Rotational cavity optomechanics

We theoretically examine the optomechanical interaction between a rotating nanoparticle and an orbital angular momentum-carrying optical cavity mode. Specifically, we consider a dielectric nanosphere rotating uniformly in a ring-shaped optical potential inside a Fabry-Perot resonator. The motion of the particle is probed by a weak angular lattice, created by introducing two additional degenerate Laguerre-Gaussian cavity modes carrying equal and opposite orbital angular momenta. We demonstrate that the rotation frequency of the nanoparticle is imprinted on the probe optical mode, via the Doppler shift, and thus may be sensed experimentally using homodyne detection. We show analytically that the effect of the optical probe on the particle rotation vanishes in the regime of linear response, resulting in an accurate frequency measurement. We also numerically characterize the degradation of the measurement accuracy when the system is driven in the nonlinear regime. Our results are relevant to rotational Doppler velocimetry and to studies of rotational Brownian motion in a periodic lattice.Comment: 7 pages, 2 figures, to appear in JOSA

Options for Human Capital Acquisition

An \u27options\u27 view of human capital acquisition explains value creation through timedeferred, sequential, path-dependent investment choices and addresses gaps in the resourcebased theory explanation of the relationship between human resources and competitive advantage. Firms will invest in options for human capital, using alternative employment arrangements like temporary/contractual/part-time workers and internships, or by outsourcing the work, when uncertainty associated with human capital is high and investments in human capital are largely irreversible. We discuss various options for skills and employees, two interrelated components of human capital. These are flexibility options, options to wait or defer, options to abandon, learning options, and switching options. The opportunity cost of not having options is quantifiable, which makes the real options approach valuable for strategic HRM decisions

Recognizing Risk in Human Capital Investments: A Real Options Approach to Strategic Human Resource Management

An issue that has not yet been explored in the field of strategic human resource management (SHRM) is that of managing the ‘risks’ involved in human capital management of the firm. We address this issue using the real option theory framework. We argue that certain HR practices manage risk and generate opportunities for the firm by creating \u27options\u27 for its human capital management. These HR options help ensure stability of returns from human capital and thus sustain competitive advantage. Different types of HR options and the role of certain HR practices in creation of these options are discussed

Analytical study of level crossings in the Stark-Zeeman spectrum of ground state OH

The ground electronic, vibrational and rotational state of the OH molecule is currently of interest as it can be manipulated by electric and magnetic fields for experimental studies in ultracold chemistry and quantum degeneracy. Based on our recent exact solution of the corresponding effective Stark-Zeeman Hamiltonian, we present an analytical study of the crossings and avoided crossings in the spectrum. These features are relevant to non-adiabatic transitions, conical intersections and Berry phases. Specifically, for an avoided crossing employed in the evaporative cooling of OH, we compare our exact results to those derived earlier from perturbation theory.Comment: 5 figures, to be published in Eur. Phys. J.