We describe the construction and performance of a scanning tunneling microscope capable of taking maps of the tunneling density of states with sub-atomic spatial resolution at dilution refrigerator temperatures and high (14 T) magnetic fields. The fully ultra-high vacuum system features visual access to a two-sample microscope stage at the end of a bottom-loading dilution refrigerator, which facilitates the transfer of in situ prepared tips and samples. The two-sample stage enables location of the best area of the sample under study and extends the experiment lifetime.
The successful thermal anchoring of the microscope, described in detail, is confirmed through a base temperature reading of 20 mK, along with a measured electron temperature of 250 mK. Atomically resolved images, along with complementary vibration measurements, are presented to confirm the effectiveness of the vibration isolation scheme in this instrument. Finally, we demonstrate that the microscope is capable of the same level of performance as typical machines with more modest refrigeration by measuring spectroscopic maps at base temperature both at zero field and in an applied magnetic field.
Quantum dot thermometry at ultra-low temperature in a dilution refrigerator with a 4He immersion cell
Experiments performed at a temperature of a few millikelvins require effective thermalization schemes, low-pass filtering of the measurement lines, and low-noise electronics. Here, we report on the modifications to a commercial dilution refrigerator with a base temperature of 3.5 mK that enable us to lower the electron temperature to 6.7 mK measured from the Coulomb peak width of a quantum dot gate-defined in an [Al]GaAs heteostructure. We present the design and implementation of a liquid 4He immersion cell tight against superleaks, implement an innovative wiring technology, and develop optimized transport measurement procedures.
Traceable Ultra Refrigerator/Freezer Thermometers with Calibration
- Includes NIST-Traceable certificate from our A2LA accredited (1750.01) calibration laboratory│Triple display simultaneously shows MIN/MAX and current temperature│10-ft microcable allows refrigerator/freezer doors to close on it
Traceable Products have an individually-numbered Traceable Certificate provided with each unit, that assures accuracy from our ISO/IEC 17025:2017(1750.01) calibration laboratory accredited by A2LA. It indicates traceability of measurements to the SI units through NIST or other recognized national measurement institutes (NMI) that are signatories to the CIPM Mutual Recognition Agreement. Each product goes through an intense vetting process before it can carry the Traceable name, thus saving you both time and money by not having to calibrate separately.
Specifications & Description
- Meter Measurement TypeDigital Indicator
- Number Of Probe Channels1
- Types Of Probes Accepted1 bottle and 1 Bullet probes
- Min Temperature (° F)-58
- Max Temperature (° F)158
- Min Temperature (° C)-50
- Max Temperature (° C)70
- Accuracy±0.5°C (-30 to 50°C); otherwise ±1°C
- Resolution0.1°
- AlarmYes
- Min/Max FunctionYes
- Low Battery IndicatorYes
- Display TypeLCD
- Height (in)4 1/4
- Width (in)2 3/4
- Depth (in)3/4
- No. of Probe(s) Included1
- Cable Length (in)120
- BatteryAAA Battery (2)
- DescriptionTraceable Ultra Refrigerator/Freezer Thermometer with Calibration; 1 Bottle and 1 Bullet Probes
ExoELISA-ULTRA Complete Kit (CD63 detection) |
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EXEL-ULTRA-CD63-1 | SBI | 96 reactions | 713 EUR |
ExoELISA-ULTRA Complete Kit (CD81 detection) |
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EXEL-ULTRA-CD81-1 | SBI | 96 reactions | 713 EUR |
scanning thermometer |
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T8710 | Consort | ea | 1282 EUR |
scanning thermometer |
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T8720 | Consort | ea | 1282 EUR |
Multi-Colored Traceable Timer |
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LE9002 | GenDepot | Ea | 88 EUR |
scanning thermometer ch plug |
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T8710-CH | Consort | ea | 1282 EUR |
scanning thermometer uk plug |
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T8710-UK | Consort | ea | 1282 EUR |
scanning thermometer ch plug |
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T8720-CH | Consort | ea | 1282 EUR |
scanning thermometer uk plug |
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T8720-UK | Consort | ea | 1282 EUR |
Water-Resistant, Traceable Flashing Timer |
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LE9004 | GenDepot | Ea | 80 EUR |
thermometer probe pt100, 20m cable |
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T4420 | Consort | ea | 154 EUR |
Traceable® Three-Line Alarm Timer |
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LE9003 | GenDepot | Ea | 107 EUR |
thermometer probe pt100, 15cm, 20m cable |
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T4421 | Consort | ea | 183 EUR |
thermometer probe pt100 ht, 2m cable |
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T4422 | Consort | ea | 247 EUR |
4L Ecoscint Ultra |
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NAT1388 | National Diagnostics | 4L | 237 EUR |
20L Ecoscint Ultra |
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NAT1390 | National Diagnostics | 20L | 946 EUR |
CHAPS, Ultra Pure |
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C0660-005 | GenDepot | 5g | 165 EUR |
CHAPS, Ultra Pure |
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C0660-010 | GenDepot | 10g | 253 EUR |
CHAPSO, ultra Pure |
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C0661-001 | GenDepot | 1g | 165 EUR |
Agarose Ultra Pure |
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BA01101 | Bioatlas | 100g | 123 EUR |
Agarose Ultra Pure |
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BA01102 | Bioatlas | 500g | 333 EUR |
CHAPS, Ultra Pure |
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22024-100G | Biotium | 100G | 584 EUR |
CHAPS, Ultra Pure |
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22024-10G | Biotium | 10G | 136 EUR |
Traceable® Four-Channel Alarm Timer with Clock |
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LE9001 | GenDepot | Ea | 93 EUR |
100-Well Polycarbonate Freezer Boxes, 1" |
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LC3011-012 | GenDepot | 12/CS | 246 EUR |
100-Well Polycarbonate Freezer Boxes, 2" |
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LC3012-012 | GenDepot | 12/CS | 253 EUR |
EpiQuik MeDIP Ultra Kit |
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P-1052 | EpiGentek | 48 Reactions | 1005.55 EUR |
DTT, Ultra Pure, 15g |
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R7634-15g | ACTGene | 190 EUR | |
DTT, Ultra Purer, 500g |
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R7634-500g | ACTGene | 2846 EUR | |
DTT, Ultra Pure, 50g |
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R7634-50g | ACTGene | 443 EUR | |
EDTA, Ultra Pure, 1kg |
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R9410-1kg | ACTGene | 190 EUR | |
Tris - Ultra Pure Grade |
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TB0194 | Bio Basic | 500g | 74.36 EUR |
SDS, 99% Ultra Pure |
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S0800-100 | GenDepot | 1Kg | 313 EUR |
SDS, 99% Ultra Pure |
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S0800-250 | GenDepot | 2.5 Kg | 536 EUR |
SDS, 99% Ultra Pure |
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S0800-500 | GenDepot | 5 Kg | 955 EUR |