0:00:04this to be used giving a short introduction to the paper examining the ionisation process
0:00:08going on during elimination of nitrogen vacancy defect indictment
0:00:12indeed effect and diamond is a single foot an amateur it gives that's fluorescence emission
0:00:17which can be detected the confocal microscope at room temperature
0:00:21indeed effect contains an election spin and a new peers been yet occurrence been can
0:00:26be initialize and read out optically
0:00:29these properties especially the long coherence times makes the envy defect a candidate for the
0:00:34application of a quantum register
0:00:37furthermore it has been demonstrated that the envied effect can serve as a magnetic and
0:00:41electric field sensor
0:00:44all these applications are based on the negatively charged envied effect
0:00:48but there is also another charge state of envy
0:00:50if one electron is removed we get the neutrally charged and we center
0:00:54this chart state is actually a part of the process but hidden
0:00:59by illumination with highly the power the charts data switching at a very fast rate
0:01:07these ionisation and recombination processes can be slow down by changing the excitation wavelength and
0:01:13lowering the intensity
0:01:16the time traits shows the blinking between chart states on a time scale of seconds
0:01:22that's have a closer look on the time trace
0:01:25we have single burst that can be assigned to a chart state
0:01:29that i've ever since level we are in the new minus state the low fluorescence
0:01:33level belongs to the n b zero state
0:01:37the time the envy defect resides in the any minus and then be zero state
0:01:41can be determined by analysing the time tries
0:01:45furthermore defer sense level gives us direct information about and b minus absorption
0:01:51the probability to be in your mind as they can be determined but it opens
0:01:55as shown in the formula
0:01:58we examine to dependence of these processes on the excitation wavelength and power
0:02:05in the graph you can see d n b minus probability plotted versus the excitation
0:02:10wavelength
0:02:11for broad range of excitation wavelengths and maximum and b minus probability of seventy percent
0:02:15can be observed
0:02:19in addition to this we succeeded in measuring the intrinsic absorption spectra from be minus
0:02:27the results help us an understanding how the chart state switching is working
0:02:32the ionisation from n b minus trained with zero functions as a twofold and process
0:02:36for a broad range of excitation wavelengths
0:02:41a first photonic sides and b minus
0:02:44a second photo lifts the electron into the conduction bent
0:02:48consequently in be minus has been ionised and we end up in the n b
0:02:52zero state
0:02:54recombination works accordingly
0:02:57a first photo excites and v zero and the second courses to capture of an
0:03:02electron ending up in the n b minus crone state
0:03:07if it to foreign process can cause the ionisation with higher for to manage it
0:03:11should also be possible to ionised in be detected only one photon
0:03:15this is exactly what we have observed
0:03:18liu illumination excites an electron from the ground state directly into the conduction band
0:03:24the recombination process is also possible with one photon
0:03:32the thing that charge state detection method enabled us to determine the exact energetic localisation
0:03:37of n b minus crone stayed within the band k
0:03:41the results of this paper are important for the implementation of high resolution microscopy techniques
0:03:46that are based on stochastic blinking
0:03:49multiple in v centres in a diffraction limited area cannot be resolved because they're all
0:03:54the meeting photons at a time
0:03:56a switching of charge states allows us to localise envied effects be on t diffraction
0:04:00blurring
0:04:04furthermore the charts the detection method can be used to initialize the chart state with
0:04:08fidelity of almost hundred percent
0:04:11in the future d measurement of charge state dynamics of envy centres of make it
0:04:15possible to send surrounding charts concentration since it influences defame eleven endowment