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Local resilience of the 1T-TiSe2 charge density wave to Ti self-doping

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Single-Molecule Vibrational Spectroscopy of H2O on Anatase TiO2(101)

Klaus Kern, Christian Alexander Stephan Dette, Feliciano Giustino, Shai Mangel

Atomic level understanding of water on titanium dioxide (TiO2), in particular the mineral form anatase, is exceptionally important, considering its practical applications including photocatalytic water-splitting, photoinduced hydrophilicity , and water pur ...

American Chemical Society2017

Dual-pump generation of high-coherence primary Kerr combs with multiple sub-lines

Tobias Kippenberg, Maxim Karpov, Martin Hubert Peter Pfeiffer, Arne Kordts, Yan Yan, Long Li, Lin Zhang, Amirhossein Mohajerin Ariaei

We experimentally generate high-coherence primary Kerr combs with multiple sub-lines by using dual pumps and demonstrate the application of a primary comb state in multichannel communications. We find that more than 10 primary comb lines can be generated w ...

Optical Society of America2017

Short-range phase coherence and origin of the 1T-TiSe2 charge density wave

Helmuth Berger, Elia Razzoli, Philipp Aebi

The impact of variable Ti self-doping on the 1T-TiSe2 charge density wave (CDW) is studied by scanning tunneling microscopy. Supported by density functional theory, we show that agglomeration of intercalated-Ti atoms acts as preferential nucleation centers ...

Amer Physical Soc2016

Localized electronic states at grain boundaries on the surface of graphene and graphite

Oleg Yazyev, Gabriel Albert Autes

Recent advances in large-scale synthesis of graphene and other 2D materials have underscored the importance of local defects such as dislocations and grain boundaries (GBs), and especially their tendency to alter the electronic properties of the material. ...

Iop Publishing Ltd2016

Recent experimental advances in atomically thin transition metal dichalcogenide (TMD) metals have unveiled a range of interesting phenomena including the coexistence of charge-density-wave (CDW) order and superconductivity down to the monolayer limit. The ...

Amer Physical Soc2016

Atomic Scale Observation of Chemical and Electronic Properties of Metal-Oxide Surfaces

Christian Alexander Stephan Dette

To meet the future global energy demand - an estimated additional 10 terawatts (TWs) per year in 2050 - a diversification of energy sources and fuels is needed. Solar energy represents a prominent alternative energy source. An important material for these ...

EPFL2016

Scanning tunneling microscopy of the charge density wave in 1T-TiSe2 in the presence of single atom defects

Helmuth Berger, Philipp Aebi

We present a detailed low-temperature scanning tunneling microscopy (STM) study of the commensurate charge density wave (CDW) in 1T-TiSe2 in the presence of single atom defects. We find no significant modification of the CDW lattice in single crystals with ...

Amer Physical Soc2015

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Electrical impedance spectroscopy measurements were performed in post-mortem mice brains using a flexible probe with an embedded micrometric electrode array. Combined with a peak resistance frequency method this allowed obtaining intrinsic resistivity valu ...

Elsevier2014

Competing charge, spin, and superconducting orders in underdoped YBa2Cu3Oy

Johan Juul Chang

To explore the doping dependence of the recently discovered charge-density-wave (CDW) order in YBa2Cu3Oy, we present a bulk-sensitive high-energy x-ray study for several oxygen concentrations, including strongly underdoped YBa2Cu3O6.44. Combined with previ ...

Amer Physical Soc2014

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We show a technique that images the intensity distribution and local state of polarization of the optical field of high-quality factor optical modes confined in dielectric planar photonic crystal nanocavities. Based on energy-loss spectroscopy of swift ele ...

Amer Physical Soc2013