Monday, April 25, 2016

Friday, April 15, 2016

arXiv week + extra

arXiv week


Non-Equilibrium Thermodynamics of HarmonicallyTrapped Bosons
 -> Loschmidt Echo

Present on optical lattice (+ Spatz article) and eventuaally on spontaneous emission


Digital quantum simulation of many-body non-Markovian dynamics


Stat./Thermo Q. / time of arrival via spontaneous decay (Ruschhaupt) / dissipative process / emergence of "relativistic" properties

Time operator,  Zhi-Yong Wang


Squeezed light 

Remarks concerning the status and some ramifications of EHRENFEST’S THEOREM

Friday, June 5, 2015

Ultracold atoms in optical lattices

Ultracold atoms in optical lattices:

Ultracold fermions in a honeycomb optical lattice:

Identifying topological edge states in 2D optical lattices using light scattering:

Artificial Gauge Fields and Spin-Orbit Couplings in Cold Atom Systems:

Tuesday, March 31, 2015

My Favourite things (in no particular order)

Noncommutative geometry for three-dimensional topological insulators:
Curved spacetimes in the lab:
Relativistic Bose–Einstein condensates: a new system for analogue models of gravity:
Surprising Connections Between General Relativity and Condensed Matter:
Casimir effect, gravitation and superconductors:

Condensed Matter Physics and the Nature of Spacetime:
Ultracold fermions in a honeycomb optical lattice:
How to understand the emergent special relativity in the superfluid?

QURELSIM (Quantum Simulations of Relativistic Systems):

A relativistic optical-data model for inelastic scattering of electrons and positrons in condensed matter:

Gauge Dynamics and Topological Insulators:

Massless and Massive Electrons: Relativistic Physics in Condensed Matter Systems:

Dirac Equation For Cold Atoms In Artificial Curved Spacetimes:

Dirac Fermions in Solids — from High Tc cuprates and Graphene to Topological Insulators and Weyl Semimetals.:

Relativistic quantum effects of Dirac particles simulated by ultracold atoms:

Relativistic dynamics and Dirac particles in graphene (Nan Gu's PhD thesis, 2011)

Spontaneous Symmetry Breaking and Nambu–Goldstone Bosons in Quantum Many-Body Systems:

Fundamental quantum optics experiments conceivable with satellites reaching relativistic distances and velocities:

Tale top particle physics with graphene:

Lectures on holographic methods for condensed matter physics:

Holographic interaction effects on transport in Dirac semimetals:

Spin-liquid phase and order-by-disorder of classical Heisenberg spins on the swedenborgite lattice:

Sunday, February 8, 2015

Broadcom BCM4313 802.11bgn WPA2 on Linux (Ubuntu 14.01 LTS)

Open source beats proprietary software, that's what's happening now. Ubuntu thinks to make a favour to their users by blacklisting the FLOSS b43 driver and installing Broadcomm's wl, perhaps believing that things might work more smoothly. Well, that's not true: for example WPA2 doesn't work.

This is what I did to make it work.

I basically deleted (or moved somewhere else) the blacklist file /etc/modprobe.d/blacklist-bcm43.conf.

Then I uninstalled the Broadcomm dritver:

apt-get purge bcmwl-kernel-source

I also commented out the relevant line in /etc/udev/rules.d/70-persistent-net.rules.

Okay, maybe you still need the proprietary firmware, b43-fwcutter or something like that, but it's at least good news that now everything works fine (after just a reboot) and I can use any modern Wi-Fi network.

I'm not sure all of the above is necessary. Certainly b43 works better than wl, as far as I can tell. Certainly Ubuntu does a great effort in tweaking GNU/Linux to give their users a better experience, but sometimes it's more of a problem than a solution. Perhaps it's just time to relax: the regular Linux drivers (the ones that the kernel or udev would automatically load by default), well, they... just work.

Note: in case you wonder:

# lspci -n
02:00.0 0280: 14e4:4727 (rev 01)

Sunday, March 23, 2014

Stop copy-pasting!

ssh user@machine sh -c 'cat >> ~/.ssh/authorized_keys' < ~/.ssh/

When you SSH into Linux from Windows/MSYS

Add the following to your .profile (works with BASH).

if [ "$TERM" = "msys" ]
        export TERM=cygwin
Otherwise, vim, less, man, mc... won't work as expected.