A scanning tunneling microscope (STM) was used to image simultaneously the atomic lattice and the... more A scanning tunneling microscope (STM) was used to image simultaneously the atomic lattice and the charge density wave (CDW) superstructure in tantalum disulfide (1T-TaS[sub 2]) over the temperature range of 370-77K. In the lowest temperature (commensurate) phase, present below 180K, the CDW is at an angle of 13.9[degrees] relative to the lattice and is uniformly commensurate. In the incommensurate phase, present above 353K, the CDW is aligned with the lattice. 1T-TaS[sub 2] exhibits two other phases; the triclinic (T) phase which is present between 223K and 283K upon warming the sample, and the nearly-commensurate (NC) phase which is present between 353K and 180K upon cooling the sample and between 283K and 353K upon warming the sample. In both phases, discommensurate models where the CDW is arranged in small commensurate domains have been proposed. In the NC phase the CDW is rotated between 10[degrees] and 12.5[degrees] relative in the atomic lattice. Such a rotated CDW would creat...
2003 Third IEEE Conference on Nanotechnology, 2003. IEEE-NANO 2003., 2003
We have used ultrahigh vacuum scanning tunneling microscopy (UHV STM) to study single-walled carb... more We have used ultrahigh vacuum scanning tunneling microscopy (UHV STM) to study single-walled carbon nanotubes (SWNTs) supported by a hydrogen-terminated Si(100)-2×1 surface. Two distinct methods were used in the deposition of SWNTs. The first is an ex situ solution-based scheme, while the second involves direct mechanical transfer in situ. The UHV-prepared Si(100)-2×1:H surface is highly robust to ambient exposure, resulting
Nanoscale patterning of the Si(100)-2x1:H surface with the UHV-STM [1] is used to selectively mod... more Nanoscale patterning of the Si(100)-2x1:H surface with the UHV-STM [1] is used to selectively modify the Si substrate acting as a semiconducting support for isolated single-walled carbon nanotubes (SWNTs) deposited via dry contact transfer (DCT) [2]. By desorbing H at the SWNT-Si interface, we can mechanically stabilize SWNTs that initially were only weakly coupled to the Si surface and thus highly sensitive to STM tip induced perturbations. Moreover, on the degenerately doped n-type H-Si(100) surface, the presence of negatively charged Si dangling ponds patterned in close proximity to a semiconducting SWNT decreases the magnitude of the substrate voltage required for the onset of filled states conduction through the SWNT. Our results suggest new opportunities for engineering -- on the sub-nm scale -- both the mechanical and electronic properties of SWNTs integrated with semiconductor platforms. [1] J.W. Lyding et al., APL 64, 2010 (1994). [2] P.M. Albrecht and J.W. Lyding, APL 83, 5029 (2003).
... POLYMERIC MATERIALS CONSTRUCTED FROM METALLOPHTHALOCYANINES TAMOTSU INABEla, JOSEPH F. LOMAXl... more ... POLYMERIC MATERIALS CONSTRUCTED FROM METALLOPHTHALOCYANINES TAMOTSU INABEla, JOSEPH F. LOMAXla, JOSEPH W. LYDINGlb ... WJ Pietro, TJ Marks and MA Ratner, Mol. Cryst. Liq. ... PJ Nigrey, D. MacInnes, Jr., DP Nairns, AG MacDiarmid and AJ Heeger, J ...
A cryogenic UHV scanning tunneling microscope has been used to study the electron stimulated deso... more A cryogenic UHV scanning tunneling microscope has been used to study the electron stimulated desorption of hydrogen and deuterium from Si(100) surfaces at 11 K. A strong isotope effect is observed, as seen previously at room temperature. Above ∼5 eV, the desorption yields ...
An LC resonator using a superconducting MgB2 thin film was fabricated, and its quality factor was... more An LC resonator using a superconducting MgB2 thin film was fabricated, and its quality factor was measured. The LC resonator was formed by an MgB2 thin film in a loop shape and thin film capacitors having an Au/AlN/MgB2 structure. The etching process of MgB2 thin film was optimized to improve the yield of Au/AlN/MgB2 thin film capacitor. Experimental results indicate that quality factors Q=760–1570 for frequency of 560–680MHz at 4.2K. The quality factor of an MgB2 LC resonator increased with frequency. These results suggest that the MgB2 thin film is promising for microwave device applications.
Inc. The scanning tunneling microscope (STM) is a locally constructed, programmable, ultrahigh va... more Inc. The scanning tunneling microscope (STM) is a locally constructed, programmable, ultrahigh vacuum instrument for atomic level imaging and surface modi-fication. Our goal was not to control all three instruments simultaneously but rather to demonstrate that our uni-fied virtual ...
Use of single-walled carbon nanotubes (SWNTs) in industry compatible device applications requires... more Use of single-walled carbon nanotubes (SWNTs) in industry compatible device applications requires top-down control of SWNT electronic type. Therefore, we develop a technique for SWNT electronic separation, increasing the relative distribution of metallic SWNTs in solution by ...
Abstract: This program demonstrated the first compatible resonant tunneling diodes (RTD) for inte... more Abstract: This program demonstrated the first compatible resonant tunneling diodes (RTD) for integration with CMOS (complementary metal oxide semiconductor) technology and designed circuits to exploit and evaluate the speed-power advantage of integrated RTD and CMOS devices. The first Si-based resonant interband tunnel diodes were demonstrated with peak current density greater than 10 (exp 4) A/sq cm; peak-to-valley current ratio exceeding 2 was achieved at room temperature. The SiO2/Si/SiO2 RTD was studied extensively in a ...
4th IEEE Conference on Nanotechnology, 2004., 2004
A hydrogen passivated Si(100)-2×1 surface is studied using ultrafast laser excitation with a nove... more A hydrogen passivated Si(100)-2×1 surface is studied using ultrafast laser excitation with a novel total internal reflection geometry. The incoherent tip and sample heating dynamics are studied, and it is shown that as long as the STM feedback is faster than the heating and cooling processes, atomic scale imaging can be achieved, even in the presence of significant tip and
A scanning tunneling microscope (STM) was used to image simultaneously the atomic lattice and the... more A scanning tunneling microscope (STM) was used to image simultaneously the atomic lattice and the charge density wave (CDW) superstructure in tantalum disulfide (1T-TaS[sub 2]) over the temperature range of 370-77K. In the lowest temperature (commensurate) phase, present below 180K, the CDW is at an angle of 13.9[degrees] relative to the lattice and is uniformly commensurate. In the incommensurate phase, present above 353K, the CDW is aligned with the lattice. 1T-TaS[sub 2] exhibits two other phases; the triclinic (T) phase which is present between 223K and 283K upon warming the sample, and the nearly-commensurate (NC) phase which is present between 353K and 180K upon cooling the sample and between 283K and 353K upon warming the sample. In both phases, discommensurate models where the CDW is arranged in small commensurate domains have been proposed. In the NC phase the CDW is rotated between 10[degrees] and 12.5[degrees] relative in the atomic lattice. Such a rotated CDW would creat...
2003 Third IEEE Conference on Nanotechnology, 2003. IEEE-NANO 2003., 2003
We have used ultrahigh vacuum scanning tunneling microscopy (UHV STM) to study single-walled carb... more We have used ultrahigh vacuum scanning tunneling microscopy (UHV STM) to study single-walled carbon nanotubes (SWNTs) supported by a hydrogen-terminated Si(100)-2×1 surface. Two distinct methods were used in the deposition of SWNTs. The first is an ex situ solution-based scheme, while the second involves direct mechanical transfer in situ. The UHV-prepared Si(100)-2×1:H surface is highly robust to ambient exposure, resulting
Nanoscale patterning of the Si(100)-2x1:H surface with the UHV-STM [1] is used to selectively mod... more Nanoscale patterning of the Si(100)-2x1:H surface with the UHV-STM [1] is used to selectively modify the Si substrate acting as a semiconducting support for isolated single-walled carbon nanotubes (SWNTs) deposited via dry contact transfer (DCT) [2]. By desorbing H at the SWNT-Si interface, we can mechanically stabilize SWNTs that initially were only weakly coupled to the Si surface and thus highly sensitive to STM tip induced perturbations. Moreover, on the degenerately doped n-type H-Si(100) surface, the presence of negatively charged Si dangling ponds patterned in close proximity to a semiconducting SWNT decreases the magnitude of the substrate voltage required for the onset of filled states conduction through the SWNT. Our results suggest new opportunities for engineering -- on the sub-nm scale -- both the mechanical and electronic properties of SWNTs integrated with semiconductor platforms. [1] J.W. Lyding et al., APL 64, 2010 (1994). [2] P.M. Albrecht and J.W. Lyding, APL 83, 5029 (2003).
... POLYMERIC MATERIALS CONSTRUCTED FROM METALLOPHTHALOCYANINES TAMOTSU INABEla, JOSEPH F. LOMAXl... more ... POLYMERIC MATERIALS CONSTRUCTED FROM METALLOPHTHALOCYANINES TAMOTSU INABEla, JOSEPH F. LOMAXla, JOSEPH W. LYDINGlb ... WJ Pietro, TJ Marks and MA Ratner, Mol. Cryst. Liq. ... PJ Nigrey, D. MacInnes, Jr., DP Nairns, AG MacDiarmid and AJ Heeger, J ...
A cryogenic UHV scanning tunneling microscope has been used to study the electron stimulated deso... more A cryogenic UHV scanning tunneling microscope has been used to study the electron stimulated desorption of hydrogen and deuterium from Si(100) surfaces at 11 K. A strong isotope effect is observed, as seen previously at room temperature. Above ∼5 eV, the desorption yields ...
An LC resonator using a superconducting MgB2 thin film was fabricated, and its quality factor was... more An LC resonator using a superconducting MgB2 thin film was fabricated, and its quality factor was measured. The LC resonator was formed by an MgB2 thin film in a loop shape and thin film capacitors having an Au/AlN/MgB2 structure. The etching process of MgB2 thin film was optimized to improve the yield of Au/AlN/MgB2 thin film capacitor. Experimental results indicate that quality factors Q=760–1570 for frequency of 560–680MHz at 4.2K. The quality factor of an MgB2 LC resonator increased with frequency. These results suggest that the MgB2 thin film is promising for microwave device applications.
Inc. The scanning tunneling microscope (STM) is a locally constructed, programmable, ultrahigh va... more Inc. The scanning tunneling microscope (STM) is a locally constructed, programmable, ultrahigh vacuum instrument for atomic level imaging and surface modi-fication. Our goal was not to control all three instruments simultaneously but rather to demonstrate that our uni-fied virtual ...
Use of single-walled carbon nanotubes (SWNTs) in industry compatible device applications requires... more Use of single-walled carbon nanotubes (SWNTs) in industry compatible device applications requires top-down control of SWNT electronic type. Therefore, we develop a technique for SWNT electronic separation, increasing the relative distribution of metallic SWNTs in solution by ...
Abstract: This program demonstrated the first compatible resonant tunneling diodes (RTD) for inte... more Abstract: This program demonstrated the first compatible resonant tunneling diodes (RTD) for integration with CMOS (complementary metal oxide semiconductor) technology and designed circuits to exploit and evaluate the speed-power advantage of integrated RTD and CMOS devices. The first Si-based resonant interband tunnel diodes were demonstrated with peak current density greater than 10 (exp 4) A/sq cm; peak-to-valley current ratio exceeding 2 was achieved at room temperature. The SiO2/Si/SiO2 RTD was studied extensively in a ...
4th IEEE Conference on Nanotechnology, 2004., 2004
A hydrogen passivated Si(100)-2×1 surface is studied using ultrafast laser excitation with a nove... more A hydrogen passivated Si(100)-2×1 surface is studied using ultrafast laser excitation with a novel total internal reflection geometry. The incoherent tip and sample heating dynamics are studied, and it is shown that as long as the STM feedback is faster than the heating and cooling processes, atomic scale imaging can be achieved, even in the presence of significant tip and
Uploads
Papers by J. Lyding