the LaAlO3/SrTiO3 interface) n(x) (x+d)-12/7, where d D0-7/5. We compare this profile with available data and find satisfactory agreement. For a depletion layer we find an unconventional nonlinear dependence of the capacitance on voltage. We also evaluate the role of spatial dispersion in the dielectric response by adding a gradient term to the Landau-Ginzburg free energy.
Original language | English (US) |
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Article number | 115303 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 91 |
Issue number | 11 |
DOIs | |
State | Published - Mar 6 2015 |
Bibliographical note
Publisher Copyright:© 2015 American Physical Society.
How much support was provided by MRSEC?
- Primary
Reporting period for MRSEC
- Period 1
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MRSEC IRG-2: Sustainable Nanocrystal Materials
Kortshagen, U. R., Aydil, E. S., Campbell, S. A., Francis, L. F., Haynes, C. L., Hogan, C., Mkhoyan, A., Shklovskii, B. I. & Wang, X.
9/1/98 → …
Project: Research project
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