Ultrafast Tracking of Exciton and Charge Carrier Transport in Optoelectronic Materials on the Nanometer Scale

Posted by klaurent Oxford

Kavli Affiliate: Philipp Kukura | Summary:We present a novel optical transient absorption and reflection microscope based on a diffraction-limited pump pulse in combination with a wide-field probe pulse, for the spatio-temporal investigation of ultrafast population transport in thin films. The microscope achieves a temporal resolution down to 12 fs and simultaneously provides sub-10 nm spatial […]


Continue.. Ultrafast Tracking of Exciton and Charge Carrier Transport in Optoelectronic Materials on the Nanometer Scale

The Scenario Culture

Posted by klaurent Cornell

Kavli Affiliate: Daniel Ralph | First 5 Authors: Edward Wheatcroft, Henry Wynn, Chris J. Dent, Jim Q. Smith, Claire L. Copeland | Summary: Scenario Analysis is a risk assessment tool that aims to evaluate the impact of a small number of distinct plausible future scenarios. In this paper, we provide an overview of important aspects […]


Continue.. The Scenario Culture

Role of Element-Specific Damping on the Ultrafast, Helicity-Independent All-Optical Switching Dynamics in Amorphous (Gd,Tb)Co Thin Films

Posted by klaurent Cornell

Kavli Affiliate: Amal El-Ghazaly | Summary:Ultrafast control of the magnetization in ps timescales by fs laser pulses offers an attractive avenue for applications such as fast magnetic devices for logic and memory. However, ultrafast helicity-independent all-optical switching (HI-AOS) of the magnetization has thus far only been observed in Gd-based, ferrimagnetic amorphous (textita-) rare earth-transition metal […]


Continue.. Role of Element-Specific Damping on the Ultrafast, Helicity-Independent All-Optical Switching Dynamics in Amorphous (Gd,Tb)Co Thin Films

Pressure-induced superconductivity in topological type II Dirac semimetal NiTe2

Posted by klaurent Caltech

Kavli Affiliate: N. C. Yeh |Summary:Very recently, NiTe2 has been reported to be a type II Dirac semimetal with Dirac nodes near the Fermi surface. Furthermore, it is unveiled that NiTe2 presents the Hall Effect, which is ascribed to orbital magnetoresistance. The physical properties behavior of NiTe2 under high pressure attracts us. In this paper, […]


Continue.. Pressure-induced superconductivity in topological type II Dirac semimetal NiTe2

Large depth-of-field tracking of colloidal spheres in holographic microscopy by modeling the objective lens

Posted by klaurent Harvard

Kavli Affiliate: Vinothan Manoharan | First 5 Authors: Brian Leahy, Ronald Alexander, Caroline Martin, Solomon Barkley, Vinothan Manoharan | Summary: Holographic microscopy has developed into a powerful tool for 3D particle tracking, yielding nanometer-scale precision at high frame rates. However, current particle tracking algorithms ignore the effect of the microscope objective on the formation of […]


Continue.. Large depth-of-field tracking of colloidal spheres in holographic microscopy by modeling the objective lens

Observation of spin-momentum locked surface states in amorphous Bi$_2$Se$_3$

Posted by klaurent Berkeley

Kavli Affiliate: Alessandra Lanzara | Summary:Crystalline symmetries have played a central role in the identification of topological materials. The use of symmetry indicators and band representations have enabled a classification scheme for crystalline topological materials, leading to large scale topological materials discovery. In this work we address whether amorphous topological materials, which lie beyond this […]


Continue.. Observation of spin-momentum locked surface states in amorphous Bi$_2$Se$_3$

Modification of electron-phonon coupling by micromachining and suspension

Posted by klaurent Caltech

Kavli Affiliate: Michael Roukes | Summary:Weak electron-phonon interaction in metals at low temperatures forms the basis of operation for cryogenic hot-electron bolometers and calorimeters. Standard power laws, describing the heat flow in the majority of experiments, have been identified and derived theoretically. However, a full picture encompassing experimentally relevant effects such as reduced dimensionality, material […]


Continue.. Modification of electron-phonon coupling by micromachining and suspension

Anharmonicity strongly enhancing thermal interface conductance: A new anharmonic atomistic Green’s function formalism

Posted by klaurent Cornell

Kavli Affiliate: Zhiting Tian | First 5 Authors: Jinghang Dai, Jinghang Dai, , , | Summary: The traditional atomistic Green’s function (AGF) was formulated in the harmonic regime, preventing it from capturing the role of anharmonicity in interfacial thermal transport. Incorporating anharmonicity into AGF has long been desired but remains challenging. We developed a rigorous […]


Continue.. Anharmonicity strongly enhancing thermal interface conductance: A new anharmonic atomistic Green’s function formalism

High-Throughput Detection and Manipulation of Single Nitrogen-Vacancy Center’s Charge in Nanodiamonds

Posted by klaurent Oxford

Kavli Affiliate: Achillefs Kapanidis | Summary:The fluorescent nitrogen-vacancy (NV) defect in diamond has remarkable photophysical properties, including high photostability, which allows stable fluorescence emission for hours; as a result, there has been much interest in using nanodiamonds (NDs) for quantum optics and biological imaging. Such applications have been limited by the complexity and heterogeneity of […]


Continue.. High-Throughput Detection and Manipulation of Single Nitrogen-Vacancy Center’s Charge in Nanodiamonds