New aspects of the metal-insulator transition in single-domain vanadium dioxide nanobeams.

Many strongly correlated electronic materials have a domain structure that greatly influences the bulk properties and obscures the fundamental properties of the homogeneous material. Nanoscale samples, on the other hand, can be smaller than the characteristic domain size, thus making it possible to explore these fundamental properties in detail. Here, we report new aspects of the metal-insulator transition, studied in single-domain vanadium dioxide nanobeams. We have observed supercooling of the metallic phase by 50 degrees C, an activation energy in the insulating phase that is consistent with the optical gap, and a connection between the metal-insulator transition and the equilibrium carrier density in the insulating phase. Our devices also provide a nanomechanical method for determining the transition temperature, enable measurements on individual metal-insulator interphase walls to be made, and allow general investigations of phase transitions in quasi-one-dimensional geometries.

[1]  A. Cavalleri,et al.  Ultra-Broadband Femtosecond Measurements of the Photo-Induced Phase Transition in VO2: From the Mid-IR to the Hard X-rays , 2006 .

[2]  J. Squier,et al.  Nonlinear optical microscopy analysis of ultrafast phase transformation in vanadium dioxide. , 2002, Optics letters.

[3]  Hongkun Park,et al.  Single-crystalline vanadium dioxide nanowires with rectangular cross sections. , 2005, Journal of the American Chemical Society.

[4]  C. N. Berglund,et al.  Optical Properties of VO2between 0.25 and 5 eV , 1968 .

[5]  D. N. Basov,et al.  Correlated metallic state of vanadium dioxide , 2006 .

[6]  Volker Eyert.  The metal-insulator transitions of VO2: A band theoretical approach , 2002 .

[7]  C. N. Berglund,et al.  Electronic Properties of V O 2 near the Semiconductor-Metal Transition , 1969 .

[8]  S. Minomura,et al.  The Effect of Pressure on the Metal-to-Insulator Transition in V2O4 and V2O3 , 1964 .

[9]  T. Niklewski,et al.  Accurate X-ray determination of the lattice parameters and the thermal expansion coefficients of VO2 near the transition temperature , 1979 .

[10]  Byung-Gyu Chae,et al.  Monoclinic and correlated metal phase in VO(2) as evidence of the Mott transition: coherent phonon analysis. , 2006, Physical review letters.

[11]  Hubert Jerominek,et al.  Vanadium oxide films for optical switching and detection , 1993 .

[12]  S Lupi,et al.  Evidence of a pressure-induced metallization process in monoclinic VO2. , 2007, Physical review letters.

[13]  T. Chin,et al.  Effect of Grain Curvature on Nano-Indentation Measurements of Thin Films , 2004 .

[14]  Pouget,et al.  Comment on "VO2: Peierls or Mott-Hubbard? A view from band theory" , 1994, Physical Review Letters.

[15]  D J Hilton,et al.  Enhanced photosusceptibility near Tc for the light-induced insulator-to-metal phase transition in vanadium dioxide. , 2007, Physical review letters.

[16]  T. M. Rice,et al.  Electron Localization Induced by Uniaxial Stress in Pure V O 2 , 1975 .

[17]  Allen,et al.  VO2: Peierls or Mott-Hubbard? A view from band theory. , 1994, Physical review letters.

[18]  Allen,et al.  Resistivity of the high-temperature metallic phase of VO2. , 1993, Physical review. B, Condensed matter.

[19]  H. Ehrke,et al.  Coherent structural dynamics and electronic correlations during an ultrafast insulator-to-metal phase transition in VO2. , 2007, Physical review letters.

[20]  J. P. Remeika,et al.  Structural Aspects of the Metal-Insulator Transitions in Cr-Doped V O 2 , 1972 .

[21]  Ahmed H. Zewail,et al.  4D Visualization of Transitional Structures in Phase Transformations by Electron Diffraction , 2007, Science.

[22]  Byung-Gyu Chae,et al.  Mott Transition in VO2 Revealed by Infrared Spectroscopy and Nano-Imaging , 2007, Science.

[23]  Nevill Mott,et al.  Metal-insulator transitions , 1974 .

[24]  Patrick Georges,et al.  Femtosecond laser excitation of the semiconductor‐metal phase transition in VO2 , 1994 .

[25]  Hongkun Park,et al.  Strain-induced self organization of metal-insulator domains in single-crystalline VO2 nanobeams. , 2006, Nano letters.

[26]  C. Mccombie,et al.  Solid-State Physics , 1965, Nature.

[27]  S. Luryi,et al.  Future trends in microelectronics : the nano millennium , 2002 .

[28]  Nevill Mott,et al.  Metal-insulator transitions , 1973 .

[29]  Hongkun Park,et al.  Current-driven phase oscillation and domain-wall propagation in WxV1-xO2 nanobeams. , 2007, Nano letters.

[30]  F. J. Morin,et al.  Oxides Which Show a Metal-to-Insulator Transition at the Neel Temperature , 1959 .

[31]  C. N. Berglund,et al.  Optical Properties of V O 2 between 0.25 and 5 eV , 1968 .