Beating of the oscillations in the magnetocapacitance of a MODFET with Rasba spin-orbit interaction

The effect of Rasba spin-orbit interaction (SOI) on the magnetocapacitance of the 2DEG in a MODFET is investigated. We present calculations on the density of states (DOS) of the 2DEG in a MODFET under the influence of both Rasba SOI and weak two-dimensional periodic modulation. Adopting a Gaussian broadening of magnetic-field-dependent width, we present a simple expression for the DOS, valid for the relevant weak magnetic fields and modulation strengths. In the presence of Rasba SOI and for weak potential modulation strengths, a typical beating pattern of the magnetocapacitance oscillations is observed in the low magnetic filed range. A simple relation that predicts the positions of nodes in the beating patterns is obtained. The interplay between the SOI and the periodic potential modulation is discussed.

[1]  H. Ohno,et al.  Making nonmagnetic semiconductors ferromagnetic , 1998, Science.

[2]  G. E. Marques,et al.  Spin carrier dynamics under full spin-orbit coupling , 2005, Microelectron. J..

[3]  A. Gossard,et al.  Gate-controlled spin-orbit quantum interference effects in lateral transport. , 2002, Physical review letters.

[4]  Supriyo Datta,et al.  Spin-filter device based on the Rashba effect using a nonmagnetic resonant tunneling diode. , 2002, Physical review letters.

[5]  Hari Singh Nalwa,et al.  Handbook of nanostructured materials and nanotechnology , 2000 .

[6]  S. Sarma,et al.  Spintronics: Fundamentals and applications , 2004, cond-mat/0405528.

[7]  et al,et al.  Measurement of Time-Dependent CP-Violating Asymmetries in B0→ϕKS0, K+K-KS0, and η′KS0 Decays , 2003 .

[8]  M. Büttiker,et al.  Mesoscopic capacitance oscillations , 2006, cond-mat/0608417.

[9]  D. D. Awschalom,et al.  Spatial imaging of the spin Hall effect and current-induced polarization in two-dimensional electron gases , 2005, cond-mat/0506704.

[10]  S. Datta,et al.  Electronic analog of the electro‐optic modulator , 1990 .

[11]  D. Delagebeaudeuf,et al.  Metal-(n) AlGaAs-GaAs two-dimensional electron gas FET , 1982, IEEE Transactions on Electron Devices.

[12]  Daniel Loss,et al.  Datta-Das transistor with enhanced spin control , 2003 .

[13]  Magnetotransport in a two-dimensional electron gas in the presence of spin-orbit interaction , 2003, cond-mat/0301498.

[14]  Thomas A. Blake,et al.  Dissipationless Quantum Spin Current at Room Temperature , 2003 .

[15]  Smith,et al.  Direct measurement of the density of states of a two-dimensional electron gas. , 1985, Physical review. B, Condensed matter.

[16]  Mohamed Henini,et al.  Spin dynamics in (110)-oriented quantum wells , 2006, Microelectron. J..

[17]  Winkler,et al.  The effect of spin splitting on the metallic behavior of a two-dimensional system , 1999, Science.

[18]  E. Rashba,et al.  Oscillatory effects and the magnetic susceptibility of carriers in inversion layers , 1984 .

[19]  G. S. Kliros,et al.  Magnetocapacitance of a MODFET under two-dimensional periodic potential modulation , 2007, Microelectron. J..

[20]  LOCALIZED WAVEFUNCTIONS AND MAGNETIC BAND STRUCTURE FOR LATERAL SEMICONDUCTOR SUPERLATTICES , 2006, cond-mat/0609662.

[21]  D. D. Awschalom,et al.  Observation of the Spin Hall Effect in Semiconductors , 2004, Science.

[22]  O. Z. Karimov,et al.  High temperature gate control of quantum well spin memory. , 2003, Physical review letters.

[23]  D. Ritchie,et al.  Magnetization Measurements of High-Mobility Two-Dimensional Electron Gases , 2003 .

[24]  J. Schliemann,et al.  Nonballistic spin-field-effect transistor. , 2002, Physical review letters.

[25]  D. Awschalom,et al.  Electrical manipulation of spin -orbit coupling in semiconductor heterostructures , 2007 .

[26]  S. Datta,et al.  Evidence for spin splitting in InxGa1-xAs/In0.52Al0.48As heterostructures as B0 , 1989 .

[27]  J. Sinova,et al.  Experimental observation of the spin-Hall effect in a two-dimensional spin-orbit coupled semiconductor system. , 2004, Physical review letters.

[28]  T. Ando,et al.  Effect of localization on the hall conductivity in the two-dimensional system in strong magnetic fields , 1993 .

[29]  S. Novokshonov,et al.  Diffusive magnetotransport in a two-dimensional electron gas in the presence of Rashba spin-orbit interaction , 2006 .

[30]  Datta,et al.  Zero-field spin splitting in a two-dimensional electron gas. , 1990, Physical review. B, Condensed matter.

[31]  Inverse flux quantum periodicity of magnetoresistance oscillations in two-dimensional short-period surface superlattices , 2004, cond-mat/0402219.

[32]  Beating of oscillations in transport coefficients of a one-dimensionally periodically modulated two-dimensional electron gas in the presence of spin-orbit interaction , 2004, cond-mat/0412673.

[33]  D. Awschalom,et al.  Semiconductor spintronics and quantum computation , 2002 .

[34]  P. Ramvall,et al.  Zero-magnetic-field spin splittings in Al x Ga 1 − x As/GaAs heterojunctions , 1997 .

[35]  K. Klitzing,et al.  Density of states of GaAs-AlGaAs-heterostructures deduced from temperature dependent magnetocapacitance measurements , 1986 .